| Model Number | Service Note Type | Service Note Number | Service Note Description | Date |
| 175A | Modification Recommended | 175A-1A | SWEEP AND GATE OUTPUT MODIFICATION KIT; HP Stock No. 175A-95A | 1963-04 |
| 175A | Modification Recommended | 175A-2A | Serials Below 326-01376 - Thermal Switch Assembly Modification Kit – hp Stock NO. 175A-95E | 1986-01 |
| 175A | Modification Recommended | 175A-5 | Serials Below 413-02326 – Modification of 175A for 1784A Recorder Plug-in | 1965-04 |
| 175A | Modification Recommended | 175A-6 | Serial Prefix Below 450- New Vertical Output Printed Circuit Board 175A-65W | 1965-04 |
| 175A | Modification Recommended | 175A-7 | All Serials – Improved Sweep Operation | 1965-04 |
| 175A | Modification Recommended | 175A-8 | Serial Prefixes Below 436- INCREASED VERTICAL DC STABILITY | 1965-07 |
| 175A | Modification Recommended | 175A-9 | All Serials – Improved Trigger Circuit Stability | 1965-10 |
| 175A | Modification Recommended | 175A-10 | Serials Prefixed Below 326- Fan Filter Replacement Kit 00175-69501 | 1965-10 |
| 175A | Modification Recommended | 175A-11 | Serials Below 530-04101 – IMPROVED HIGH FREQUENCY TRIGGERING | 1965-12 |
| 175A | Modification Recommended | 175A-12 | Serial Prefix 530- and Below - Improved Complex Waveform Triggering – Parts Kit # 00175-69502 | 1966-03 |
| 175A | Modification Recommended | 175A-14 | Serial Numbers 633-04850 and Below - Improved Triggering Stability | 1966-11 |
| 175A | Modification Recommended | 175A-15 | Serial No. 633-06036 and Below - Thermal Switch Assembly Modification Kit – hp Stock NO. 175A-95F | 1968-01 |
| 202B | Modification Recommended | 202B-1 | PROCEDURE FOR REPLACING MECHANICAL DRIVE CABLES ON MODEL 202B | 1954.07.28 |
| 211A | Modification Recommended | 211A-1A | Serial No. 1463 and Below - REPLACEMENT FAN KIT hp STOCK NO. 211A-95A | 1965-12 |
| 330B | Modification Recommended | 330B-3E | MODELS 330B, 330C, & 330D DISTORTION ANALYZERS TEST PROCEDURE | unknown |
| 346C | Modification Recommended | 346C-02 | Mod eliminates 425MHz spurious oscillations | 1994.05.26 |
| 382A | Modification Recommended | 382A-1A | MODELS G382A, C382A, J382A, H382A, X382A AND P382A - BROADBAND PRECISION WAVEGUIDE VARIABLE ATTENUATOR – CALIBRATION AND ALIGNMENT PROCEDLTRES | unknown |
| 400D | Modification Recommended | 400D-2C | MODELS 400D, 400H, AND 400L VACUUM TUBE VOLTMETERS - TEST, ADJUSTMENT, AND CERTIFICATION METHODS | 1965-06 |
| 400D | Modification Recommended | 400D-4B | MODEL 400D/H VACUUM TUBE VOLTMETERS - 400D serial 17970 and below, 400H serial 2237 and below - REDUCTION OF RESIDUAL NOISE MODIFICATION KIT - HP STOCK NO. 400D-95B | 1968-06 |
| 410C | Safety | 410C-14A-S | ELIMINATION OF A POTENTIAL SAFETY HAZARD | 1976-01 |
| 412A | Modification Recommended | 412A-2A | REPLACEMENT OF RANGE SWITCH ASSEMBLY – STOCK NO. 412A-19W | unknown |
| 412A | Modification Recommended | 412A-4 | SERIAL 004-03632 AND BELOW – BIAS CIRCUIT IMPROVEMENTS | unknown |
| 412A | Modification Recommended | 412A-5 | SERIALS 134-07482 AND BELOW - INPUT CABLE MODIFICATION KIT – HP STOCK NO. 412A-95B | 1963-06 |
| 412A | Modification Recommended | 412A-6 | RANGE SWITCH MAINTENANCE | 1964-08 |
| 412A | Modification Recommended | 412A-7 | REPLACEABLE PARTS FOR VOLTAGE PROBE ASSEMBLY | 1964-12 |
| 412A | Modification Recommended | 412A-8 | Serials 134-07482 and Below - INPUT CABLE MODIFICATION KIT, HP PART NO. 00412-69501 | 1965-01 |
| 412A/AR | Various | 00412-90001 | 412A/AR DC Vacuum Tube Voltmeter Service Notes Collection | 1969-08 |
| 412AR | Modification Recommended | 412AR-2 | SERIAL 134-05282 AND BELOW – IMPROVED GROUND CONNECTION | unknown |
| 416A | Modification Recommended | 416A-2A | SERIALS PREFIXED 002- & BELOW - REPLACEMENT OF CONTROL TUBE V2 FOR INCREASED STABILITY | unknown |
| 432A | Information Only | 432A-1 | An Alternate Method to Calibrate the 432A | 1968-11 |
| 438A | Modification Recommended | 438A-13 | Modification to Eliminate Measurement Instability | 1996-01 |
| 438A | Modification Recommended | 438A-14A | Modification to Eliminate Loose Reference Oscillator N-type connectors | 1997-07 |
| 523DR | Modification Recommended | 523DR-2 | SERIAL NO. 010-00425 AND BELOW – CONNECTIONS FOR STANDBY OPERATION OF CRYSTAL OVEN | unknown |
| 523DR | Modification Recommended | 523DR-3A | SERIALS BELOW 826 – TRIGGER UNIT MODIFICATION | unknown |
| 608A | Modification Recommended | P-608A-34 | Replacement Attenuator Assembly | 1969-02 |
| 608B | Modification Recommended | P-608A-34 | Replacement Attenuator Assembly | 1969-02 |
| 608C | Modification Recommended | 608C-2 | Modification for Regulated DC Filament Operation | 1957-01 |
| 608C | Modification Recommended | P-608A-34 | Replacement Attenuator Assembly | 1969-02 |
| 608D | Modification Recommended | P-608A-34 | Replacement Attenuator Assembly | 1969-02 |
| 608E | Modification Recommended | P-608A-34 | Replacement Attenuator Assembly | 1969-02 |
| 608F | Modification Recommended | P-608A-34 | Replacement Attenuator Assembly | 1969-02 |
| 1146B | Modification Recommended | 1146B-01 | All units expected to fail BW measurement accuracy at DC- 100 KHz -3dB spec. Those units having + gain @ at 0.22 dB or @ 15% higher than upper spec (0 dB). | 2015.04.30 |
| 1156A | Modification Recommended | 1156A-01 | This product 1156A was scheduled to go End of Support in Sept 2016, but to circumstances that were out of Keysight Technologies control we were forced to End Service life prematurely. | 2016.06.09 |
| 1157A | Modification Recommended | 1157A-01 | This product 1157A was scheduled to go End of Support in Sept 2019, but to circumstances that were out of Keysight Technologies control we were forced to End Service life prematurely. | 2016.06.09 |
| 1158A | Modification Recommended | 1158A-02 | This product 1158A was scheduled to go End of Support in Sept 2019, but to circumstances that were out of Keysight Technologies control we were forced to End Service life prematurely. | 2016.06.09 |
| 1310B | Modification Recommended | 1310B-1 | ARCING/BREAKDOWN OF PA CONNECTOR | 1981-11 |
| 1332A | Modification Recommended | 1332A-1 | Possible Lack of Sufficient Range of Intensity Limit Adjustment if CRT is Replaced | 1975-03 |
| 1332A | Modification Recommended | 1332A-2 | Preferred parts replacement for resistors A1R86 and A1R87 used with Model 1332A Option 216 | 1975-06 |
| 1332A | Modification Recommended | 1332A-5 | IMPROVED RELIABILITY FOR TilE Z-AXIS AMPLIFIER | 1977-04 |
| 1333A | Modification Recommended | 1333A-1 | IMPROVED RELIABILITY FOR THE Z-AXIS AMPLIFIER | 1977-04 |
| 1335A | Modification Recommended | 1335A-2 | Improved Storage Circuitry Reliability | 1977-04 |
| 1335A | Modification Recommended | 1335A-3 | Improved Reliability For The Z-Axis Amplifier | 1977-04 |
| 1660A | Priority Safety | 1660A-02-S | Potentially defective line filter may cause shock hazard | 1996.03.14 |
| 1660AS | Priority Safety | 1660AS-02-S | Potentially defective line filter may cause shock hazard | 1996.03.14 |
| 1660C | Safety | 1660C-01-S | Potentially defective line filter may cause shock hazard | 1996.03.14 |
| 1660CS | Safety | 1660CS-01-S | Potentially defective line filter may cause shock hazard | 1996.03.14 |
| 1660CS | Modification Available | 1660CS-03A | Error in the Threshold Accuracy Test | 2002.05.29 |
| 1661A | Priority Safety | 1661A-02-S | Potentially defective line filter may cause shock hazard | 1996.03.14 |
| 1661AS | Safety | 1661AS-02-S | Potentially defective line filter may cause shock hazard | 1996.03.14 |
| 1661C | Safety | 1661C-01-S | Potentially defective line filter may cause shock hazard | 1996.01.31 |
| 1661CS | Safety | 1661CS-01-S | Potentially defective line filter may cause shock hazard | 1996.01.31 |
| 1662A | Modification Recommended | 1662A-1 | Correct Software Error/Flash ROM Failure | 1994-10 |
| 1662A | Safety | 1662A-02-S | Potentially defective line filter may cause shock hazard | 1996.01.31 |
| 1662AS | Safety | 1662AS-02-S | Potentially defective line filter may cause shock hazard | 1996.01.31 |
| 1662C | Safety | 1662C-01-S | Potentially defective line filter may cause shock hazard | 1996.01.31 |
| 1662CS | Safety | 1662CS-01-S | Potentially defective line filter may cause shock hazard | 1996.01.31 |
| 1663A | Priority Safety | 1663A-02-S | Potentially defective line filter may cause shock hazard | 1996.03.14 |
| 1663AS | Safety | 1663AS-02-S | Potentially defective line filter may cause shock hazard | 1996.01.31 |
| 1663C | Priority Safety | 1663C-01-S | Potentially defective line filter may cause shock hazard | 1996.01.31 |
| 1663CS | Safety | 1663CS-01-S | Potentially defective line filter may cause shock hazard | 1996.01.31 |
| 1664A | Safety | 1664A-01-S | Potentially defective line filter may cause shock hazard | 1996.01.31 |
| 1670A | Safety | 1670A-01-S | Potentially defective line filter may cause shock hazard | 1996.01.31 |
| 1671A | Safety | 1671A-01-S | Potentially defective line filter may cause shock hazard | 1996.01.31 |
| 1672A | Safety | 1672A-01-S | Potentially defective line filter may cause shock hazard | 1996.01.31 |
| 1680AD | Modification Available | 1680AD-01 | Japanese Help System now available. | 2002.02.26 |
| 1690A | Modification Available | 1690A-01 | Japanese Help System now available. | 2002.02.26 |
| 1690AD | Modification Available | 1690AD-01 | Japanese Help System now available. | 2002.02.26 |
| 1710A | Modification Recommended | 1710A-1 | Vertical Amplifier Protection Modification | 1973-11 |
| 1710A | Modification Recommended | 1710A-2 | CRT Burn Protection Modification | 1974-01 |
| 1710A | Modification Recommended | 1710A-3 | Modification to change Synchronized Chop Mode to a Free-running Chop Mode | 1974-03 |
| 1710A | Modification Recommended | 1710A-4 | Probe Power Modification | 1974-04 |
| 1730B | Modification Recommended | 1730B-01 | System may hang or crash reporting an error with port 3. | 2003.08.21 |
| 1750B | Modification Recommended | 1750B-1 | Serials Below 435-00176 – Increased Frequency Response | 1965-04 |
| 1750B | Modification Recommended | 1750B-2 | Serials Below 543-00616 - Improved B Trigger Out; Parts Kit 01750-69501 | 1965-11 |
| 1750B | Modification Recommended | 1750B-3 | Serials Beginning with 516-00426 – Selected Transistor Replacement for Optimum Pulse Response | 1965-10 |
| 1750B | Modification Recommended | 1750B-4 | Serial Prefixes Below 516- Improved DC Balance; Parts Kit #01750-69502 | 1965-11 |
| 1781B | Modification Recommended | 1781B-1 | Serials below 415-01026 - INCREASED MIXED SWEEP STABILITY | 1964-07 |
| 1980A/B | Modification Recommended | 1980A-2 | All Serial Prefixes – PROPER LINE FUSING | 1980-10 |
| 1980A/B | Modification Recommended | 1980B-5 | Serials Prefixed 2131A-and Below - HP-IB TALK/LISTEN AND ROM REPLACEMENT | 1981-08 |
| 1980A/B | Modification Recommended | 1980B-5A | Serials Prefixed 2131A-and Below - HP-IB TALK/LISTEN AND ROM REPLACEMENT | 1981-11 |
| 1980A/B | Modification Recommended | 1980B-6 | Serials Prefixed 2131A-and Below – REPLACEMENT OPERATING ROMs | 1981-08 |
| 1980A/B | Modification Recommended | 1980B-7 | Serials Prefixed 2131A-and Below OPERATING/PROGRAMMING COMPATIBILITY (between different vintage Instruments) | 1981-08 |
| 3235E | Modification Recommended | 3235E-16A | Recommended AC switch replacement eliminates intermittent failures | 1992.08.31 |
| 3235E | Modification Recommended | 3235E-15 | Procedure replaces weak links on mass quick interconnect mechanism | 1992.02.29 |
| 3456A | Modification Available | 3456A-13A | MODIFICATION FOR DIGITAL CIRCUITRY ENHANCEMENT | 1988-03 |
| 3456A | Modification Available | 3456A-14A | ENHANCING ANALOG CIRCUITRY | 1988-03 |
| 3456A | Modification Available | 3456A-15B | ENHANCEMENT OF MAIN CONTROLLER BOARD (A4) | 1988-06 |
| 3456A | Safety | 3456A-24A-S | Exposed high voltage potentials when servicing 3456A | 1991.11.21 |
| 3458A | Modification Recommended | 3458A-01C | A/D linearity improvement. | 2002.04.08 |
| 3458A | Information Only | 3458A-04A | Apparent failure at turn-on or when given a “RESET” command | 2002.04.09 |
| 3458A | Modification Recommended | 3458A-06A | Modification to fix Hardware error ""ac offset dac 10mV invalid cal value: 184"". | 2002.04.08 |
| 3458A | Modification Recommended | 3458A-07B | Modification to fix intermittent error ""Multislope Rundown Conversion"". | 2002.04.09 |
| 3458A | Information Only | 3458A-08A | Incorrectly Labeled Line Voltage Switches May Cause Switch Setting Confusion | 2002.04.10 |
| 3458A | Information Only | 3458A-10A | 3458A Documentation Available As “On-Line” Files | 2002.04.10 |
| 3458A | Modification Available | 3458A-11A | Reduction of ac noise when measuring ACV and using twisted shielded pair cables. | 2002.04.09 |
| 3458A | Modification Available | 3458A-12B | Outguard Firmware Upgrade: Enhancements, Fixes, & Changes (Rev. 8) | 2002.04.11 |
| 3458A | Modification Available | 3458A-12C | Outguard Firmware Upgrade: Enhancements, Fixes, & Changes (Rev. 9) | 2010.12.12 |
| 3458A | Modification Recommended | 3458A-13A | GPIB communication failures using the 3458A. | 2002.04.10 |
| 3458A | Information Only | 3458A-14B | Calibration Error After Power “On” or After an “ACAL” | 2002.05.20 |
| 3458A | Information Only | 3458A-15C | CAL RAM Battery Preventative Maintenance for the Outguard Controller (A5) Assembly | 2006.10.20 |
| 3458A | Information Only | 3458A-15D | CAL RAM Battery Preventative Maintenance for the Outguard Controller (A5) Assembly | 2010.03.12 |
| 3458A | Information Only | 3458A-16 | The original 3458A fan filter (3150-0300) is no longer available. The replacement fan filter uses three unique parts. | 2002.11.07 |
| 3458A | Information Only | 3458A-17 | Errors May Occur if ACAL AC is Initiated From the 4-Wire Ohms Function | 2004.11.17 |
| 3458A | Modification Recommended | 3458A-18A | Time Drift issues | 2007.02.12 |
| 3458A | Information Only | 3458A-19A | The original 3458A A5 (PC Assy-Outgard Controller) is no longer available. The replacement kit consists of two unique parts and an installation note. | 2007.04.10 |
| 3458A | Modification Recommended | 3458A-20 | Bad SRAM causing Cal Ram batteries to fail prematurely | 2008.12.03 |
| 3499A | Modification Recommended | 3499A-01 | DC power wire replacement to lessen noise level | 2000.11.07 |
| 3499A | Modification Recommended | 3499A-02 | Heavy inductive load may cause display to go dark or freeze up | 2000.11.07 |
| 3499A | Modification Recommended | 3499A-03B | No display or blinking after turn on. Battery leakage | 2001.05.29 |
| 3499A | Modification Recommended | 3499A-05B | Blinking or a dark display due to a defect in the battery back-up circuit | 2002.09.04 |
| 3499B | Modification Recommended | 3499B-01 | DC power wire replacement to lessen noise level | 2000.11.07 |
| 3499B | Modification Recommended | 3499B-02 | Heavy inductive load may cause display to go dark or freeze up | 2000.11.07 |
| 3499B | Modification Recommended | 3499B-03B | No display or blinking after turn on. Battery leakage | 2001.05.29 |
| 3499B | Modification Recommended | 3499B-05B | Blinking or a dark display due to a defect in the battery back-up circuit | 2002.09.04 |
| 3582A | Modification Available | 3582A-16 | Modification to A13 Rev. D board for use in older 3582As | 1991.12.12 |
| 3582A | Modification Available | 3582A-17 | Modification to A13 Rev. D board for use in older 3582As | 1992.04.09 |
| 3582A | Modification Available | 3582A-18 | Modification to prevent A1K6 input relay from welding shut | 1993.02.20 |
| 3785A | Modification Available | 3785A-25 | Mod ensures conformance to performance test | 1993.05.31 |
| 3787B | Modification Available | 3787B-12 | Instructions on retrofitting Opt 003 (voice channel output) | 1992.04.30 |
| 3789B | Modification Available | 3789B-02A | Retrofitting options 002 (2nd measu) and 003 (2nd measu & DS3 jitter measu) | 1992.04.30 |
| 3789B | Modification Available | 3789B-04B | Modification eliminates noise from HP 3789B input port | 1994.08.04 |
| 4062C | Modification Recommended | 4062C-05 | Recommended replacement of incorrect AC line breaker | 1992.03.31 |
| 4062C | Modification Recommended | 4062C-09A | Solution for open relay coil failure | 1999.02.17 |
| 4062F | Modification Recommended | 4062F-02 | Design change of cabinet front door | 1997.02.10 |
| 4062F | Modification Recommended | 4062F-03 | Modification to improve heat dissipation | 1997.02.10 |
| 4062F | Modification Recommended | 4062F-07A | Solution for open relay coil failure | 1999.02.17 |
| 4062UX | Modification Recommended | 4062UX-05 | Recommended replacement of incorrect AC line breaker | 1992.03.31 |
| 4062UX | Modification Recommended | 4062UX-10A | Solution for open relay coil failure | 1999.02.17 |
| 4142B | Modification Recommended | 4142B-10 | Recommended replacement of F5 & F6 fuses on the A1 power supply | 1992.03.31 |
| 4142B | Modification Recommended | 4142B-12 | HCU's current compliance may occur unexpectedly | 1995.01.11 |
| 4142B | Modification Recommended | 4142B-13 | ROM replacement to correct PT command default pulse width | 1996.06.13 |
| 4145B | Modification Recommended | 4145B-02A | SMU brd mod prnts spike when measurng amps with a rnge chnge | 1994.06.23 |
| 4145B | Modification Recommended | 4145B-06 | New fan eliminates excess noise | 1992.03.31 |
| 4155A | Modification Recommended | 4155A-01 | Updating the preliminary ROMs with formal-released ROMs | 1994.03.10 |
| 4155A | Modification Recommended | 4155A-02 | New power supply prevents shut-down failures | 1994.10.10 |
| 4155A | Modification Recommended | 4155A-03 | Motherboard replment for SMU selftest/selfcalib error 10x24 | 1994.11.03 |
| 4155A | Modification Recommended | 4155A-04 | New front panel prevents rotary knob from rubbing front panel | 1994.11.03 |
| 4155A | Modification Recommended | 4155A-05 | New front panel prevents push button keys from sticking | 1994.11.03 |
| 4155A | Modification Recommended | 4155A-06 | Replacing CPU board ROMs fixes firmware defects | 1995.02.16 |
| 4155A | Modification Recommended | 4155A-07 | Replacing CPU board ROMs fix firmware defects | 1996.06.13 |
| 4155A | Modification Recommended | 4155A-09A | Power Supl Replcmnt to Prevent Shutdown/Reboot Problem | 2000.01.17 |
| 4155A | Modification Recommended | 4155A-10A | Replacing CPU board ROMs to fix firmware defects | 1998.10.07 |
| 4155A | Modification Recommended | 4155A-11 | SMU controller firmware update to fix SMU glitch problem | 1998.10.07 |
| 4155A | Modification Recommended | 4155A-12 | SMU controller firmware update to use 41501B expander | 1998.10.07 |
| 4155A | Modification Recommended | 4155A-13 | Firmware update to fix SMU glitch problem | 1998.11.23 |
| 4155B | Modification Recommended | 4155B-01 | SMU controller firmware update to fix SMU glitch problem | 1998.10.07 |
| 4155B | Modification Recommended | 4155B-02 | CPU board replacement to prevent startup failures | 1998.10.07 |
| 4155B | Modification Recommended | 4155B-03 | Firmware update to fix SMU glitch problem | 1998.11.10 |
| 4155B | Modification Recommended | 4155B-04 | Firmware update to fix CPU restart problem | 1998.11.10 |
| 4155B | Modification Recommended | 4155B-05 | CPU board replacement to prevent startup failures | 1999.02.17 |
| 4155B | Modification Recommended | 4155B-07 | Firmware update to remedy units not responding in pulsed sweep mode | 1999.02.17 |
| 4155B | Modification Recommended | 4155B-08 | New firmware fixes incorrect measurement status problem | 1999.06.23 |
| 4155B | Modification Recommended | 4155B-09 | Main power switch is stuck | 2000.10.25 |
| 4155B | Modification Recommended | 4155B-10 | Firmware update to fix some problems | 2001.06.07 |
| 4155B | Modification Recommended | 4155B-11 | Firmware update to fix whining noise from CPU board beeper | 2001.06.18 |
| 4155B | Information Only | 4155B-12 | LCD Replaceable Unit Change | 2003.11.24 |
| 4155C | Modification Recommended | 4155C-01 | Firmware update to fix HRVSU/VMU Diag Fail problem | 2001.05.29 |
| 4155C | Modification Recommended | 4155C-02 | Firmware update to fix some problems | 2001.06.07 |
| 4155C | Modification Recommended | 4155C-03 | Firmware update to fix whining noise from CPU board beeper | 2001.06.18 |
| 4155C | Modification Recommended | 4155C-04 | LCD Picture Intermittently Reverses Or Is Not Displayed | 2003.11.30 |
| 4155C | Modification Recommended | 4155C-05 | LCD Picture Intermittently Reverses or is not Displayed | 2006.05.07 |
| 4156A | Modification Recommended | 4156A-01 | Updating the preliminary ROMs with formal-released ROMs | 1994.03.10 |
| 4156A | Modification Recommended | 4156A-02 | New power supply prevents shut-down failures | 1994.10.10 |
| 4156A | Modification Recommended | 4156A-03 | Repair for SMU selftest/selfcalibration error 10x24 | 1994.11.03 |
| 4156A | Modification Recommended | 4156A-04 | New front panel prevents rotary knob from rubbing front panel | 1994.11.03 |
| 4156A | Modification Recommended | 4156A-05 | New front panel prevents push button keys from sticking | 1994.11.03 |
| 4156A | Modification Recommended | 4156A-07 | Replacing CPU board ROMs fixes firmware defects | 1995.02.16 |
| 4156A | Modification Recommended | 4156A-08 | Replacing CPU board ROMs fix firmware defects | 1996.06.13 |
| 4156A | Modification Recommended | 4156A-10A | Power Supl Replcmnt to Prevent Shutdown/Reboot Problem | 2000.01.17 |
| 4156A | Modification Recommended | 4156A-11A | Replacing CPU board ROMs to fix firmware defects | 1998.10.07 |
| 4156A | Modification Recommended | 4156A-12 | SMU controller firmware update to fix SMU glitch problem | 1998.10.07 |
| 4156A | Modification Recommended | 4156A-13 | SMU controller firmware update to use 41501B expander | 1998.10.07 |
| 4156A | Modification Recommended | 4156A-14 | Firmware update to fix SMU glitch problem | 1998.11.23 |
| 4156B | Modification Recommended | 4156B-01 | SMU controller firmware update to fix SMU glitch problem | 1998.10.07 |
| 4156B | Modification Recommended | 4156B-02 | CPU board replacement to prevent startup failures | 1998.10.07 |
| 4156B | Modification Recommended | 4156B-03 | Firmware update to fix SMU glitch problem | 1998.11.10 |
| 4156B | Modification Recommended | 4156B-04 | Firmware update to fix CPU restart problem | 1998.11.10 |
| 4156B | Modification Recommended | 4156B-05 | CPU board replacement to prevent startup failures | 1999.02.17 |
| 4156B | Modification Recommended | 4156B-07 | Firmware update to remedy units not responding in pulsed sweep mode | 1999.02.17 |
| 4156B | Modification Recommended | 4156B-08 | New firmware fixes incorrect measurement status problem | 1999.06.23 |
| 4156B | Modification Recommended | 4156B-09 | Main power switch is stuck | 2000.10.25 |
| 4156B | Modification Recommended | 4156B-10 | Firmware update to fix some problems | 2001.06.07 |
| 4156B | Modification Recommended | 4156B-11 | Firmware update to fix whining noise from CPU board beeper | 2001.06.18 |
| 4156C | Modification Recommended | 4156C-01 | Firmware update to fix HRVSU/VMU Diag Fail problem | 2001.05.29 |
| 4156C | Modification Recommended | 4156C-02 | Firmware update to fix some problems | 2001.06.07 |
| 4156C | Modification Recommended | 4156C-03 | Firmware update to fix whining noise from CPU board beeper | 2001.06.18 |
| 4156C | Modification Recommended | 4156C-04 | LCD Picture Intermittently Reverses Or Is Not Displayed | 2003.11.30 |
| 4156C | Modification Recommended | 4156C-05 | LCD Picture Intermittently Reverses or is not Displayed | 2006.05.07 |
| 4263B | Modification Recommended | 4263B-01 | Firmware upgrade corrects ADC error in DC biased measurement | 1996.11.21 |
| 4263B | Modification Recommended | 4263B-02 | Mod to prevent ""ADC FAILURE"" after power on / Reset is done | 1998.12.14 |
| 4263B | Modification Recommended | 4263B-03 | Modification to prevent ""EEPROM R/W FAILED"" | 1998.12.14 |
| 4263B | Modification Recommended | 4263B-04 | Mod to prevent ""ADC FAILURE"" when Recall function is used | 1998.12.14 |
| 4263B | Modification Recommended | 4263B-05 | The HP4263B short correction value is large by only 100kHZ on the Test Fixture | 1999.06.23 |
| 4263B | Modification Recommended | 4263B-06 | Measurement accuracy may be out of specification | 2001.02.12 |
| 4263B | Modification Recommended | 4263B-07A | Modification to fix intermittent illigal data readings | 2001.08.22 |
| 4263B | Modification Recommended | 4263B-08 | Incorrect characters might be displayed on rare occasions. | 2004.09.21 |
| 4268A | Modification Recommended | 4268A-01 | Modification to prevent missing an external trigger signal | 2000.10.31 |
| 4268A | Priority Safety | 4268A-03-S | A broken AC inlet may potentially result in a electric shock hazard | 2000.10.08 |
| 4284A | Modification Recommended | 4284A-11A | Modification prevents bias current source fuse from blowing | 1995.01.11 |
| 4284A | Modification Recommended | 4284A-13 | Mod to eliminate ""Scanner data CSUM error"" | 2000.11.12 |
| 4284A | Modification Recommended | 4284A-16 | Modification Required to Add A20 GPIB Interface | 2003.04.01 |
| 4285A | Modification Recommended | 4285A-09A | Mod prevents bias current source fuse from blowing | 1995.01.11 |
| 4285A | Modification Recommended | 4285A-11 | Mod to eliminate ""Scanner data CSUM error"" | 2000.11.12 |
| 4286A | Modification Recommended | 4286A-04 | Modification to fix Internal Real Time Clock Delay trouble | 1998-07 |
| 4287A | Modification Recommended | 4287A-01A | Mod to fix booting problem | 2000.11.12 |
| 4287A | Modification Recommended | 4287A-02 | Repair of error ""Power on test faild"" about applicable serial number. | 2001.12.18 |
| 4287A | Modification Recommended | 4287A-07A | “PLL unlock” Error Message due to A3 Source Board Failure | 2008.07.09 |
| 4287A | Modification Recommended | 4287A-08 | Abrupt hang-up in continuous measurements | 2007.02.06 |
| 4287A | Modification Recommended | 4287A-10 | Unable to detect GPIB card causing slow response in measurement | 2007.08.08 |
| 4288A | Modification Recommended | 4288A-01 | Firmware update for bug fix | 2001.05.24 |
| 4288A | Modification Recommended | 4288A-03 | Incorrect items for instrument setup screens might be displayed on rare occasions. | 2004.09.21 |
| 4288A | Modification Recommended | 4288A-04A | The specification of D factor at 1MHz becomes out of specification because of the wrong linearity | 2006.06.04 |
| 4288A | Modification Recommended | 4288A-06 | E21 Save Failed problem on Save function and OVLD display problem on Multi Compensation function | 2007.01.29 |
| 4291A | Modification Recommended | 4291A-04 | Modification to fix Internal Real Time Clock Delay trouble | 1998-07 |
| 4291B | Modification Recommended | 4291B-01 | Mod to fix intermittent display problem | 1998.10.07 |
| 4291B | Modification Recommended | 4291B-02A | To fix internal real time clock delay trouble | 1998.11.10 |
| 4291B | Modification Recommended | 4291B-03 | Mod to fix sample program error for high temp. option 013 & 014 | 1998.11.10 |
| 4291B | Modification Recommended | 4291B-04 | Measured accuracy test fail | 1998.11.10 |
| 4291B | Safety | 4291B-05-S | Power supply does not comply with CSA950/IEC950 stadards | 1998.12.14 |
| 4291B | Modification Recommended | 4291B-06 | No display when power is on | 1998.08.09 |
| 4291B | Priority Safety | 4291B-07-S | A broken AC inlet may potentially result in a electric shock hazard | 2000.10.08 |
| 4291B | Modification Recommended | 4291B-08A | Power-on failure due to a stressed Capacitor on the DC-DC Converter Board. | 2002.05.01 |
| 4294A | Modification Recommended | 4294A-01 | External tests for analog circuits | 2002.11.02 |
| 4294A | Safety | 4294A-02A-S | A broken AC inlet may potentially result in an electric shock hazard. | 2012.02.27 |
| 4294A | Modification Recommended | 4294A-03A | Power-on failure due to a stressed Capacitor on the DC-DC Converter Board. | 2002.05.01 |
| 4294A | Modification Recommended | 4294A-04 | Intermittent failure about A8 (Vector Ratio Detector) | 2002.05.27 |
| 4338B | Modification Recommended | 4338B-01 | Incorrect characters might be displayed on rare occasions. | 2004.09.28 |
| 4339B | Modification Recommended | 4339B-01 | Mod to prevent "":SYST:ERR?"" HP-IB command problem | 1999.02.17 |
| 4339B | Modification Recommended | 4339B-02 | Mod to prevent unit from hanging up when improper OPEN correction is performed | 1999.02.17 |
| 4339B | Modification Recommended | 4339B-03 | Mod to fix incorrect Handler Interface signal | 1999.02.17 |
| 4339B | Modification Recommended | 4339B-04 | Incorrect characters might be displayed on rare occasions | 2004.09.27 |
| 4339B | Modification Recommended | 4339B-05 | Offset Voltage Test might fail, during PVT | 2017.09.18 |
| 4349B | Modification Recommended | 4349B-01 | Modification to prevent ":SYST:ERR?" HP-IB command problem | 1998.12.31 |
| 4349B | Modification Recommended | 4349B-02 | Mod to prevent unit from hanging up when improper OPEN correction is performed | 1999.02.17 |
| 4349B | Modification Recommended | 4349B-03 | Mod to fix incorrect Handler Interface signal | 1999.02.17 |
| 4349B | Modification Recommended | 4349B-04 | Incorrect characters might be displayed on rare occasions. | 2004.09.28 |
| 4349B | Modification Recommended | 4349B-05 | Remedy for OVLD display due to incomplete soldering of capacitor on A1board | 2006.10.04 |
| 4352A | Modification Recommended | 4352A-01 | Modification to fix Internal Real Time Clock Delay trouble | 1998-07 |
| 4352B | Safety | 4352B-07-S | POWER SUPPLY DOES NOT COMPLY WITH CSA950/IEC950 STANDARDS | 1998.06.30 |
| 4352B | Priority Safety | 4352B-08-S | A broken AC inlet may Potentially result in a electric shock hazard. | 2000.08.31 |
| 4395A | Modification Recommended | 4395A-02 | Mod to prevent intermittent display problem | 1998.10.13 |
| 4395A | Modification Recommended | 4395A-03 | Mod to prevent intermittent display problem | 1998.10.13 |
| 4395A | Modification Recommended | 4395A-05 | Mod to fix internal real time clock delay trouble | 1998.10.07 |
| 4395A | Safety | 4395A-06-S | POWER SUPPLY DOES NOT COMPLY WITH CSA950/IEC950 STANDARDS | 1998.07.31 |
| 4395A | Modification Recommended | 4395A-07 | No display when power is on | 1999.08.09 |
| 4395A | Priority Safety | 4395A-09-S | A broken AC inlet may Potentially result in a electric shock hazard. | 2000.08.31 |
| 4395A | Modification Recommended | 4395A-10A | Power-on failure due to a stressed Capacitor on the DC-DC Converter Board. | 2002.05.01 |
| 4395A | Modification Recommended | 4395A-11 | Spurious on the trace trouble in Network measurement mode | 2001.07.16 |
| 4395A | Modification Recommended | 4395A-16 | Firmware upgrade to fix occasional rise in noise floor and the shift of measurement signal in frequency with SA mode. | 2005.07.04 |
| 4396A | Information Only | 4396A-01C | Firmware Update and A1 CPU Repair Information | 1995-02 |
| 4396A | Modification Recommended | 4396A-02 | Firmware Upgrade to Correct Auto Zoom and Save/Recall Operations | 1993.01.31 |
| 4396A | Information Only | 4396A-03 | Repair Procedure for A1 CPU (pn 04396-66501 or pn 04396-66511) | 1993.06.14 |
| 4396A | Information Only | 4396A-04 | Firmware Update Procedures | 1993.06.14 |
| 4396A | Modification Recommended | 4396A-05 | A2 Shutdown Circuit Malfunction | 1993.06.10 |
| 4396A | Modification Recommended | 4396A-06 | “POWER ON TEST FAILED” or “PHASE LOOK LOOP UNLOCKED” at Low Temperature | 1993.06.10 |
| 4396A | Modification Recommended | 4396A-07 | “POWER ON TEST FAILED” at Low Temperature | 1993.06.10 |
| 4396A | Information Only | 4396A-08 | New power switch improves reliability | 1993.11.23 |
| 4396A | Modification Recommended | 4396A-09 | Low RF output level caused by defective A3A3 | 1994.01.21 |
| 4396A | Modification Recommended | 4396A-10 | Modification improves rubber key sticking | 1994.01.21 |
| 4396A | Modification Recommended | 4396A-11 | Mod. corrects “PHASE LOCKED LOOP UNLOCKED” at high temperature | 1994.02.28 |
| 4396A | Information Only | 4396A-12 | Option Upgrade Procedure | 1994.03.01 |
| 4396A | Modification Recommended | 4396A-13 | New firmware corrects some bugs on firmware revision 3.00 | 1994-10 |
| 4396A | Modification Recommended | 4396A-14A | New firmware corrects incorrect GPIB return value of “*TST?” query. | 1995-02 |
| 4396A | Modification Recommended | 4396A-16 | Modification to fix Internal Real Time Clock Delay trouble | 1998-07 |
| 4396B | Modification Recommended | 4396B-01 | Modification to prevent power supply failure | 1998.03.01 |
| 4396B | Information Only | 4396B-02 | Replacement for obsoleted LCD P/N 2090-0534 | 1998-08 |
| 4396B | Modification Recommended | 4396B-03 | Mod to fix intermittent display problem | 1998.10.13 |
| 4396B | Modification Recommended | 4396B-04 | Mod to prevent intermittent display problem | 1998.10.13 |
| 4396B | Information Only | 4396B-05 | Use of GSP PN E4970-66552 and LCD PN 2090-0574 may cause a display problem | 1998-07 |
| 4396B | Modification Recommended | 4396B-06A | Mod to fix internal real time clock delay trouble | 2001.07.15 |
| 4396B | Safety | 4396B-07-S | POWER SUPPLY DOES NOT COMPLY WITH CSA950/IEC950 STANDARDS | 1998.07.31 |
| 4396B | Modification Recommended | 4396B-08 | No display when power is on | 1999.08.09 |
| 4396B | Modification Recommended | 4396B-09 | No recall of compensation data when using Impedance measurement mode | 2000.01.17 |
| 4396B | Priority Safety | 4396B-10-S | A broken AC inlet may Potentially result in a electric shock hazard. | 2000.08.31 |
| 4396B | Modification Recommended | 4396B-11A | Power-on failure due to a stressed Capacitor on the DC-DC Converter Board. | 2002.05.01 |
| 4396B | Information Only | 4396B-12A | Part number changes for LCD | 2004.03.23 |
| 4396B | Information Only | 4396B-13 | Part Number Changes for Power Supply Switch Parts | 2002.09.12 |
| 4396B | Information Only | 4396B-14 | New Replaceable Parts for Probe Power Supply | 2002.10.08 |
| 4800A | Modification Available | 4800A-02 | Thermistor A17R14 Replacement – hp Modification Kit 04800-61043 | 1968-02 |
| 4800A | Modification Available | 4800A-03 | Error in Transformer Wiring | 1969-06 |
| 4800A | Modification Available | 4800A-04 | Power Supply Modification | 1969-10 |
| 4934A | Modification Recommended | 4934A-11A | Recommended modification prevents hold circuit failure | 1992.10.31 |
| 4934A | Safety | 4934A-15-S | Short Circuit Hazard | 1997.08.31 |
| 4934A | Modification Recommended | 4934A-16 | Instructions for ground modifications | 1998.10.13 |
| 4934A | Modification Recommended | 4934A-18 | Receive level problem | 2001.06.13 |
| 4935A | Modification Recommended | 4935A-16 | Modification to correct signal measurement when using receiver hold circuit | 1993.02.28 |
| 4948A | Modification Recommended | 4948A-09 | Modification fixes measurement hang-up with error code 2000 | 1992.07.31 |
| 4951C | Modification Recommended | 4951C-14 | Modification to eliminate erroneous ABORT frames | 1991.05.31 |
| 4952A | Modification Available | 4952A-12B | Available firmware upgrade from Rev. 1.0 to Rev. A.02.02 | 1992.02.29 |
| 4952A | Modification Available | 4952A-17 | Real time clock allows captured data in buffer to be time stamped | 1993.02.28 |
| 4954A | Modification Recommended | 4954A-08 | New firmware revision 2.1 corrects several known problems | 1993.02.28 |
| 4957A | Modification Available | 4957A-01C | Available option allows high speed option retrofitting | 1994.03.10 |
| 4957A | Modification Recommended | 4957A-04 | New ROM fixes DLC Data Bus Contention problem/A1UT4 | 1992.10.31 |
| 4957A | Modification Recommended | 4957A-05A | Modification to prevent enlargement or shrinkage of display | 1992.02.29 |
| 4957A | Modification Recommended | 4957A-07 | Modification to misloaded diodes corrects ""no display"" | 1992.02.29 |
| 4957A | Modification Recommended | 4957A-08 | Firmware Revision A.00.01 Anomalies | 1992.02.29 |
| 4957A | Modification Available | 4957A-09 | Katakana option retrofitting | 1992.02.29 |
| 4957PC | Modification Available | 4957PC-01B | Available option allows high speed option retrofitting | 1993.12.31 |
| 4957PC | Modification Recommended | 4957PC-02 | New ROMs fix auto-configuration anomaly | 1992.02.29 |
| 4957PC | Modification Recommended | 4957PC-03 | Modification to stop monitoring and/or simulating | 1992.02.29 |
| 4957PC | Modification Recommended | 4957PC-04 | Modification correct MASS STORE or LOAD APPLICATION features | 1992.04.30 |
| 4980A | Safety | 4980A-02-S | Modification to meet grounding standards | 1991.10.07 |
| 4980A | Modification Recommended | 4980A-03A | Modification to eliminate bad sectors on hard disk drive | 1992.05.31 |
| 4980A | Modification Recommended | 4980A-04 | Modification prevents trace shorting on the LCD board | 1992.04.30 |
| 4980A | Modification Recommended | 4980A-05A | Modification to resolve ""Service Request Time-out on Port xxx"" error | 1992.05.31 |
| 4980A | Modification Recommended | 4980A-06A | Modification to resolve ""Hardware/Software Watchdog Time-out Errors"" | 1992.07.31 |
| 4980A | Modification Available | 4980A-07 | Directions on upgrading hard disk drive to 105 MByte | 1992.06.30 |
| 4980A | Modification Available | 4980A-08 | Directions on upgrading capture buffer to 16 MByte | 1992.06.30 |
| 4980A | Modification Recommended | 4980A-09 | Modification resolves ""bootup/time-out errors"" | 1992.10.31 |
| 4980A | Modification Recommended | 4980A-11 | LED board mod allows greater range of brightness adjustment | 1993.12.12 |
| 4981A | Safety | 4981A-02-S | Modification to meet grounding standards | 1991.10.07 |
| 4981A | Modification Recommended | 4981A-03 | Modification eliminates bad sectors on hard disk drive | 1992.04.30 |
| 4981A | Modification Recommended | 4981A-04 | Modification prevents trace shorting on the LCD board | 1992.04.30 |
| 4981A | Modification Recommended | 4981A-05A | Modification to resolve ""Service Request Time-out on Port XXX"" error | 1992.06.30 |
| 4981A | Modification Recommended | 4981A-06A | Modification to resolve ""Hardware/Software Watchdog Time-out Errors"" | 1992.07.31 |
| 4981A | Modification Available | 4981A-07 | Directions on upgrading hard disk drive to 105 MByte | 1992.06.30 |
| 4981A | Modification Available | 4981A-08 | Directions on upgrading capture buffer to 16 MByte | 1992.06.30 |
| 4981A | Modification Recommended | 4981A-09 | Modification resolves ""bootup/time-out errors"" | 1992.10.31 |
| 4981A | Modification Recommended | 4981A-11 | LED board mod allows greater range of brightness adjustment | 1993.12.12 |
| 4982A | Safety | 4982A-02-S | Modification to meet grounding standards | 1991.10.07 |
| 4982A | Modification Recommended | 4982A-03 | Modification eliminates bad sectors on hard disk drive | 1992.04.30 |
| 4982A | Modification Recommended | 4982A-04 | Modification prevents trace shorting on the LCD board | 1992.04.30 |
| 4982A | Modification Recommended | 4982A-05A | Modification to resolve ""Service Request Time-out on Port XXX"" error | 1992.06.30 |
| 4982A | Modification Recommended | 4982A-06A | Modification to resolve ""Hardware/Software Watchdog Time-out Errors"" | 1992.07.31 |
| 4982A | Modification Available | 4982A-07 | Directions on upgrading hard disk drive to 105 MByte | 1992.06.30 |
| 4982A | Modification Available | 4982A-08 | Directions on upgrading capture buffer to 16 MByte | 1992.06.30 |
| 4982A | Modification Recommended | 4982A-09 | Modification resolves ""bootup/time-out errors"" | 1992.10.31 |
| 4982A | Modification Recommended | 4982A-11 | LED board mod allows greater range of brightness adjustment | 1993.12.12 |
| 4985B | Modification Recommended | 4985B-01 | Noise on int buss causes processor to corrupt its internal program | 1998.03.01 |
| 4985B | Modification Recommended | 4985B-02 | Auto ring speed detection fails | 1998.03.01 |
| 4986A | Modification Recommended | 4986A-01 | Modification to power modules improves 5 VDC stability | 1995.10.31 |
| 4991A | Modification Recommended | 4991A-12 | Modification improves reliability of P1 & P2 power supply connections | 1992.10.31 |
| 4991A | Modification Recommended | 4991A-13 | Modification to fix ""Node Movement, or Node Hopping,"" and network performance | 1992.02.29 |
| 4992A | Modification Recommended | 4992A-02 | Modification to fix ""Node Movement, or Node Hopping,"" and network performance | 1992.02.29 |
| 4995A | Modification Recommended | 4995A-01 | Modification eliminates possible power up problems | 1993.03.31 |
| 4995A | Modification Recommended | 4995A-02 | Jumper wires in serial controller chip improve performance | 1994.10.10 |
| 4996A | Modification Recommended | 4996A-01 | Modification eliminates possible power up problems | 1993.03.31 |
| 4996A | Modification Recommended | 4996A-02 | Jumper wires in serial controller chip improve performance | 1994.10.10 |
| 5004A | Modification Available | 5004A-1B | DATA PROBE THRESHOLD VOLTAGE ADJUSTMENT AND COMPENSATION | 1978-08 |
| 5335A | Modification Recommended | 5335A-23 | DEGRADED SENSITIVITY WITH SPECIAL OPTION C10 | 1988-09 |
| 5335A | Modification Recommended | 5335A-24 | PREFERRED REPLACEMENT PART FOR A9CR6 AND A9CR4 | 1988-10 |
| 5335A | Modification Recommended | 5335A-26B | Power Supply relay problem | 1992.03.23 |
| 5343A | Safety | 5343A-31C-S | New cabinet support strut and top cover | 1993.01.12 |
| 5344A | Safety | 5344A-01A-S | New cabinet support strut and top cover | 1993.01.12 |
| 5345A | Modification Available | 5345A-1 | Serial prefix 1428- and below. Input amplifier failures. | 1975-01 |
| 5345A | Modification Available | 5345A-2 | Serial prefix 1428 and above. Input amplifier failures. | 1975-04 |
| 5345A | Information Only | 5345A-6 | A9 Maingate Assembly troubleshooting procedure | 1977-07 |
| 5345A | Information Only | 5345A-7 | A11 Scaler Assembly troubleshooting procedure | 1977-07 |
| 5345A | Information Only | 5345A-8 | A10 Gate Control Assembly troubleshooting procedure | 1977-07 |
| 5345A | Information Only | 5345A-9A | 9825 HP-IB verification program for 5345A, opt 011 (Supersedes 5345A-9) | 1980.02.05 |
| 5345A | Information Only | 5345A-9B | HP-IB verification program for 5345A, opt 011 (Supersedes 5345A-9A) | 1981-01 |
| 5345A | Modification Recommended | 5345A-10A | Serials 1708 and below. Resistor changes on A4 input trigger assembly (05345-60004) to improve performance. (Supersedes 5345A-10) | 1979.02.12 |
| 5345A | Modification Available | 5345A-11 | All serials. Modification to A7 linear regulator assembly (05345-60007) to improve +15V supply operation | 1978.02.03 |
| 5345A | Information Only | 5345A-12B | HP-IB verification program for 5345A, Opt. 012 (Supersedes 5345A-12A) | 1981-01 |
| 5345A | Information Only | 5345A-13 | All serials. Clarification of special extender board compatibility with 5345A counters. | 1978-02 |
| 5345A | Modification Recommended | 5345A-14 | All serials. Elimination of shorting between circuit boards and board sockets. | 1979-05 |
| 5345A | Modification Recommended | 5345A-15 | Serials 1920A and below. Modification to improve mechanical interconnection with plug-ins. | 1979-06 |
| 5345A | Modification Recommended | 5345A-16 | A13 boards with series 1820 and 1912. Modification to prevent miscounting on REG CLK line | 1979-06 |
| 5345A | Modification Recommended | 5345A-16A | A13 boards with series 1820 and 1912. Modification to prevent miscounting caused by noise on reg. clk. line. | 1980-05 |
| 5345A | Modification Available | 5345A-17 | All serials. Summary of A3 and A4 Assembly U1 and U2 changes, replacement part numbers, and bias adjustments | 1981-03 |
| 5345A | Information Only | 5345A-18 | All serials. ROM part number changes. | 1981-09 |
| 5345A | Information Only | 5345A-19A | All serials. HP-IB verification program for 5345A option 011 using the HP 85A controller. (Supersedes 5345A-19) | 1982-01 |
| 5345A | Modification Available | 5345A-21 | All serials. HP-IB modification for Option 012 compatibility with HP 1000L series computers. | 1981-09 |
| 5345A | Modification Available | 5345A-22 | All options and serial number prefixes. Modification to improve input sensitivity | 1982-02 |
| 5345A | Modification Available | 5345A-23 | Option 012 serials. Modification to allow counter to respond properly to a serial poll by a series 200 controller. | 1984-03 |
| 5345A | Modification Available | 5345A-24 | 5345A serials 21 34A07500 through 2346A10040 used with the 5355A automatic frequency converter plug-in and the 5356A/B/C frequency converter heads. Modification to prevent miscount problem. | 1984-03 |
| 5345A | Modification Available | 5345A-25 | All serials. Modification to eliminate temperature sensitive input amplifier. | 1984-03 |
| 5501B | Modification Recommended | 5501B-02A | In many incidences, the temperature adjustment process for the laser heads had been found being adjusted incorrectly. | 2002-07 |
| 5517A | Modification Recommended | 5517A-01B | Recommended repair of sampler assembly | 1995.07.27 |
| 5517A | Modification Recommended | 5517A-02 | Recommended repair of sampler assy | 1996.03.14 |
| 5517A | Modification Recommended | 5517A-04A | Temperature adjustment process | 2001.07.16 |
| 5517B | Modification Recommended | 5517B-02 | Recommended repair of sampler assy | 1996.03.14 |
| 5517B | Modification Recommended | 5517B-04A | Temperature adjustment process | 2001.07.16 |
| 5517B | Modification Recommended | 5517B-05A | Controller Board A3F1 Nuisance blows | 2006.02.09 |
| 5517C | Modification Recommended | 5517C-02 | Recommended repair of sampler assy | 1996.03.14 |
| 5517C | Modification Recommended | 5517C-04A | Temperature adjustment process | 2001.07.16 |
| 5517CN05 | Modification Recommended | 5517C-05B | Controller Board A3F1 Nuisance blows | 2006.03.16 |
| 5517D | Modification Recommended | 5517D-02 | Recommended repair of sampler assy | 1996.03.14 |
| 5517D | Modification Recommended | 5517D-04A | Temperature adjustment process | 2001.07.16 |
| 5517DN07 | Modification Recommended | 5517D-05B | Controller Board A3F1 Nuisance blows | 2006.03.16 |
| 5518A | Modification Recommended | 5518A-01B | Recommended repair of sampler assembly | 1995.07.27 |
| 5519A | Modification Recommended | 5519A-02A | Temperature adjustment process | 2001.07.16 |
| 5519B | Modification Recommended | 5519B-02A | Temperature adjustment process | 2001.07.16 |
| 6012A | Modification Recommended | 6012A-1 | Serial Numbers 1946AOO140 and Below CURRENT MONITOR RESISTOR CHANGE | 1981-10 |
| 6012A | Modification Recommended | 6012A-2 | Serial Numbers 2116AOO300 and Below – NEW FAN INSTALLATION HARDWARE | 1981-10 |
| 6012A | Modification Recommended | 6012A-3 | MODIFICATION TO STABILIZE CONTROL BOARD IN PCB EDGE CONNECTOR – Serial Numbers 2121A-00380 and Below | 1981-10 |
| 6012B | Modification Recommended | 6012B-08 | Misloaded fuse | 1998.11.10 |
| 6030A | Modification Recommended | 6030A-13 | Modification using RTV to prevent W8 ribbon cable disconnect | 1992.04.30 |
| 6030A | Modification Available | 6030A-17 | AC input filter assembly replacement | 1994.06.23 |
| 6030A | Modification Recommended | 6030A-21 | GPIB Communications Error when used with a 59510A or 59511A Relay Box | 2002.06.02 |
| 6030A | Modification Recommended | 6030A-22 | To correct the “CC” Constant Current mode offset performance anomaly. | 2011.05.12 |
| 6031A | Modification Recommended | 6031A-15 | Modification using RTV to prevent W8 ribbon cable disconnect | 1992.04.30 |
| 6031A | Modification Available | 6031A-19 | AC input filter assembly replacement | 1994.06.23 |
| 6031A | Modification Recommended | 6031A-23 | GPIB Communications Error when used with a 59510A or 59511A Relay Box | 2002.06.02 |
| 6031A | Modification Recommended | 6031A-24 | To correct the “CC” Constant Current mode offset performance anomaly. | 2011.05.12 |
| 6032A | Modification Recommended | 6032A-14 | Modification using RTV to prevent W8 ribbon cable disconnect | 1992.04.30 |
| 6032A | Modification Recommended | 6032A-19 | Misloaded fuse | 1998.11.10 |
| 6032A | Modification Recommended | 6032A-22 | GPIB Communications Error when used with a 59510A or 59511A Relay Box | 2002.06.02 |
| 6032A | Modification Recommended | 6032A-23 | To correct the “CC” Constant Current mode offset performance anomaly. | 2011.05.12 |
| 6033A | Modification Recommended | 6033A-14 | GPIB Communications Error when used with a 59510A or 59511A Relay Box | 2002.06.02 |
| 6033A | Modification Recommended | 6033A-15 | To correct the “CC” Constant Current mode offset performance anomaly. | 2011.05.12 |
| 6035A | Modification Recommended | 6035A-03 | Modification using RTV to prevent W8 ribbon cable disconnect | 1992.04.30 |
| 6035A | Modification Recommended | 6035A-04 | Modification prevents spurious high frequency down programmer FET oscillations | 1992.04.30 |
| 6035A | Modification Recommended | 6035A-11 | GPIB Communications Error when used with a 59510A or 59511A Relay Box | 2002.06.02 |
| 6035A | Modification Recommended | 6035A-12 | To correct the “CC” Constant Current mode offset performance anomaly. | 2011.05.12 |
| 6038A | Modification Recommended | 6038A-12 | GPIB Communications Error when used with a 59510A or 59511A Relay Box | 2002.06.02 |
| 6038A | Modification Recommended | 6038A-13 | To correct the “CC” Constant Current mode offset performance anomaly. | 2011.05.12 |
| 6060B | Modification Recommended | 6060B-02 | Safety compliance of RFI Filter capacitor discharge time constant | 1993.06.30 |
| 6060B | Safety | 6060B-04A-S | Due to poor soldering, the instrument’s internal safety grounding may be faulty. | 2010.05.17 |
| 6063B | Modification Recommended | 6063B-02 | Safety compliance of RFI Filter capacitor discharge time constant | 1993.06.30 |
| 6063B | Safety | 6063B-04A-S | Due to poor soldering, the instrument’s internal safety grounding may be faulty. | 2010.05.17 |
| 6259B | Modification Recommended | 6259B-3A | HP MODELS 6259B, 6260B, 6261B, 6268B, 6269B LVR POWER SUPPLIES - IMPROVED RELIABILITY CHANGES | 1980-12 |
| 6260B | Modification Recommended | 6260B-2A | HP MODELS 6259B, 6260B, 6261B, 6268B, 6269B LVR POWER SUPPLIES - IMPROVED RELIABILITY CHANGES | 1980-12 |
| 6261B | Modification Recommended | 6261B-2 | HP MODELS 6259B, 6260B, 6261B, 6268B, 6269B LVR POWER SUPPLIES - IMPROVED RELIABILITY CHANGES | 1980-12 |
| 6268B | Modification Recommended | 6268B-2A | HP MODELS 6259B, 6260B, 6261B, 6268B, 6269B LVR POWER SUPPLIES - IMPROVED RELIABILITY CHANGES | 1980-12 |
| 6269B | Modification Recommended | 6269B-4 | HP MODELS 6259B, 6260B, 6261B, 6268B, 6269B LVR POWER SUPPLIES - IMPROVED RELIABILITY CHANGES | 1980-12 |
| 6541A | Modification Recommended | 6541A-02A | Intermittent Phone Cables | 2001.01.31 |
| 6542A | Modification Recommended | 6542A-02A | Intermittent Phone Cables | 2001.01.31 |
| 6543A | Modification Recommended | 6543A-02A | Intermittent Phone Cables | 2001.01.31 |
| 6544A | Modification Recommended | 6544A-02A | Intermittent Phone Cables | 2001.01.31 |
| 6545A | Modification Recommended | 6545A-01A | Capacitor C418 May Fail | 2002.05.03 |
| 6545A | Modification Recommended | 6545A-03A | Intermittent Phone Cables | 2001.01.31 |
| 6551A | Modification Recommended | 6551A-02 | Intermittent Phone Cables | 1999.07.31 |
| 6551A | Safety | 6551A-06 | Regulatory noncompliance with the option 901 (Power cord for Australia / New Zealand) | 2016.06.08 |
| 6552A | Modification Recommended | 6552A-02 | Intermittent Phone Cables | 1999.07.31 |
| 6552A | Safety | 6552A-06A-S | Regulatory noncompliance with the option 901 (Power cord for Australia / New Zealand) | 2017.05.11 |
| 6553A | Modification Recommended | 6553A-02 | Intermittent Phone Cables | 1999.07.31 |
| 6553A | Modification Recommended | 6553A-04 | Bridge Rectifier Failure | 1999.11.30 |
| 6553A | Modification Recommended | 6553A-05 | Cannot Perform Current Calibration / Alignment | 2002.05.30 |
| 6553A | Safety | 6553A-08A-S | Regulatory noncompliance with the option 901 (Power cord for Australia / New Zealand) | 2017.05.11 |
| 6554A | Modification Recommended | 6554A-02 | Intermittent Phone Cables | 1999.07.31 |
| 6554A | Safety | 6554A-08 | Regulatory noncompliance with the option 901 (Power cord for Australia / New Zealand | 2016.06.09 |
| 6555A | Modification Recommended | 6555A-02 | Intermittent Phone Cables | 1999.07.31 |
| 6555A | Modification Recommended | 6555A-04 | Zero ohm resistor breakdown | 2001.05.22 |
| 6555A | Safety | 6555A-07 | Regulatory noncompliance with the option 901 (Power cord for Australia / New Zealand) | 2016.06.08 |
| 6571A | Modification Recommended | 6571A-03 | Intermittent Phone Cables | 1999.07.31 |
| 6571A | Modification Recommended | 6571A-06A | Upgrade for unstable Current Shunts ""R907"" | 2003.10.16 |
| 6571A | Modification Recommended | 6571A-08 | The four filter capacitors circuit reference (C416-C419) on the A4 AC input board starts leaking electrolyte | 2009.08.18 |
| 6571A | Modification Recommended | 6571A-09 | The AC INPUT SAFETY COVER has a strain relief used to secure the AC line cord that may become loose. | 2009.10.08 |
| 6572A | Modification Recommended | 6572A-03 | Intermittent Phone Cables | 1999.07.31 |
| 6572A | Modification Recommended | 6572A-05A | Upgrade for Unstable Current Shunt ""R907"" | 2003.10.16 |
| 6572A | Modification Recommended | 6572A-06 | Slow or No Down Programming capability | 2006.07.30 |
| 6572A | Modification Recommended | 6572A-08 | The four filter capacitors circuit reference (C416-C419) on the A4 AC input board starts leaking electrolyte | 2009.08.18 |
| 6572A | Modification Recommended | 6572A-09 | The AC INPUT SAFETY COVER has a strain relief used to secure the AC line cord that may become loose. | 2009.10.08 |
| 6573A | Modification Recommended | 6573A-03 | Intermittent Phone Cables | 1999.07.31 |
| 6573A | Modification Recommended | 6573A-05A | Upgrade for Unstable Current Shunt ""R409"" | 2003.10.16 |
| 6573A | Modification Recommended | 6573A-07 | The four filter capacitors circuit reference (C416-C419) on the A4 AC input board starts leaking electrolyte | 2009.08.18 |
| 6573A | Modification Recommended | 6573A-08 | The AC INPUT SAFETY COVER has a strain relief used to secure the AC line cord that may become loose. | 2009.10.08 |
| 6574A | Modification Recommended | 6574A-03 | Improper Crimps on Output Transformer & Choke | 1999.02.28 |
| 6574A | Modification Recommended | 6574A-04 | Intermittent Phone Cables | 1999.07.31 |
| 6574A | Modification Recommended | 6574A-07A | Upgrade for Unstable Current Shunt ""R907"" | 2003.10.16 |
| 6574A | Modification Recommended | 6574A-09 | The four filter capacitors circuit reference (C416-C419) on the A4 AC input board starts leaking electrolyte | 2009.08.18 |
| 6574A | Modification Recommended | 6574A-10 | The AC INPUT SAFETY COVER has a strain relief used to secure the AC line cord that may become loose. | 2009.10.08 |
| 6575A | Modification Recommended | 6575A-01 | Modification improves reliability of sense protection resistors | 1993.01.31 |
| 6575A | Modification Recommended | 6575A-04 | Improper Crimps on Output Transformer & Choke | 1999.02.28 |
| 6575A | Modification Recommended | 6575A-05 | Intermittent Phone Cables | 1999.07.31 |
| 6575A | Modification Recommended | 6575A-07A | Upgrade for Unstable Current Shunt ""R907"" | 2003.10.16 |
| 6575A | Modification Recommended | 6575A-09 | The four filter capacitors circuit reference (C416-C419) on the A4 AC input board starts leaking electrolyte | 2009.08.18 |
| 6575A | Modification Recommended | 6575A-10 | The AC INPUT SAFETY COVER has a strain relief used to secure the AC line cord that may become loose. | 2009.10.08 |
| 6611C | Modification Recommended | 6611C-01A | RS232/HP-IB Firmware Hang-ups | 1999.08.09 |
| 6611C | Modification Recommended | 6611C-04B | Unit Exchange Program | 2001.01.31 |
| 6611C | Modification Recommended | 6611C-07A | On faster computers, when programming over GPIB, a random error will occur. | 2005.11.01 |
| 6611C | Modification Recommended | 6611C-760-01B | Unit exchange program | 2001.05.22 |
| 6611C | Modification Recommended | 6611C-J05-01 | RS232/HP-IB Firmware Hang-ups | 1998.11.23 |
| 6612C | Modification Recommended | 6612C-04B | Unit Exchange Program | 2001.01.31 |
| 6612C | Modification Recommended | 6612C-07A | On faster computers, when programming over GPIB, a random error will occur. | 2005.11.01 |
| 6612C | Modification Recommended | 6612C-760-01B | Unit Exchange Program | 2001.01.31 |
| 6613C | Modification Recommended | 6613C-04B | Unit Exchange Program | 2001.01.31 |
| 6613C | Modification Recommended | 6613C-07A | On faster computers, when programming over GPIB, a random error will occur. | 2005.11.01 |
| 6613C | Modification Recommended | 6613C-760-01B | Unit Exchange Program | 2001.01.31 |
| 6613C | Modification Recommended | 6613C-RECALL-08 | Calibrations performed on some Power Supplies by Agilent Technologies between July 1st, 2011 and July 31st, 2012 show a FALSE PASS in either one or more of the 4 tests: CC LOAD EFFECT, CV LOAD EFFECT, CC SOURCE EFFECT or CV SOURCE EFFECT. | 2012.08.19 |
| 6614C | Modification Recommended | 6614C-04B | Unit Exchange Program | 2001.01.31 |
| 6614C | Modification Recommended | 6614C-07A | On faster computers, when programming over GPIB, a random error will occur. | 2005.11.01 |
| 6614C | Modification Recommended | 6614C-760-01A | Unit exchange program | 2001.05.22 |
| 6614C | Modification Recommended | 6614C-760-01B | Unit Exchange Program | 2001.01.31 |
| 6614C | Modification Recommended | 6614C-RECALL-08 | Calibrations performed on some Power Supplies by Agilent Technologies between July 1st, 2011 and July 31st, 2012 show a FALSE PASS in either one or more of the 4 tests: CC LOAD EFFECT, CV LOAD EFFECT, CC SOURCE EFFECT or CV SOURCE EFFECT. | 2012.08.19 |
| 6621A | Modification Recommended | 6621A-13 | Defective Cable | 2000.04.30 |
| 6621A | Modification Recommended | 6621A-14 | Intermittent Power Transformer “Magmate” Connections | 2002.09.03 |
| 6622A | Modification Recommended | 6622A-11 | Defective Cable | 2000.04.30 |
| 6622A | Modification Recommended | 6622A-12 | Intermittent Power Transformer “Magmate” Connections | 2002.09.03 |
| 6623A | Modification Recommended | 6623A-15 | Defective Cable | 2000.04.30 |
| 6623A | Modification Recommended | 6623A-16 | Intermittent Power Transformer “Magmate” Connections | 2002.09.04 |
| 6624A | Modification Recommended | 6624A-12 | Defective Cable | 2000.04.30 |
| 6624A | Modification Recommended | 6624A-13 | Intermittent Power Transformer “Magmate” Connections | 2002.09.04 |
| 6625A | Modification Recommended | 6625A-02 | Rec replacement of fuses improves performance | 1993.01.31 |
| 6625A | Modification Recommended | 6625A-10 | Defective Cable | 2000.04.30 |
| 6625A | Modification Recommended | 6625A-11 | Intermittent Power Transformer “Magmate” Connections | 2002.09.04 |
| 6626A | Modification Recommended | 6626A-02 | Rec replacement of fuses improves performance | 1993.01.31 |
| 6626A | Modification Recommended | 6626A-10 | Defective Cable | 2000.04.30 |
| 6626A | Modification Recommended | 6626A-11 | Intermittent Power Transformer “Magmate” Connections | 2002.09.04 |
| 6627A | Modification Recommended | 6627A-06 | Defective Cable | 2000.04.30 |
| 6627A | Modification Recommended | 6627A-07 | Intermittent Power Transformer “Magmate” Connections | 2002.09.04 |
| 6628A | Modification Recommended | 6628A-02 | Rec replacement of fuses improves performance | 1993.01.31 |
| 6628A | Modification Recommended | 6628A-10 | Defective Cable | 2000.04.30 |
| 6628A | Modification Recommended | 6628A-11 | Intermittent Power Transformer “Magmate” Connections | 2002.09.03 |
| 6629A | Modification Recommended | 6629A-02 | Rec replacement of fuses improves performance | 1993.01.31 |
| 6629A | Modification Recommended | 6629A-10 | Defective Cable | 2000.04.30 |
| 6629A | Modification Recommended | 6629A-11 | Intermittent Power Transformer “Magmate” Connections | 2002.09.04 |
| 6631B | Modification Recommended | 6631B-02A | Blank Front Panel Display,Unit Dead | 1999.08.09 |
| 6631B | Modification Recommended | 6631B-05B | Unit Exchange Program | 2001.01.31 |
| 6631B | Modification Recommended | 6631B-08 | On faster computers, when programming over GPIB, a random error will occur. | 2005.09.28 |
| 6632B | Modification Recommended | 6632B-01 | Low range current readback out of specifications | 1998.03.01 |
| 6632B | Modification Recommended | 6632B-02 | High current readback accuracy out of specification | 1998.10.13 |
| 6632B | Modification Recommended | 6632B-03A | Blank Front Panel Display,Unit Dead | 1999.08.09 |
| 6632B | Modification Recommended | 6632B-05B | Unit Exchange Program | 2001.01.31 |
| 6632B | Modification Recommended | 6632B-08 | On faster computers, when programming over GPIB, a random error will occur. | 2005.09.28 |
| 6632B | Modification Recommended | 6632B-09 | There is a possible glitch on the output due to an AC Line sag between 23 VAC to 27 VAC. | 2011.01.10 |
| 6632B | Modification Recommended | 6632B-020-01B | Unit exchange program | 2001.05.22 |
| 6632B | Modification Recommended | 6632B-020-01B | Unit Exchange Program | 2001.01.31 |
| 6632B | Modification Recommended | 6632B-760-01B | Unit exchange program | 2001.05.22 |
| 6632B | Modification Recommended | 6632B-760-01B | Unit Exchange Program | 2001.01.31 |
| 6633A | Modification Available | 6633A-02 | Bleeder resistor increases RFI filter capacitor discharge rate | 1993.12.31 |
| 6633B | Modification Recommended | 6633B-01 | Low range current readback out of specifications | 1998.03.01 |
| 6633B | Modification Recommended | 6633B-02 | High current readback accuracy out of specification | 1998.10.13 |
| 6633B | Modification Recommended | 6633B-03A | Blank Front Panel Display,Unit Dead | 1999.08.09 |
| 6633B | Modification Recommended | 6633B-05B | Unit Exchange Program | 2001.01.31 |
| 6633B | Modification Recommended | 6633B-08 | On faster computers, when programming over GPIB, a random error will occur. | 2005.09.28 |
| 6633B | Modification Recommended | 6633B-09 | There is a possible glitch on the output due to an AC Line sag between 23 VAC to 27 VAC. | 2011.01.10 |
| 6633B | Modification Recommended | 6633B-020-01B | Unit exchange program | 2001.05.22 |
| 6633B | Modification Recommended | 6633B-760-01B | Unit exchange program | 2001.05.22 |
| 6634B | Modification Recommended | 6634B-01 | Low range current readback out of specifications | 1998.03.01 |
| 6634B | Modification Recommended | 6634B-02 | High current readback accuracy out of specification | 1998.10.13 |
| 6634B | Modification Recommended | 6634B-03A | Blank Front Panel Display,Unit Dead | 1999.08.09 |
| 6634B | Modification Recommended | 6634B-05B | Unit Exchange Program | 2001.01.31 |
| 6634B | Modification Recommended | 6634B-08 | On faster computers, when programming over GPIB, a random error will occur. | 2005.09.28 |
| 6634B | Modification Recommended | 6634B-09 | There is a possible glitch on the output due to an AC Line sag between 23 VAC to 27 VAC. | 2011.01.10 |
| 6634B | Modification Recommended | 6634B-020-01B | Unit exchange program | 2001.05.22 |
| 6634B | Modification Recommended | 6634B-020-01B | Unit Exchange Program | 2001.01.31 |
| 6634B | Modification Recommended | 6634B-760-01B | Unit Exchange Program | 2001.01.31 |
| 6634B | Modification Recommended | 6634B-760-01B | Unit exchange program | 2001.05.22 |
| 6634B | Modification Recommended | 6634B-RECALL-10 | Calibrations performed on some Power Supplies by Agilent Technologies between July 1st, 2011 and July 31st, 2012 show a FALSE PASS in either one or more of the 4 tests: CC LOAD EFFECT, CV LOAD EFFECT, CC SOURCE EFFECT or CV SOURCE EFFECT. | 2012.08.19 |
| 6655A | Information Only | 6655A-03 | Modification to reduce Radiated RFI when replacing A2 GPIB board. | 1993.11.30 |
| 6655A | Information Only | 6655A-04 | Keypad board, Optical Encoders and Knobs have been changed and are not interchangeable with old parts | 1997-03 |
| 6655A | Information Only | 6655A-06B | Front Panel Parts List | 2002.06.28 |
| 6671A | Modification Recommended | 6671A-01B | Modification corrects relay link and eliminates error -240 | 1993.11.23 |
| 6671A | Modification Recommended | 6671A-02 | Mod prevents Error -240 when conn to HP 59510A/11A Relay Box | 1994.07.06 |
| 6671A | Modification Recommended | 6671A-05 | Intermittent Phone Cables | 1999.07.31 |
| 6671A | Modification Recommended | 6671A-08A | Upgrade for Unstable Current Shunt ""R907"" CC mode Operation | 2003.10.16 |
| 6671A | Modification Recommended | 6671A-10 | The four filter capacitors circuit reference (C416-C419) on the A4 AC input board starts leaking electrolyte | 2009.08.18 |
| 6671A | Modification Recommended | 6671A-11 | The AC INPUT SAFETY COVER has a strain relief used to secure the AC line cord that may become loose. | 2009.10.08 |
| 6671A | Modification Recommended | 6671A-13 | 6671A exhibited out of specification values for 3.5V to 4.0V at front panel read back readings | 2016.10.26 |
| 6672A | Modification Recommended | 6672A-01B | Modification corrects relay link and eliminates error -240 | 1993.11.23 |
| 6672A | Modification Recommended | 6672A-02 | Mod prevents Error -240 when conn to HP 59510A/11A Relay Box | 1994.07.06 |
| 6672A | Modification Recommended | 6672A-05 | Intermittent Phone Cables | 1999.07.31 |
| 6672A | Modification Recommended | 6672A-07A | Upgrade for Unstable Current Shunt ""R907"" | 2003.10.16 |
| 6672A | Modification Recommended | 6672A-08 | Slow or No Down Programming capability | 2006.07.30 |
| 6672A | Modification Recommended | 6672A-10 | The four filter capacitors circuit reference (C416-C419) on the A4 AC input board starts leaking electrolyte | 2009.08.18 |
| 6672A | Modification Recommended | 6672A-11 | The AC INPUT SAFETY COVER has a strain relief used to secure the AC line cord that may become loose. | 2009.10.08 |
| 6672A | Modification Recommended | 6672A-13 | 6672A exhibited out of specification values for 8.5V to 9.5V at front panel read back readings. | 2016.10.26 |
| 6673A | Modification Recommended | 6673A-01B | Modification corrects relay link and eliminates error -240 | 1993.11.23 |
| 6673A | Modification Recommended | 6673A-02 | Mod prevents Error -240 when conn to HP 59510A/11A Relay Box | 1994.07.06 |
| 6673A | Modification Recommended | 6673A-05 | Intermittent Phone Cables | 1999.07.31 |
| 6673A | Modification Recommended | 6673A-07A | Upgrade for ""Unstable"" Current Shunt ""R907"". | 2003.10.20 |
| 6673A | Modification Recommended | 6673A-09 | The four filter capacitors circuit reference (C416-C419) on the A4 AC input board starts leaking electrolyte | 2009.08.18 |
| 6673A | Modification Recommended | 6673A-10 | The AC INPUT SAFETY COVER has a strain relief used to secure the AC line cord that may become loose. | 2009.10.08 |
| 6673A | Modification Recommended | 6673A-12 | 6673A exhibited out of specification values for 14.5V to 16V and 26V to 27V at front panel read back readings | 2016.10.26 |
| 6674A | Modification Recommended | 6674A-01B | Modification corrects relay link and eliminates error -240 | 1993.11.23 |
| 6674A | Modification Recommended | 6674A-02 | Mod prevents Error -240 when conn to HP 59510A/11A Relay Box | 1994.07.06 |
| 6674A | Modification Recommended | 6674A-05 | Improper Crimps on Output Transformer & Choke | 1999.04.05 |
| 6674A | Modification Recommended | 6674A-06 | Intermittent Phone Cables | 1999.07.31 |
| 6674A | Modification Recommended | 6674A-09A | Upgrade for ""Unstable"" Current shunt ""R907"". | 2003.10.20 |
| 6674A | Modification Recommended | 6674A-11 | The four filter capacitors circuit reference (C416-C419) on the A4 AC input board starts leaking electrolyte | 2009.08.18 |
| 6674A | Modification Recommended | 6674A-12 | The AC INPUT SAFETY COVER has a strain relief used to secure the AC line cord that may become loose. | 2009.10.08 |
| 6674A | Modification Recommended | 6674A-14 | 6674A exhibited out of specification values for 24V to 28V and 44V to 46V at front panel read back readings. | 2016.10.26 |
| 6675A | Modification Recommended | 6675A-01B | Modification corrects relay link and eliminates error -240 | 1993.11.23 |
| 6675A | Modification Recommended | 6675A-02 | Modification improves reliability of sense protection resistors | 1993.01.31 |
| 6675A | Modification Recommended | 6675A-03 | Mod prevents Error -240 when conn to HP 59510A/11A Relay Box | 1994.07.06 |
| 6675A | Modification Recommended | 6675A-06 | Improper Crimps on Output Transformer & Choke | 1999.02.28 |
| 6675A | Modification Recommended | 6675A-07 | Intermittent phone cables | 1999.08.25 |
| 6675A | Modification Recommended | 6675A-09A | Upgrade for ""Unstable"" Current Shunt ""R907"". | 2003.10.20 |
| 6675A | Modification Recommended | 6675A-11 | The four filter capacitors circuit reference (C416-C419) on the A4 AC input board starts leaking electrolyte | 2009.08.18 |
| 6675A | Modification Recommended | 6675A-12 | The AC INPUT SAFETY COVER has a strain relief used to secure the AC line cord that may become loose. | 2009.10.08 |
| 6675A | Modification Recommended | 6675A-14 | 6675A exhibited out of specification values for 48V to 52V at front panel read back readings. | 2016.10.26 |
| 6680A | Modification Recommended | 6680A-03 | Intermittent Phone Cables | 1999.08.31 |
| 6680A | Modification Recommended | 6680A-04 | A9 Down Programmer Failures | 2000.05.02 |
| 6680A | Modification Recommended | 6680A-05 | Incorrect response to a query over GPIB | 2001.02.12 |
| 6680A | Modification Recommended | 6680A-08 | Shunt Resistor R900 has poor fast-on's. | 2004.02.24 |
| 6681A | Modification Recommended | 6681A-03 | Intermittent Phone Cables | 1999.08.31 |
| 6681A | Modification Recommended | 6681A-04 | A9 Down Programmer Failures | 2000.05.02 |
| 6681A | Modification Recommended | 6681A-05 | Incorrect response to a query over GPIB | 2001.02.12 |
| 6681A | Modification Recommended | 6681A-08 | Shunt Resistor R900 has poor fast-ons | 2004.02.24 |
| 6682A | Modification Recommended | 6682A-02 | Intermittent Phone Cables | 1999.08.31 |
| 6682A | Modification Recommended | 6682A-03 | A9 Down Programmer Failures | 2000.05.02 |
| 6682A | Modification Recommended | 6682A-04 | Incorrect response to a query over GPIB | 2001.02.12 |
| 6682A | Modification Recommended | 6682A-07 | Shunt Resistor R900 has poor fast-ons | 2004.02.24 |
| 6683A | Modification Recommended | 6683A-02 | Intermittent Phone Cables | 1999.08.31 |
| 6683A | Modification Recommended | 6683A-03 | A9 Down Programmer Failures | 2000.05.02 |
| 6683A | Modification Recommended | 6683A-04 | Incorrect response to a query over GPIB | 2001.02.12 |
| 6683A | Modification Recommended | 6683A-07 | Shunt Resistor R900 has poor fast-ons | 2004.02.24 |
| 6684A | Modification Recommended | 6684A-02 | Intermittent Phone Cables | 1999.08.31 |
| 6684A | Modification Recommended | 6684A-03 | A9 Down Programmer Failures | 2000.05.02 |
| 6684A | Modification Recommended | 6684A-04 | Incorrect response to a query over GPIB | 2001.02.12 |
| 6684A | Modification Recommended | 6684A-07 | Shunt resistor R900 has poor fast-ons. | 2004.02.24 |
| 6690A | Modification Recommended | 6690A-02 | Shunt Resistor R900 has poor fast-ons | 2004.02.24 |
| 6691A | Modification Recommended | 6691A-02 | Shunt Resistor R900 has poor fast-ons | 2004.02.24 |
| 6692A | Modification Recommended | 6692A-02 | Shunt Resistor R900 has poor fast-ons | 2004.02.24 |
| 6692A | Modification Recommended | 6692A-04 | Potential installation fault to users when the AC line cord is connected to the AC fuse holder/line cord module p/n 2110-1312 | 1899.12.30 |
| 6811B | Modification Recommended | 6811B-03 | The tin plating on four PCA connector headers and one cable can potentially oxidize, causing contact resistance to increase. Higher contact resistance will cause a bias voltage on that is present on the connector header to sag. This low voltage can cause the unit to intermittently reset when it is below a certain threshold. | 2009.02.19 |
| 6811B | Safety | 6811B-04A-S | Regulatory noncompliance with the option 901 (Power cord for Australia / New Zealand) | 2017.05.11 |
| 6812B | Modification Recommended | 6812B-03 | The tin plating on four PCA connector headers and one cable can potentially oxidize, causing contact resistance to increase. Higher contact resistance will cause a bias voltage on that is present on the connector header to sag. This low voltage can cause the unit to intermittently reset when it is below a certain threshold. | 2009.02.19 |
| 6812B | Modification Recommended | 6812B-04 | The AC INPUT SAFETY COVER has a strain relief used to secure the AC line cord that may become loose. | 2009.10.08 |
| 6813B | Modification Recommended | 6813B-03 | Possible intermittent cable assembly | 2000.11.02 |
| 6813B | Modification Recommended | 6813B-05 | The tin plating on four PCA connector headers and one cable can potentially oxidize, causing contact resistance to increase. Higher contact resistance will cause a bias voltage on that is present on the connector header to sag. This low voltage can cause the unit to intermittently reset when it is below a certain threshold. | 2009.02.19 |
| 6813B | Modification Recommended | 6813B-06 | The AC INPUT SAFETY COVER has a strain relief used to secure the AC line cord that may become loose. | 2009.10.08 |
| 6942A | Various | 06942-90001 | 6942A Multiprogrammer Service Notes Collection | 1987-01 |
| 7045B | Modification Recommended | 7045B-1 | IMPROVED X AND V AXIS ATTENUATOR ASSEMBLIES | 1981-08 |
| 8110A | Modification Recommended | 8110A-01 | Display failures (shifted lines and/or inverted display) | 2004.03.09 |
| 8114A | Modification Recommended | 8114A-01A | Modify Power Supply to fix problems at line voltage below 130V. | 2003.09.07 |
| 8114A | Modification Recommended | 8114A-02B | Intermittent display failures | 2006.06.28 |
| 8164A | Modification Recommended | 8164A-01 | 8164A Floppy Drive | 1999.08.31 |
| 8166A | Modification Recommended | 8166A-01A | Recommended MOV removal in power supply | 2001.04.01 |
| 8166B | Modification Recommended | 8166B-01 | Potential failure on backplane board | 2006.10.17 |
| 8169A | Modification Recommended | 8169A-01B | 8169A lockup problem patch and firmware upgrade. | 2002.04.28 |
| 8340A | Modification Available | 8340A-22 | Rear Panel to Front Panel Retrofit Instructions | 1993.01.06 |
| 8340A | Information Only | 8340A-M61A | Y2K update information. RMB support software update information. | 1998-12 |
| 8340A | Information Only | 8340A-M62A | Y2K update information. Microsoft Windows, Win 3.1, Win95 and Win98 software update information. | 1998-12 |
| 8340A | Information Only | 8340A-M63A | The Pascal operating environment has a defect related to the year 2000. | 1998-12 |
| 8340B | Modification Available | 8340B-05 | Rear Panel to Front Panel Retrofit Instructions | 1993.01.06 |
| 8340B | Information Only | 8340B-M61A | Y2K update information. RMB support software update information. | 1998-12 |
| 8340B | Information Only | 8340B-M62A | Y2K update information. Microsoft Windows, Win 3.1, Win95 and Win98 software update information. | 1998-12 |
| 8340B | Information Only | 8340B-M63A | The Pascal operating environment has a defect related to the year 2000. | 1998-12 |
| 8405A | Modification Available | 8405A-8A | Serial Prefix 2014A and Below - “APC UNLOCKED” Indicator Light Replacement | 1981-07 |
| 8444A | Modification Available | 8444A-4 | HP MODEL8444A OPTION 059 TRACKING GENERATOR Serial Prefix 2103A and Below Except for the Following Serial Numbers 03900,03932,03985,03986,03987, 03991,03992,03995,03996,03997, 04002,04006,04007,04008,04009,04010 - DEGRADED FREQUENCY RESPONSE PERFORMANCE FOR SWEEP TIMES LESS THAN 5 MSEC/DIV | 1982-03 |
| 8477A | Modification Recommended | 8477A-01A | 8477A not able to power up under 115V | 2014.03.18 |
| 8481A | Modification Recommended | 8481A-10 | In the Measurement report of 8481A, the Reference Calibration factor at 50MHz stated is inconsistent with the 50MHz Calibration Factor listed in the table. | 2016.10.26 |
| 8481D | Modification Recommended | 8481D-02 | Cal factor and reflection magnitude uncertainty values on factory calibration report are incoreect. | 2001.10.29 |
| 8494A | Modification Recommended | 8494A-01A | Step Attenuator knob modification | 2001.07.16 |
| 8494A | Modification Recommended | 8494A-02 | The identified batch of step attenuator’s rotating knob may become loose when the user applies an extended force to turn the knob beyond the maximum attenuation value. This will cause the attenuation value to be located outside of the indicator window and may create confusion on the actual attenuation value. | 2020.11.18 |
| 8494B | Modification Recommended | 8494B-01A | Step Attenuator knob modification | 2001.07.16 |
| 8494B | Modification Recommended | 8494B-02 | The identified batch of step attenuator’s rotating knob may become loose when the user applies an extended force to turn the knob beyond the maximum attenuation value. This will cause the attenuation value to be located outside of the indicator window and may create confusion on the actual attenuation value. | 2020.11.19 |
| 8495A | Modification Recommended | 8495A-01A | Step Attenuator knob modification | 2001.07.16 |
| 8495A | Modification Recommended | 8495A-02 | The identified batch of step attenuator’s rotating knob may become loose when the user applies an extended force to turn the knob beyond the maximum attenuation value. This will cause the attenuation value to be located outside of the indicator window and may create confusion on the actual attenuation value. | 2020.11.18 |
| 8495B | Modification Recommended | 8495B-01A | Step Attenuator knob modification | 2001.07.16 |
| 8495B | Modification Recommended | 8495B-02 | The identified batch of step attenuator’s rotating knob may become loose when the user applies an extended force to turn the knob beyond the maximum attenuation value. This will cause the attenuation value to be located outside of the indicator window and may create confusion on the actual attenuation value. | 2020.11.18 |
| 8495D | Modification Recommended | 8495D-01A | Step Attenuator knob modification | 2001.07.16 |
| 8495D | Modification Recommended | 8495D-02 | The identified batch of step attenuator’s rotating knob may become loose when the user applies an extended force to turn the knob beyond the maximum attenuation value. This will cause the attenuation value to be located outside of the indicator window and may create confusion on the actual attenuation value. | 2020.11.18 |
| 8496A | Modification Recommended | 8496A-01A | Step Attenuator knob modification | 2001.07.16 |
| 8496A | Modification Recommended | 8496A-02 | The identified batch of step attenuator’s rotating knob may become loose when the user applies an extended force to turn the knob beyond the maximum attenuation value. This will cause the attenuation value to be located outside of the indicator window and may create confusion on the actual attenuation value. | 2020.11.18 |
| 8496B | Modification Recommended | 8496B-01A | Step Attenuator knob modification | 2001.07.16 |
| 8496B | Modification Recommended | 8496B-02 | The identified batch of step attenuator’s rotating knob may become loose when the user applies an extended force to turn the knob beyond the maximum attenuation value. This will cause the attenuation value to be located outside of the indicator window and may create confusion on the actual attenuation value. | 2020.11.18 |
| 8501A | Information Only | 8501A-4 | ADJUSTMENT PROCEDURE FOR COMPATABILITY WITH THE MODEL 8754A NETWORK ANALYZER | 1980-10 |
| 8510B | Safety | 8510B-06A-S | Rear panel fan cutout and fan guard allow accessibility of fan blades to an IEC 61010 type test finger. | 2007.05.09 |
| 8510C | Modification Recommended | 8510C-01 | Floppy disk drive formating information. | 1999.10.31 |
| 8510C | Modification Recommended | 8510C-02A | 8510C firmware change from C.07.14 to C.07.16 | 2000.11.30 |
| 8510C | Safety | 8510C-03A-S | Rear panel fan cutout and fan guard allow accessibility of fan blades to an IEC 61010 type test finger. | 2007.05.09 |
| 8510C | Modification Recommended | 8510C-04 | Unreadable softkey labels and syntax errors when using Electronic Calibration Modules (Ecal). | 2002.09.22 |
| 8511A | Modification Recommended | 8511A-06 | Performance Software | 1999.10.31 |
| 8511A | Safety | 8511A-07A-S | Rear panel fan cutout and fan guard allow accessibility of fan blades to an IEC 61010 type test finger. | 2007.05.09 |
| 8511B | Modification Recommended | 8511B-01 | Performance Software | 1999.10.31 |
| 8511B | Safety | 8511B-02A-S | Rear panel fan cutout and fan guard allow accessibility of fan blades to an IEC 61010 type test finger. | 2007.05.09 |
| 8514B | Modification Recommended | 8514B-01 | D.C. Return Upgrade Kit | 1995.09.30 |
| 8514B | Safety | 8514B-05A-S | Rear panel fan cutout and fan guard allow accessibility of fan blades to an IEC 61010 type test finger. | 2007.05.09 |
| 8515A | Modification Recommended | 8515A-04 | D.C. Return Upgrade Kit | 1995.09.30 |
| 8515A | Safety | 8515A-06A-S | Rear panel fan cutout and fan guard allow accessibility of fan blades to an IEC 61010 type test finger. | 2007.05.09 |
| 8517A | Safety | 8517A-03A-S | Rear panel fan cutout and fan guard allow accessibility of fan blades to an IEC 61010 type test finger. | 2007.05.09 |
| 8517B | Modification Recommended | 8517B-01 | D.C. Return Upgrade Kit | 1995.09.30 |
| 8517B | Modification Recommended | 8517B-02 | Test Set Option 002 deletion | 1996.12.31 |
| 8517B | Safety | 8517B-03A-S | Rear panel fan cutout and fan guard allow accessibility of fan blades to an IEC 61010 type test finger. | 2007.05.09 |
| 8530A | Modification Recommended | 8530A-01 | Overspeed error when 85370A is used, or no display on 85370A | 1998.07.31 |
| 8555A | Modification Recommended | 8555A-1 | HP MODEL 8555A SPECTRUM ANALYZER, RF SECTION, Serials Prefixed 1232A and Below PRESELECTOR DPM MODIFICATION | unknown |
| 8558B | Modification Recommended | 8558B-1 | BANDWIDTH FILTER BOARD REP4ACEMENT | 1974-01 |
| 8558B | Modification Recommended | 8558B-2 | Serials Prefixed 1321 A and Below – IMPROVED FREQUENCY TUNING POT | 1974-01 |
| 8558B | Modification Recommended | 8558B-3 | Serials Prefixed 1334A and Below – PREVENTION OF SINGLE SWEEP TRIGGERING BY ERASE FUNCTION TRANSIENTS | 1974-02 |
| 8558B | Modification Recommended | 8558B-4 | Serials Prefixed 1334A and Below – NEW FRONT PANEL LATCH HOUSING | 1974-02 |
| 8560E | Priority Safety | 8560E-18-S | Possible Shoulder Strap Failure Under Load | 1998.07.31 |
| 8560EC | Modification Recommended | 8560EC-02 | Possible 60 Hz related sidebands | 2001.07.16 |
| 8560EC | Modification Recommended | 8560EC-04 | A butch on the A5 IF board to possible remove error messages 561, 562, and 565 | 2002.02.07 |
| 8560EC | Modification Recommended | 8560EC-05 | Replace A2 board to remove spikes on falling edges of a square pulse | 2002.02.07 |
| 8560EC | Modification Recommended | 8560EC-08 | Unstable Noise Floor and/or 500 series Error Messages | 2006.03.26 |
| 8560EC | Modification Recommended | 8560EC-12-RECALL | Calibrations performed on some Spectrum Analyzers by Agilent Technologies between January 01, 2010 and 02 February 2012 show a false pass in the test summary for the frequency response band 0 test. | 2012.03.13 |
| 8561B | Modification Recommended | 8561B-16 | Modification prevents possible damage to video out buffer on A2 interface | 1993.02.28 |
| 8561E | Priority Safety | 8561E-14-S | Possible Shoulder Strap Failure Under Load | 1998.07.31 |
| 8561EC | Modification Recommended | 8561EC-09-RECALL | Calibrations performed on some Spectrum Analyzers by Agilent Technologies between January 01, 2010 and 02 February 2012 show a false pass in the test summary for the frequency response band 0 test. | 2012.03.13 |
| 8562E | Priority Safety | 8562E-06-S | Possible Shoulder Strap Failure Under Load | 1998.07.31 |
| 8562EC | Modification Recommended | 8562EC-03 | Possible 60 Hz related sidebands | 2001.07.16 |
| 8562EC | Modification Recommended | 8562EC-04 | A butch on the A5 IF board to possible remove error messages 561, 562, and 565 | 2002.02.07 |
| 8562EC | Modification Recommended | 8562EC-05 | Replace A2 board to remove spikes on falling edges of a square pulse | 2002.02.07 |
| 8562EC | Modification Recommended | 8562EC-08 | Unstable Noise Floor and/or 500 series Error Messages | 2006.03.26 |
| 8563E | Modification Recommended | 8563E-26-RECALL | Calibrations performed on some Spectrum Analyzers by Agilent Technologies between January 01, 2010 and 02 February 2012 show a false pass in the test summary for the frequency response band 0 test. | 2012.03.13 |
| 8563E | Information Only | 8563E-25 | New A15 RF Board Replacement Part Numbers | 2004.12.20 |
| 8563E | Modification Recommended | 8563E-24A | Possible Failure of A6A1 High Voltage Module | 1999-03 |
| 8563E | Information Only | 8563E-23 | A1A2 RPG Assembly and A1 Keyboard Part Number Change | 1999-01 |
| 8563E | Modification Recommended | 8563E-22 | A15 Assembly Shield Can Load Down Supply | 1999-05 |
| 8563E | Modification Available | 8563E-21 | 12.4 GHz Signal on 310.7 MHz IF Output | 1999.02.17 |
| 8563E | Modification Recommended | 8563E-19C | Year 2K Update Information | 1999.01.20 |
| 8563E | Priority Safety | 8563E-18-S | Possible Shoulder Strap Failure Under Load | 1998.07.31 |
| 8563E | Modification Recommended | 8563E-17 | Reducing 300 kHz Sidebands | 1997-12 |
| 8563E | Modification Recommended | 8563E-16 | Intermittent Error 337 (Frac-N Unlock) Under Certain Conditions | 1997-07 |
| 8563E | Modification Recommended | 8563E-15 | Intermittent Error 335 Sampler Unlock | 1997-03 |
| 8563E | Modification Recommended | 8563E-14 | A17 CRT Driver Reliability Improvement | 1996-10 |
| 8563E | Modification Recommended | 8563E-13 | Intermittent flashing display intensity | 1996-01 |
| 8563E | Information Only | 8563E-12 | VCO adjustment for later “1X6” A15 RF assemblies | 1996-01 |
| 8563E | Modification Recommended | 8563E-10C | Possible Frequency Response Drift | 2000-06 |
| 8563E | Modification Recommended | 8563E-10D | Possible Frequency Response Drift | 2003.11.11 |
| 8563E | Modification Recommended | 8563E-09 | High displayed average noise level in wide bandwidths | 1994-05 |
| 8563E | Modification Recommended | 8563E-08 | 5-Volt Regulator Reliability Improvement on A6 | 1993.11.24 |
| 8563E | Modification Available | 8563E-07A | Modification to improve focus reliability | 1996-08 |
| 8563E | Modification Available | 8563E-06 | I.F. errors falsely displayed at cold temperatures before OCXO is warmed up | 1993.09.08 |
| 8563E | Modification Available | 8563E-04L | Firmware Upgrade Kit and Information | 1999-11 |
| 8563E | Modification Recommended | 8563E-02C | Defective 5-volt regulators on A6 power supply and A14 frequency control assemblies | 1994.01.10 |
| 8563E | Modification Recommended | 8563E-01A | Modification for Intermittent sampler unlock errors | 1993.02.05 |
| 8563E | Information Only | 8563E-M62A | Y2K update information. Microsoft Windows, Win 3.1, Win95 and Win98 software update information. | 1998-12 |
| 8563E | Information Only | 8563E-M63A | The Pascal operating environment has a defect related to the year 2000. | 1998-12 |
| 8563E | Modification Recommended | 8563E-M71 | Tightening torque on p/n 08673-60040 APC 3.5mm(m)to(f) connector. | 1999-02 |
| 8563EC | Modification Recommended | 8563EC-02 | Possible Frequency Response Drift | 2000-06 |
| 8563EC | Modification Recommended | 8563EC-02B | Possible Frequency Response Drift | 2003.11.11 |
| 8563EC | Modification Recommended | 8563EC-03 | Possible 60 Hz related sidebands | 2001.07.16 |
| 8563EC | Modification Recommended | 8563EC-04 | A butch on the A5 IF board to possible remove error messages 561, 562, and 565 | 2002.02.07 |
| 8563EC | Modification Recommended | 8563EC-05 | Replace A2 board to remove spikes on falling edges of a square pulse | 2002.02.07 |
| 8563EC | Modification Recommended | 8563EC-06 | Perform butch on A3 interface board to remove gated video problems | 2002.03.13 |
| 8563EC | Information Only | 8563EC-07 | New A15 RF Board Replacement Part Numbers | 2004.12.20 |
| 8563EC | Modification Recommended | 8563EC-08 | Unstable Noise Floor and/or 500 series Error Messages | 2006.03.26 |
| 8563EC | Modification Recommended | 8563EC-11-RECALL | Calibrations performed on some Spectrum Analyzers by Agilent Technologies between January 01, 2010 and 02 February 2012 show a false pass in the test summary for the frequency response band 0 test. | 2012.03.15 |
| 8563ER | Modification Recommended | 8563ER-19C | Year 2K Update Information | 1999.01.20 |
| 8563ER | Information Only | 8563ER-M61A | Y2K update information. RMB support software update information. | 1998-12 |
| 8563ER | Information Only | 8563ER-M62A | Y2K update information. Microsoft Windows, Win 3.1, Win95 and Win98 software update information. | 1998-12 |
| 8563ER | Information Only | 8563ER-M63A | The Pascal operating environment has a defect related to the year 2000. | 1998-12 |
| 8564E | Priority Safety | 8564E-12-S | Possible Shoulder Strap Failure Under Load | 1998.07.31 |
| 8564EC | Modification Recommended | 8564EC-03 | Possible 60 Hz related sidebands | 2001.07.16 |
| 8564EC | Modification Recommended | 8564EC-04 | A butch on the A5 IF board to possible remove error messages 561, 562, and 565 | 2002.02.07 |
| 8564EC | Modification Recommended | 8564EC-05 | Replace A2 board to remove spikes on falling edges of a square pulse | 2002.02.07 |
| 8564EC | Modification Recommended | 8564EC-08 | Unstable Noise Floor and/or 500 series Error Messages | 2006.03.26 |
| 8565A | Modification Recommended | 8565A-7 | Serials Prefixed 2027 A and Below – THIRD CONVERTER ASSEMBL V REPLACEMENT KIT | 1981-06 |
| 8565A | Modification Recommended | 8565A-10 | IMPROVED FREQUENCY RESPONSE PERFORMANCE TEST | 1981-04 |
| 8565A | Modification Recommended | 8565A-11 | FUSED 30V POWER SUPPLY | 1981-06 |
| 8565E | Priority Safety | 8565E-12-S | Possible Shoulder Strap Failure Under Load | 1998.07.31 |
| 8565EC | Modification Recommended | 8565EC-02B | Possible Frequency Response Drift | 2003.11.11 |
| 8565EC | Modification Recommended | 8565EC-03 | Possible 60 Hz related sidebands | 2001.07.16 |
| 8565EC | Modification Recommended | 8565EC-04 | A butch on the A5 IF board to possible remove error messages 561, 562, and 565 | 2002.02.07 |
| 8565EC | Modification Recommended | 8565EC-05 | Replace A2 board to remove spikes on falling edges of a square pulse | 2002.02.07 |
| 8565EC | Modification Recommended | 8565EC-06 | Perform butch on A3 interface board to remove gated video problems | 2002.03.13 |
| 8565EC | Information Only | 8565EC-07 | New A15 RF Board Replacement Part Numbers | 2004.12.20 |
| 8565EC | Modification Recommended | 8565EC-08 | Unstable Noise Floor and/or 500 series Error Messages | 2006.03.26 |
| 8565EC | Modification Recommended | 8565EC-11-RECALL | Calibrations performed on some Spectrum Analyzers by Agilent Technologies between January 01, 2010 and 02 February 2012 show a false pass in the test summary for the frequency response band 0 test. | 2012.03.13 |
| 8566A | Modification Recommended | 8566A-7 | IF Section Serial Prefix 1928A and Below – MODIFICATION TO IMPROVE MAGNETIC SUSCEPTIBILITY OF DISPLAY | 1980-02 |
| 8566A | Modification Recommended | 8566A-15 | FIELD INSTALLATlON OF OPTION 650 | 1981-05 |
| 8566A | Modification Recommended | 8566A-16 | RF ATTENUATOR WITH CALIBRATION ROM REPLACEMENT | 1981-05 |
| 8566A | Information Only | 8566A-1981 | 8566A and 8568A FAN FILTERS | 1981-04 |
| 8566B | Information Only | 8566B-01 | Rack Mounting with Slides (Option 010); English System II Cabinet Parts | 1985-05 |
| 8566B | Information Only | 8566B-02 | Rack Mounting with Slides (Option 010); Metric System II Cabinet Parts | 1985-05 |
| 8566B | Information Only | 8566B-05 | Repair and replacement of A5A2 Rotary Pulse Generator | 1992.12.09 |
| 8566B | Information Only | 8566B-10B | Option 462 6 dB resolution bandwidths | 1993.12.21 |
| 8566B | Modification Available | 8566B-11B | A15 Controller Assembly Firmware Replacement Kit | 1989.11.13 |
| 8566B | Information Only | 8566B-12A | Installation Procedure for Rebuilt A15 Controller Assembly | 1987-08 |
| 8566B | Modification Recommended | 8566B-19 | Replacement RF Attenuator Retrofit Kit with Calibration PROM | 1987-11 |
| 8566B | Modification Available | 8566B-19A | RF Attenuator with Calibration ROM Replacement | 1993.03.02 |
| 8566B | Modification Recommended | 8566B-20 | Misloaded Capacitor Exposed to 130% of Its Rating | 1990.05.25 |
| 8566B | Modification Recommended | 8566B-33 | Oven Oscillator Thermal Fuse Failure | 1990.04.10 |
| 8566B | Information Only | 8566B-37 | New A4A1 Video Processor | 1991.12.04 |
| 8566B | Modification Recommended | 8566B-39 | Intermittent PC Edge Connectors on A4A4 Bandwidth Filter Assembly | 1993.02.20 |
| 8566B | Information Only | 8566B-40 | Spurious Responses in Low Band | 1997-07 |
| 8566B | Information Only | 8566B-41 | Recommended replacement for A10A6U2 OP AMP | 1994-10 |
| 8566B | Information Only | 8566B-42 | RF Section Fan Motor Replacement | 1996-01 |
| 8567A | Modification Recommended | 8567A-04 | Misloaded Capacitor Exposed to 130% of Its Rating | 1990.05.25 |
| 8567A | Modification Recommended | 8567A-11A | Frequency Spur Correction | 1989.12.21 |
| 8568A | Information Only | 8568A-1-82 | KEYBOARD SWITCH FAILURES (FLYING SPRING SYNDROME) | 1982-02 |
| 8568A | Modification Recommended | 8568A-20 | IF Section Serial Prefix 1928A and Below – MODIFICATION TO IMPROVE MAGNETIC SUSCEPTIBILITY OF DISPLAY | 1980-02 |
| 8568A | Information Only | 8568A-25 | USING THE 8444A TRACKING GENERATOR – WITH THE 8568A SPECTRUM ANALYZER | 1980-03 |
| 8568A | Modification Recommended | 8568A-28 | IF Section Serial Prefix 2005A and Below; RF Section Serial Prefix 1921A and Below – 3 MHz RESOLUTION BANDWIDTH | 1980-03 |
| 8568A | Modification Recommended | 8568A-37 | All Serial Prefixes – RF ATTENUATOR WITH CALIBRATION ROM REPLACEMENT | 1980-08 |
| 8568A | Modification Recommended | 8568A-46A | Frequency Spur Correction | 1989.12.21 |
| 8568A | Information Only | 8568A-1981 | 8566A and 8568A FAN FILTERS | 1981-04 |
| 8568B | Information Only | 8568B-01 | Rack Mounting with Slides (Option 010); English System II Cabinet Parts | 1985-05 |
| 8568B | Information Only | 8568B-02 | Rack Mounting with Slides (Option 010); Metric System II Cabinet Parts | 1985-05 |
| 8568B | Modification Recommended | 8568B-04A | Frequency Spur Correction | 1989.12.21 |
| 8568B | Information Only | 8568B-10B | Option 462 6dB Resolution Bandwidths | 1993.12.21 |
| 8568B | Modification Available | 8568B-11B | A15 Controller Assembly Firmware Replacement Kit | 1989.11.13 |
| 8568B | Information Only | 8568B-12A | Installation Procedure for Rebuilt A15 Controller Assembly | 1987-08 |
| 8568B | Modification Recommended | 8568B-14 | Misloaded Capacitor Exposed to 130% of Its Rating | 1990.05.25 |
| 8568B | Modification Available | 8568B-21 | LO Amplifier Replacement Kit | 1989.12.06 |
| 8568B | Information Only | 8568B-25 | New Cooling Fans for the 8568B Spectrum Analyzer | 1991.09.26 |
| 8568B | Modification Recommended | 8568B-27 | Oven Oscillator Thermal Fuse Failure | 1990.04.10 |
| 8568B | Modification Recommended | 8568B-28 | Surface-Acoustic-Wave Resonator Failures | 1990.04.12 |
| 8568B | Information Only | 8568B-31 | New A4A1 Video Processor | 1990.12.04 |
| 8568B | Information Only | 8568B-35 | RF Section Fan Motor Replacement | 1996-01 |
| 8568B | Information Only | 8568B-41 | Recommended replacement for A10A6U2 OP AMP | 1994-04 |
| 8590L | Priority Safety | 8590L-09-S | Possible Shoulder Strap Failure Under Load | 1998.07.31 |
| 8591E | Priority Safety | 8591E-14-S | Possible Shoulder Strap Failure Under Load | 1998.07.31 |
| 8592L | Priority Safety | 8592L-07-S | Possible Shoulder Strap Failure Under Load | 1998.07.31 |
| 8593E | Priority Safety | 8593E-15-S | Possible Shoulder Strap Failure Under Load | 1998.07.31 |
| 8594E | Priority Safety | 8594E-14-S | Possible Shoulder Strap Failure Under Load | 1998.07.31 |
| 8595E | Priority Safety | 8595E-14-S | Possible Shoulder Strap Failure Under Load | 1998.07.31 |
| 8596E | Priority Safety | 8596E-14-S | Possible Shoulder Strap Failure Under Load | 1998.07.31 |
| 8620A | Modification Required | 8620A-6B | Modification Required for Compatibility with 86290A, 2.0-18.0 Ghz RF Plug-In or 8410B Network Analyzer | 1975-04 |
| 8620B | Modification Required | 8620B-3 | Modification Required for 86290A 2.0-18.0 GHz Plug-In Compatibility | 1974-09 |
| 8642M | Modification Recommended | 8642M-03A | Procedure to Resolve A11 and A12 Module Failures | 1992.07.10 |
| 8648A | Modification Recommended | 8648A-01A | Firmware defect repair for 8648A opt 1EP | 2009.05.04 |
| 8648A | Modification Recommended | 8648A-02B | Procedure to replace defective 864X display module | 2009.10.21 |
| 8648B | Modification Recommended | 8648B-02B | Procedure to replace defective 864X display module | 2009.10.21 |
| 8648C | Modification Recommended | 8648C-02B | Procedure to replace defective 864X display module | 2009.10.21 |
| 8648D | Modification Recommended | 8648D-02B | Procedure to replace defective 864X display module | 2009.10.21 |
| 8654A | Modification Recommended | P-08654-60047 | Serial Prefix 1530A and Below MICROPHONICS REDUCTION KIT | 1975-12 |
| 8654B | Information Only | 8654B-1 | IMPROVED PERFORMANCE TESTS AND ADJUSTMENTS USING THE 8901A | 1980-12 |
| 8656A | Modification Recommended | 8656A-10A | Serials Prefixed 2124A and Below – MODIFICATION to CORRECT for SPURIOUS SIDEBANDS 60·110 MHz VCO | 1981-09 |
| 8662A | Modification Recommended | 8662A-12E | Modification Kit to correct Error 03/04 conditions. | 1992.04.07 |
| 8662A | Modification Recommended | 8662A-17A | Synthesised Signal Generator VCO (08662-60485) failures | 1998-08 |
| 8662A | Modification Recommended | 8662A-18 | Procedure to resolve A7A4 (08662-60376) C2 and C3 leakage | 1999-03 |
| 8662A | Modification Recommended | 8662A-19 | Procedure to resolve 2-4 MHz spurs out from 640-1280 MHz carrier | 1999-07 |
| 8662A | Modification Recommended | 8662A-20 | Procedure to resolve 230V misprinted fuse rating on fuse plate. | 2000-03 |
| 8662A | Modification Recommended | 8662A-21 | Procedure to resolve A7A3C10 polarity misprinted. | 2000-09 |
| 8663A | Modification Recommended | 8663A-06E | Modification Kit to correct Error 03/04 conditions. | 1992.04.03 |
| 8663A | Modification Recommended | 8663A-11A | Synthesised Signal Generator VCO (08662-60485) failures | 1998-08 |
| 8663A | Modification Recommended | 8663A-13 | Procedure to resolve 2-4 MHz spurs out from 640-1280 MHz carrier | 1999-07 |
| 8663A | Modification Recommended | 8663A-14 | Procedure to resolve 230V misprinted fuse rating on fuse plate. | 2000-03 |
| 8663A | Modification Recommended | 8663A-15 | Procedure to resolve A7A3C10 polarity misprinted. | 2000-09 |
| 8690A | Modification Recommended | 8690A-1 | RECOMMENDED REPLACEMENT FOR A3V5 | 1967-03 |
| 8690A | Modification Recommended | 8690A-2A | RECIPROCAL AMPLIFIER IMPROVEMENTS | 1969-03 |
| 8690A | Modification Recommended | 8690A-3 | RECOMMENDED REPLACEMENT TRANSISTOR | 1967-09 |
| 8690A | Modification Recommended | 8690A-4 | REPLACEMENT PUSHBUTTONS | 1967-09 |
| 8690A | Modification Recommended | 8690A-5 | FAN NOISE REDUCTION | 1967-09 |
| 8690A | Modification Recommended | 8690A-6 | MODIFICATION FOR USE WITH HP MODEL 8706A AND 8707A | 1967-11 |
| 8690A | Modification Recommended | 8690A-7 | A modification of the circuit wiring of 8690A Sweep Oscillators, serials below 641-00261, is required for compatibility of these instruments with RF Units with Serial Prefix 724- and above. | 1967-11 |
| 8690A | Modification Recommended | 8690A-8 | IMPROVED PEN LIFT RELAY KIT | 1968-05 |
| 8690A | Modification Recommended | 8690A-9 | Improved Power Supply Reliability & Improved Square Wave Symmetry. | 1968-06 |
| 8690A | Modification Recommended | 8690A-10 | Serials 803-02061 to 818-02430 - MISSING CONNECTION ON A3 RECIPROCAL AMPLIFIER BOARD | 1968-03 |
| 8690A | Modification Recommended | 8690A-11 | RECOMMENDED REPLACEMENT FOR 8690A: A3V4, A4V1, A4V2, A4V4 8690B: A4V1, A4V2, A4V4 | 1969-03 |
| 8690A | Modification Recommended | 8690A-12 | REPLACEMENT OF CAPACITORS CONTAINING PCB | 1973-02 |
| 8690A | Modification Recommended | 8690A-12A | REPLACEMENT OF CAPACITORS CONTAINING PCB | 1973-05 |
| 8690A | Modification Recommended | 8690A-13 | RECOMMENDED REPLACEMENT FOR A8C4 AND A8C5 | 1974-03 |
| 8690A | Information Only | 8690A-1967 | Power Meter Leveling the 8690A Sweep Oscillator | 1967-02 |
| 8690A | Modification Recommended | 8690A-670726 | Incompatibility with RF Units, Prefix 724- and above | 1967.07.26 |
| 8690A | Modification Recommended | P-08690-6029 | HELIX AMPLIFIER MODIFICATION KIT | 1971-11 |
| 8690A | Modification Recommended | P-08690-6029-67 | HELIX AMPLIFIER MODIFICATION KIT | 1967-10 |
| 8690A | Modification Recommended | P-08690-6043 | Serials Below 803-2061 Improved +27 5 V /-300 V Power Supplies | 1968-04 |
| 8690A/B | Modification Recommended | 8690A-1968 | Power Meter Leveling HP Model 8690A/B Sweep Oscillators | 1968.12.31 |
| 8690A/B | Modification Recommended | P-08690-60053 | HIGH VOLTAGE POWER SUPPLY BOARD ASSEMBLY - IMPROVED TIME DELAY CIRCUIT | 1971-12 |
| 8690A/B | Modification Recommended | P-9100-2882 | IMPROVE RESIDUAL FM WITH NEW REPLACEMENT POWER TRANSFORMER | 1970-01 |
| 8690B | Modification Recommended | 8690B-1 | Serials 803-02061 to 818-02430 - MISSING CONNECTION ON A3 RECIPROCAL AMPLIFIER BOARD | 1968-03 |
| 8690B | Safety | 8690B-1-70 | POSSIBLE SAFETY HAZARD. | 1970-08 |
| 8690B | Modification Recommended | 8690B-2 | RECOMMENDED REPLACEMENT FOR 8690A: A3V4, A4V1, A4V2, A4V4 8690B: A4V1, A4V2, A4V4 | 1969-03 |
| 8690B | Modification Recommended | 8690B-3 | TIGHTEN 8690B VOLTAGE ADJUSTMENT TOLERANCES | 1969-12 |
| 8690B | Modification Recommended | 8690B-4 | RECOMMENDED REPLACEMENTS for TRANSISTOR A1403 AND RESISTOR A3R63 | 1970-01 |
| 8690B | Modification Recommended | 8690B-5 | MODIFICATION TO IMPROVE LINE SYNC TRIGGERING | 1971-03 |
| 8690B | Modification Recommended | 8690B-6 | MODIFICATIONS TO IMPROVE RELIABILITY | 1972-01 |
| 8690B | Modification Recommended | 8690B-7 | REPLACEMENT OF CAPACITORS CONTAINING PCB | 1973-02 |
| 8690B | Modification Recommended | 8690B-8 | RECOMMENDED REPLACEMENT FOR A8R14 | 1974-03 |
| 8690B | Modification Recommended | 8690B-9 | RECOMMENDED REPLACEMENT FOR A8C4 and A8C5 | 1974-03 |
| 8690B | Modification Recommended | 8690B-U-3 | TIGHTEN 8690B VOLTAGE ADJUSTMENT TOLERANCES | 1970-02 |
| 8698B | Modification Recommended | 8698B-1 | TIGHTEN 8690B VOLTAGE ADJUSTMENT TOLERANCES | 1969-12 |
| 8699B | Modification Recommended | 8699B-1 | TIGHTEN 8690B VOLTAGE ADJUSTMENT TOLERANCES | 1969-12 |
| 8751A | Modification Recommended | 8751A-17 | Modification to fix unexptected spurious problem. | 1995.04.15 |
| 8751A | Modification Recommended | 8751A-18 | Firmware Upgrade Improves Performance and Corrects Known Problems Described in Table 1 | 1992.01.30 |
| 8753ES | Modification Recommended | 8753ES-03B | Old A10 (8753-60095) board causes points to be dropped from trace, if U28 was manufactured by Fairchild. | 2008.06.02 |
| 8753ET | Modification Recommended | 8753ET-01A | Old A10 (08753-60095) board causes points to be dropped from trace, | 2001.10.31 |
| 8757D | Modification Recommended | 8757D-01 | The 8757D logger boards (A7-A10; P/N 08757-60146) have a reference diode that has excessive temperature drift. This drift may cause the dynamic accuracy test (as measured by the 11613A/B) to fail. | 2008.08.17 |
| 8902A | Modification Available | 8902A-VAR | Service Notes Collection for the 8902A Measuring Receiver | 1986-10 |
| 8904A | Modification Recommended | 8904A-04 | Replacement of Audio Transformer to Correct Inverted Waveform | 1992.01.01 |
| 8904A | Information Only | 8904A-05 | 8904A Multifunction Synthesizer Procedure For Restoring RAM Data | 1993.09.24 |
| 8921A | Modification Recommended | 8921A-01 | H/W and F/W upgrade required for 83201A compatibility | 1993.06.09 |
| 8921A | Modification Recommended | 8921A-02 | Rec mod corrects tone/digital signaling functionality | 1993.12.31 |
| 8921A | Modification Recommended | 8921A-03 | New F/W A.10.07 corrects erroneous self text diagnostic results | 1993.11.23 |
| 8921A | Modification Recommended | 8921A-05 | Cooling fan's shield can become loose or fall off | 1996.09.12 |
| 8922M | Safety | 8922M-09-S | Possible Shock Hazard, return to Agilent for Electrical safety (hi-pot) test, earth continuity test, and dielectric voltage (flash test) | 2000.01.31 |
| 8922P | Safety | 8922P-06-S | Possible Shock Hazard, return to Agilent for Electrical safety (hi-pot) test, earth continuity test, and dielectric voltage (flash test) | 2000.01.31 |
| 8922R | Safety | 8922R-03-S | Possible Shock Hazard, return to Agilent for Electrical safety (hi-pot) test, earth continuity test, and dielectric voltage (flash test) | 2000.01.31 |
| 8922S | Safety | 8922S-04-S | Possible Shock Hazard, return to Agilent for Electrical safety (hi-pot) test, earth continuity test, and dielectric voltage (flash test) | 2000.01.31 |
| 8922X | Safety | 8922X-06-S | Possible Shock Hazard, return to Agilent for Electrical safety (hi-pot) test, earth continuity test, and dielectric voltage (flash test) | 2000.01.31 |
| 8922Y | Safety | 8922Y-03-S | Possible Shock Hazard, return to Agilent for Electrical safety (hi-pot) test, earth continuity test, and dielectric voltage (flash test) | 2000.01.31 |
| 8970B | Information Only | 8970B-06 | New A14 Microprocessor Assembly | 1992.08.18 |
| 8970B | Information Only | 8970B-07 | Spurious Response and Jitter Specification Changed | 1992.08.27 |
| 8970B | Information Only | 8970B-10 | New more robust A6 Input Assembly for Option 020 | 1998-08 |
| 8970B | Information Only | 8970B-11 | Change to Input Power Detector Gain and Offset Adjustment Procedure | 1999-01 |
| 8970B | Information Only | 8970B-12 | Main Differences between Standard 8970B and 8970B Option 020 | 1999-01 |
| 8970B | Information Only | 8970B-13 | Agilent 8970B Noise Figure Meter | 2004.05.21 |
| 8990B | Modification Available | 8990B-01 | Window XP upgrade to Window 7 | 2014.05.15 |
| 8990B | Modification Recommended | 8990B-02 | Unresponsive knobs on 8990B front panel. | 2015.10.20 |
| 8990B | Modification Recommended | 8990B-03 | Peak Power Analyzer shuts off for no apparent reason | 2017.09.20 |
| 10762B | Modification Recommended | 10762B-01 | Switches S1, S2 and S3 may be subject to early failure | 1993.12.31 |
| 10887B | Modification Recommended | 10887B-01 | New IC sockets prevent FPGAs from falling out | 1994.10.10 |
| 10887P | Modification Recommended | 10887P-01 | New IC sockets prevent FPGAs from falling out | 1994.10.10 |
| 10889B | Modification Recommended | 10889B-01 | Resoldering address switch S2 corrects intermittents | 1995.07.27 |
| 11713A | Modification Recommended | 11713A-02 | Modification reduces noise susceptibility | 1993.12.31 |
| 11713B | Modification Recommended | 11713B-08 | 11713B Attenuation/Switch Driver could have built with PSU cover (PN 11713-00033) with wrong insulator placement. | 2021.01.24 |
| 11713C | Modification Recommended | 11713C-08 | 11713C Attenuation/Switch Driver could have built with PSU cover (PN 11713-00033) with wrong insulator placement. | 2021.01.24 |
| 11729C | Modification Recommended | 11729C-04 | Isolator (AT2) Replacement | 1993.08.27 |
| 16008B | Modification Recommended | 16008B-02 | Rec repl of main electrode if cond elastomer sheet is loose | 1994.07.06 |
| 16089B | Information Only | 16089B-01 | This service note provides the updated part numbers and figures for both RoHS and non-RoHS 16089B Medium Kelvin Clip Lead | 2012.11.19 |
| 16092A | Modification Available | 16092A-01 | New metal clips improve contact repeatability | 1993.12.12 |
| 16092A | Modification Recommended | 16092A-03 | The conductivity of the defective holder (16092-40616) causes the Q measurement abnormally | 2013.05.28 |
| 16197A | Modification Recommended | 16197A-01 | Dimensional distortion of the contact assembly interferes with operations. | 2004.06.29 |
| 16198A | Modification Available | 16198A-01 | The screws which fix the DUT cover and PC board strip out | 2019.01.08 |
| 16339A | Modification Recommended | 16339A-01 | Modification to correct a misassembled arm plate in SMD module | 1992.07.31 |
| 16339A | Modification Recommended | 16339A-02 | New miniature banana-plug cable wire eliminates breakage | 1993.05.31 |
| 16380C | Modification Recommended | 16380C-01 | Mod prevents potential damage to the carrying case | 1993.03.31 |
| 16441A | Modification Recommended | 16441A-01 | Mod corrects abnorm measumnts using R-Box & Kelvin-Triax cbls | 1994.08.04 |
| 16452A | Information Only | 16452A-02 | 16452A Connector Part Number change | 2023.04.05 |
| 16555A | Modification Recommended | 16555A-02 | Mod corrects Master/Expander operation | 1995.10.31 |
| 16903A | Modification Recommended | 16903A-01 | Upgrades of CPU motherboard, Main Interface Board,(MIB), and PCI board to improve system reliability. | 2004.11.02 |
| 18281A | Modification Recommended | 18281A-02 | Mod to remove PS3 to prevent network crashes | 1993.12.12 |
| 18282A | Modification Recommended | 18282A-01 | Exchange board fixes misloaded capacitors | 1992.02.29 |
| 18283A | Modification Recommended | 18283A-01 | Exchange board fixes misloaded capacitors | 1992.02.29 |
| 18284A | Modification Recommended | 18284A-01 | Exchange board fixes misloaded capacitors | 1992.02.29 |
| 33220A | Modification Recommended | 33220A-01 | Updating Firmware may result in Corrupt Memory | 2006.08.23 |
| 33220A | Modification Recommended | 33220A-02C | Encoder May Be Subject to Early Failure | 2012.03.13 |
| 33220A | Modification Recommended | 33220A-03 | Flatness Calibration Error | 2009.08.06 |
| 33220A | Modification Recommended | 33220A-03 | Flatness Calibration Error | 2009.08.24 |
| 33250A | Modification Recommended | 33250A-01 | Amplitude Flatness May Exceed One-Year Limits in First Year. | 2004.07.05 |
| 33250A | Modification Recommended | 33250A-02 | Flatness Calibration Error | 2009.08.06 |
| 33250A | Modification Recommended | 33250A-03B | Internal Clock Reference Calibration Error | 2010.09.21 |
| 33509B | Modification Recommended | 33509B-02 | Some customers have reported that, when line power is applied to the instrument but the instrument is NOT turned on (“Standby Mode”), some instruments will emit an audible high-pitched whistle or whine. To fix this, the existing power supply must be replaced with a newly designed power supply, as detailed in the solution below. | 2017.10.11 |
| 33509B | Modification Recommended | 33509B-03 | The dot key on front panel intermittently not active. | 2018.08.02 |
| 33509B | Modification Recommended | 33509B-04 | The trigger LED does not blink when burst mode is set to on. | 2018.10.02 |
| 33509B | Information Only | 33509B-05 | LAN connection failure when connected to external switch/hub. | 2023.07.26 |
| 33510B | Modification Recommended | 33510B-02 | Some customers have reported that, when line power is applied to the instrument but the instrument is NOT turned on (“Standby Mode”), some instruments will emit an audible high-pitched whistle or whine. To fix this, the existing power supply must be replaced with a newly designed power supply, as detailed in the solution below. | 2017.10.11 |
| 33510B | Modification Recommended | 33510B-03 | The dot key on front panel intermittently not active. | 2018.08.02 |
| 33510B | Modification Recommended | 33510B-04 | The trigger LED does not blink when burst mode is set to on. | 2018.10.02 |
| 33510B | Information Only | 33510B-05 | LAN connection failure when connected to external switch/hub. | 2023.07.26 |
| 33511B | Modification Recommended | 33511B-02 | Some customers have reported that, when line power is applied to the instrument but the instrument is NOT turned on (“Standby Mode”), some instruments will emit an audible high-pitched whistle or whine. To fix this, the existing power supply must be replaced with a newly designed power supply, as detailed in the solution below. | 2017.10.11 |
| 33511B | Modification Recommended | 33511B-03 | The dot key on front panel intermittently not active. | 2018.08.02 |
| 33511B | Modification Recommended | 33511B-04 | The trigger LED does not blink when burst mode is set to on | 2018.10.02 |
| 33511B | Information Only | 33511B-05 | LAN connection failure when connected to external switch/hub. | 2023.07.27 |
| 33512B | Modification Recommended | 33512B-02 | Some customers have reported that, when line power is applied to the instrument but the instrument is NOT turned on (“Standby Mode”), some instruments will emit an audible high-pitched whistle or whine. To fix this, the existing power supply must be replaced with a newly designed power supply, as detailed in the solution below. | 2017.10.11 |
| 33512B | Modification Recommended | 33512B-03 | The dot key on front panel intermittently not active | 2018.08.02 |
| 33512B | Modification Recommended | 33512B-04 | The trigger LED does not blink when burst mode is set to on. | 2018.10.02 |
| 33512B | Information Only | 33512B-06 | LAN connection failure when connected to external switch/hub. | 2023.07.26 |
| 33512B | Information Only | 33521B-05 | LAN connection failure when connected to external switch/hub. | 2023.07.26 |
| 33519B | Modification Recommended | 33519B-02 | Some customers have reported that, when line power is applied to the instrument but the instrument is NOT turned on (“Standby Mode”), some instruments will emit an audible high-pitched whistle or whine. To fix this, the existing power supply must be replaced with a newly designed power supply, as detailed in the solution below. | 2017.10.11 |
| 33519B | Modification Recommended | 33519B-03 | The dot key on front panel intermittently not active | 2018.08.02 |
| 33519B | Modification Recommended | 33519B-04 | The trigger LED does not blink when burst mode is set to on. | 2018.10.02 |
| 33519B | Information Only | 33519B-05 | LAN connection failure when connected to external switch/hub. | 2023.07.26 |
| 33520B | Modification Recommended | 33520B-02 | Some customers have reported that, when line power is applied to the instrument but the instrument is NOT turned on (“Standby Mode”), some instruments will emit an audible high-pitched whistle or whine. To fix this, the existing power supply must be replaced with a newly designed power supply, as detailed in the solution below. | 2017.10.11 |
| 33520B | Modification Recommended | 33520B-03 | The dot key on front panel intermittently not active | 2018.08.02 |
| 33520B | Modification Recommended | 33520B-04 | The trigger LED does not blink when burst mode is set to on. | 2018.10.02 |
| 33520B | Information Only | 33520B-05 | LAN connection failure when connected to external switch/hub. | 2023.07.26 |
| 33521AN | Modification Recommended | 33521AN-01 | Some customers have reported that, when line power is applied to the instrument but the instrument is NOT turned on (“Standby Mode”), some instruments will emit an audible high-pitched whistle or whine. To fix this, the existing power supply must be replaced with a newly designed power supply, as detailed in the solution below. | 2017.10.11 |
| 33521AN | Modification Recommended | 33521AN-02 | The dot key on front panel intermittently not active | 2018.08.02 |
| 33521AN | Modification Recommended | 33521AN-03 | The trigger LED does not blink when burst mode is set to on. | 2018.10.02 |
| 33521AN | Information Only | 33521AN-04 | LAN connection failure when connected to external switch/hub | 2023.08.15 |
| 33521B | Modification Recommended | 33521B-02 | Some customers have reported that, when line power is applied to the instrument but the instrument is NOT turned on (“Standby Mode”), some instruments will emit an audible high-pitched whistle or whine. To fix this, the existing power supply must be replaced with a newly designed power supply, as detailed in the solution below. | 2017.10.11 |
| 33521B | Modification Recommended | 33521B-03 | The dot key on front panel intermittently not active | 2018.08.02 |
| 33521B | Modification Recommended | 33521B-04 | The trigger LED does not blink when burst mode is set to on. | 2018.10.02 |
| 33522B | Modification Recommended | 33522B-02 | Some customers have reported that, when line power is applied to the instrument but the instrument is NOT turned on (“Standby Mode”), some instruments will emit an audible high-pitched whistle or whine. To fix this, the existing power supply must be replaced with a newly designed power supply, as detailed in the solution below. | 2017.10.11 |
| 33522B | Modification Recommended | 33522B-03 | The dot key on front panel intermittently not active | 2018.08.02 |
| 33522B | Modification Recommended | 33522B-04 | The trigger LED does not blink when burst mode is set to on. | 2018.10.02 |
| 33522B | Information Only | 33522B-06 | LAN connection failure when connected to external switch/hub. | 2023.07.26 |
| 33611A | Modification Recommended | 33611A-03 | Customers have reported that when power is applied to the instrument but the instrument NOT turned on (“Standby Mode”), some instruments will emit an audible high-pitched whistle or whine. To fix this, the existing power supply must be replaced with the newer power supply, as detailed in the solution below. | 2017.01.09 |
| 33611A | Modification Recommended | 33611A-05 | Incorrect non-volatile memory size on waveform generators built with FW revision A.02.00 until A.02.02. | 2023.06.20 |
| 33612A | Modification Recommended | 33612A-03 | Customers have reported that when power is applied to the instrument but the instrument NOT turned on (“Standby Mode”), some instruments will emit an audible high-pitched whistle or whine. To fix this, the existing power supply must be replaced with the newer power supply, as detailed in the solution below. | 2017.01.09 |
| 33612A | Modification Recommended | 33612A-06 | Incorrect non-volatile memory size on waveform generators built with FW revision A.02.00 until A.02.02. | 2023.06.20 |
| 33621A | Modification Recommended | 33621A-03 | Customers have reported that when power is applied to the instrument but the instrument NOT turned on (“Standby Mode”), some instruments will emit an audible high-pitched whistle or whine. To fix this, the existing power supply must be replaced with the newer power supply, as detailed in the solution below. | 2017.01.09 |
| 33621A | Modification Recommended | 33621A-05 | Incorrect non-volatile memory size on waveform generators built with FW revision A.02.00 until A.02.02. | 2023.06.20 |
| 33622A | Modification Recommended | 33622A-03 | Customers have reported that when power is applied to the instrument but the instrument NOT turned on (“Standby Mode”), some instruments will emit an audible high-pitched whistle or whine. To fix this, the existing power supply must be replaced with the newer power supply, as detailed in the solution below. | 2017.01.09 |
| 33622A | Modification Recommended | 33622A-06 | Incorrect non-volatile memory size on waveform generators built with FW revision A.02.00 until A.02.02. | 2023.06.20 |
| 34172B | Modification Recommended | 34172B-01 | Intermittent Ohm measurement failure when using shorting block. | 2018.08.06 |
| 34401A | Modification Recommended | 34401A-02 | Modification resizes input terminals to accept European plugs | 1993.03.31 |
| 34401A | Modification Recommended | 34401A-03 | Mod improves time stability of DC current ranges (10 mA/100 mA) | 1994.03.10 |
| 34401A | Modification Recommended | 34401A-05A | Excessive time drift of ohms function calibration | 1995.01.11 |
| 34401A | Information Only | 34401A-06 | Display assembly replacement requires compatible firmware. | 1996-01 |
| 34401A | Modification Recommended | 34401A-07 | Mod corrects RS-232 communication error | 1996.06.13 |
| 34401A | Modification Recommended | 34401A-08 | Communication on the GPIB stops or an error flag is set under some operating conditions | 1997.08.31 |
| 34401A | Modification Recommended | 34401A-09 | Mod to eliminate infrequent erroneous ""overload"" indication | 2001.01.07 |
| 34401A | Modification Recommended | 34401A-10A | RS232 Communication Error for the HP34401A | 1998.06.30 |
| 34401A | Modification Recommended | 34401A-11 | Failure to meet the 1M & 10M 4-Wire ohm 1yr specs | 1999.02.17 |
| 34401A | Modification Recommended | 34401A-12 | 10 megohm and 100 megohm ranges drift out of specification | 2003.10.08 |
| 34401A | Modification Recommended | 34401A-15B | 10 megohm and 100 megohm ranges drift out of specification | 2011.10.03 |
| 34401A | Modification Recommended | 34401A-16A | The instrument may not show the correct voltage, when measuring a voltage in the range of -67 to -124 volts DC. | 2011.08.08 |
| 34401A | Modification Recommended | 34401A-17B | Temperature drift out of accuracy specification on 3 Amp | 2012.04.02 |
| 34401A | Modification Recommended | 34401A-18 | AC Volts accuracy may drift out of specification before first calibration | 2014.06.01 |
| 34401A | Modification Recommended | 34401A-21 | Customer reported out of box failures of the 90 day 1000V DCV Gain Verification and 100V/1 kHz ACV Gain Verification points. Replacement unit provided to customer also exhibited the same failures. Investigation revealed instability of a test instrument used during factory calibration and verification. | 2017.10.08 |
| 34405A | Modification Available | 34405A-01 | Firmware upgrade to eliminate Error 631 or Error 635 when self-test is performed | 2007.03.01 |
| 34405A | Modification Available | 34405A-02 | Firmware upgrade to resolve turn on failure and performance improvement | 2007.09.10 |
| 34405A | Modification Available | 34405A-05 | Firmware upgrade to resolve intermittent turn on failure | 2012.05.01 |
| 34405A | Modification Recommended | 34405A-06 | Firmware to resolve Error 635 during power cycle | 2013.01.14 |
| 34405A | Modification Recommended | 34405A-07 | No display after power on the unit. | 2014.03.23 |
| 34405A | Information Only | 34405A-08 | 34405A Digital Multimeter will be replaced by 34450A Digital Multimeter | 2016.12.20 |
| 34410A | Modification Recommended | 34410A-01A-RECALL | RECALL-The 34410A has an ‘adjust always’ policy recommended by the supplying division. The calibration values determined in the adjustment routine were not stored in non-volatile memory. As a result, the unit reverted to the conditions indicated by the “As Received” conditions in the cal cert and the “As Received” measurement report. The conditions indicated in the “As Completed” conditions in the cal cert and the “As Completed” measurement report are not valid. | 2010.06.01 |
| 34410A | Modification Recommended | 34410A-02 | Several 34410A DMM units have a zero offset due to a defective shorting block used in the production calibration system. | 2014.07.13 |
| 34411A | Modification Recommended | 3441XA-01A | Procedure to latch display PCA if not properly installed. | 2006.09.12 |
| 34411A | Modification Recommended | 34411A-01A-RECALL | RECALL-The 34411A has an "adjust always" policy recommended by the supplying division. The calibration values determined in the adjustment routine were not stored in non-volatile memory. As a result, the unit reverted to the conditions indicated by the “As Received” conditions in the cal cert and the “As Received” measurement report. The conditions indicated in the “As Completed” conditions in the cal cert and the “As completed” measurement report are not valid. | 2010.06.02 |
| 34411A | Modification Recommended | 34411A-02 | Several 34411A DMM units did not get a good zero calibration in production due to a defective shorting block. | 2014.07.13 |
| 34420A | Modification Recommended | 34420A-01 | Mod corrects RS-232 communication error | 1996.06.13 |
| 34420A | Modification Recommended | 34420A-02A | RS232 Communication error for the 34420A | 1998.10.07 |
| 34420A | Modification Available | 34420A-03 | Infrequent HP-IB Hang-ups | 1999.02.17 |
| 34420A | Modification Recommended | 34420A-04 | Inaccurate temperature readings | 1999.02.17 |
| 34450A | Modification Recommended | 34450A-01A | Mechanical rattling noise due to detached shield plate. | 2014.05.05 |
| 34450A | Modification Available | 34450A-03 | Intermittent freeze occurring on screen resolve by firmware reinstallation. | 2013.07.04 |
| 34450A | Modification Recommended | 34450A-04 | 34450A unit missing calibration traceability | 2013.11.05 |
| 34450A | Safety | 34450A-05-S | 34450A 5 ½ Digit Multimeter with firmware version 00.60-00.66 and below displays incorrect reading when powered with 60Hz AC line under DCV Measurement in Slow measurement mode when measuring signals above 120V DC. | 2015.08.31 |
| 34450A | Modification Recommended | 34450A-06 | 34450A within the serial number range may not meet the10nF range capacitance, 100mV range DC Voltage and 100 MOhm range resistance measurements specification within the first year shipment. | 2015.11.17 |
| 34450A | Modification Recommended | 34450A-07 | 2-wire resistance measurement may be out of specification at 10MOhm range. | 2016.09.21 |
| 34460A | Modification Recommended | 34460A-02 | Various instruments may exhibit an accelerated DCV drift rate which exceeds product specifications. | 2014.09.14 |
| 34460A | Modification Recommended | 34460A-05 | Keysight 34460A/34461A/34465A/34470A Digital Multimeter with firmware version below “FW 2.17” may experience ACV out of specification. | 2018.04.16 |
| 34460A | Modification Recommended | 34460A-07A | Incorrect label printing on the DMM front panel. | 2021.02.08 |
| 34460A | Modification Recommended | 34460A-08 | Failure due to front panel loose issue | 2022.08.17 |
| 34461A | Modification Recommended | 34461A-02 | Various instruments may exhibit an accelerated DCV drift rate which exceeds product specifications. | 2014.09.14 |
| 34461A | Information Only | 34461A-04A | Specification change in the maximum allowable measured voltage for the Keysight 34460A/34461A/34465A/34470A Digital Multimeter. | 2017.04.28 |
| 34461A | Modification Recommended | 34461A-05 | Keysight 34460A/34461A/34465A/34470A Digital Multimeter with firmware version below “FW 2.17” may experience ACV out of specification. | 2018.04.16 |
| 34461A | Modification Recommended | 34461A-06 | Units may exhibit an accelerated DCV drift rate which exceeds the 90-days or 1-year product specification within 2 weeks of usage. | 2018.06.05 |
| 34461A | Modification Recommended | 34461A-08A | Incorrect label printing on the DMM front panel . | 2021.02.08 |
| 34461A | Modification Recommended | 34461A-09 | Failure due to front panel loose issue. | 2022.02.01 |
| 34465A | Modification Recommended | 34465A-02 | Keysight 34460A/34461A/34465A/34470A Digital Multimeter with firmware version below “FW 2.17” may experience ACV out of specification. | 2018.04.17 |
| 34465A | Modification Recommended | 34465A-05A | Incorrect label printing on the DMM front panel. | 2021.02.08 |
| 34465A | Modification Recommended | 34465A-06 | Failure due to front panel loose issue. | 2022.02.01 |
| 34470A | Modification Recommended | 34470A-02 | Keysight 34460A/34461A/34465A/34470A Digital Multimeter with firmware version below “FW 2.17” may experience ACV out of specification. | 2018.04.16 |
| 34470A | Modification Recommended | 34470A-05A | Incorrect label printing on the DMM front panel. | 2021.02.08 |
| 34470A | Modification Recommended | 34470A-06 | Failure due to front panel loose issue. | 2022.02.01 |
| 34703A | Modification Recommended | 34703A-7 | Serial Numbers: Prior to 1251A01651 – TEMPERATURE SENSITIVE OHMS OPERATION | 1975-04 |
| 34703A | Modification Recommended | 34703A-8 | Serial Numbers: Prior to 1251A01351 – FAILURE OF AUTO MODE TEST 8 | 1975-04 |
| 34703A | Modification Recommended | 34703A-9 | Serial Numbers: 1251AOl700 and below – IMPROPER OHMS OPERATION DUE TO BROKEN Al BOARD | 1975-05 |
| 34901A | Modification Recommended | 34901A-01A | Top cover of modules are out of tolerence causing the modules to not fit properly into the mainframe. | 2002.03.31 |
| 34901A | Modification Recommended | 34901A-02 | Internal reference junction temperature sensor improvement | 2000.11.06 |
| 34901A | Modification Recommended | 34901A-04B | 34901A temperature measurements out of specification | 2006.09.27 |
| 34901A | Modification Recommended | 34901A-05 | The relays used in these modules may have contaminated contacts that cause intermittent high resistance. | 2012.06.04 |
| 34901A | Modification Recommended | 34901A-07 | Hard or too tight to insert the module into 34970A/34972A | 2018.01.17 |
| 34902A | Modification Recommended | 34902A-01A | Modification corrects unwanted simultaneously relay closures | 1998.03.01 |
| 34902A | Modification Recommended | 34902A-02A | Top cover of modules are out of tolerance causing the modules to not fit properly into the mainframe. | 2002.04.10 |
| 34902A | Modification Recommended | 34902A-03 | New Code Eliminates Simultaneous Closure of All Channel Relays | 1999.02.17 |
| 34902A | Modification Recommended | 34902A-04 | Internal reference junction temperature sensor improvement | 2000.11.06 |
| 34902A | Modification Recommended | 34902A-06B | temperature measurements out of specification | 2006.09.27 |
| 34902A | Modification Recommended | 34902A-08 | Hard or too tight to insert the module into 34970A/3497 | 2018.01.17 |
| 34903A | Modification Recommended | 34903A-01A | Top covers of modules are out of tolerance causing the modules to not fit properly into the mainframe. | 2002.04.11 |
| 34903A | Modification Recommended | 34903A-02 | The relays used in these modules may have contaminated contacts that cause intermittent high resistance. | 2012.06.04 |
| 34904A | Modification Recommended | 34904A-01A | Top cover of modules are out of tolerance causing the modules to not fit properly into the mainframe. | 2002.04.17 |
| 34904A | Modification Recommended | 34904A-03 | The relays used in these modules may have contaminated contacts that cause intermittent high resistance. | 2012.06.04 |
| 34905A | Modification Recommended | 34905A-01A | Topcover of modules are out of tolerance causing the modules to not fit properly into the mainframe. | 2002.04.17 |
| 34907A | Modification Recommended | 34907A-01 | 34970A's modules do not fit into mainframes | 1998.11.10 |
| 34908A | Modification Recommended | 34908A-01 | 34970A's modules do not fit into mainframes | 1998.11.10 |
| 34908A | Modification Recommended | 34908A-02 | Internal reference junction temperature sensor improvement | 2000.11.06 |
| 34908A | Modification Recommended | 34908A-04B | temperature measurements out of specification | 2006.09.27 |
| 34908A | Modification Recommended | 34908A-05 | The relays used in these modules may have contaminated contacts that cause intermittent high resistance. | 2012.06.04 |
| 34908A | Modification Recommended | 34908A-07 | Hard or too tight to insert the module into 34970A/34972A | 2018.01.17 |
| 34921A | Modification Recommended | 34921A-01A | Relays may have contaminated contacts that can cause intermittent contact resistance in excess of 100 ohms. | 2013.06.06 |
| 34921A | Modification Recommended | 34921A-02 | Intermittent contact resistance with Analog Bus (ABus) relays. | 2013.06.06 |
| 34921A | Information Only | 34921A-04 | New Orbital Sanded Covers for 34980A modules | 2022.06.27 |
| 34922A | Modification Recommended | 34922A-01A | Relays may have contaminated contacts that can cause intermittent contact resistance in excess of 100 ohms. | 2013.06.06 |
| 34922A | Modification Recommended | 34922A-02 | Intermittent contact resistance with Analog Bus (ABus) relays. | 2013.06.06 |
| 34922A | Information Only | 34922A-04 | New Orbital Sanded Covers for 34980A modules | 2022.06.27 |
| 34922T | Modification Recommended | 34922T-01 | Unable to connect to mating connector | 2022.05.01 |
| 34923A | Modification Recommended | 34923A-01 | Intermittent contact resistance with Analog Bus (ABus) relays. | 2013.06.06 |
| 34923A | Information Only | 34923A-03 | New Orbital Sanded Covers for 34980A modules | 2022.06.27 |
| 34924A | Modification Recommended | 34924A-01 | Intermittent contact resistance with Analog Bus (ABus) relays. | 2013.06.06 |
| 34924A | Information Only | 34924A-03 | New Orbital Sanded Covers for 34980A modules | 2022.06.27 |
| 34924T | Modification Recommended | 34924T-01 | Unable to connect to mating connector | 2022.05.01 |
| 34925A | Modification Recommended | 34925A-01 | Intermittent contact resistance with Analog Bus (ABus) relays. | 2013.06.06 |
| 34925A | Information Only | 34925A-03 | New Orbital Sanded Covers for 34980A modules | 2022.06.27 |
| 34931A | Modification Recommended | 34931A-01A | Relays may have contaminated contacts that can cause intermittent contact resistance in excess of 100 ohms. | 2013.06.06 |
| 34931A | Modification Recommended | 34931A-02 | Intermittent contact resistance with Analog Bus (ABus) relays. | 2013.06.06 |
| 34931A | Information Only | 34931A-04 | New Orbital Sanded Covers for 34980A modules | 2022.06.27 |
| 34932A | Modification Recommended | 34932A-01A | Relays may have contaminated contacts that can cause intermittent contact resistance in excess of 100 ohms. | 2013.06.06 |
| 34932A | Modification Recommended | 34932A-02 | Intermittent contact resistance with Analog Bus (ABus) relays. | 2013.06.06 |
| 34932A | Information Only | 34932A-04 | New Orbital Sanded Covers for 34980A modules | 2022.06.27 |
| 34933A | Modification Recommended | 34933A-01 | Intermittent contact resistance with Analog Bus (ABus) relays. | 2013.06.06 |
| 34933A | Information Only | 34933A-02 | New Orbital Sanded Covers for 34980A modules | 2022.06.27 |
| 34934A | Information Only | 34934A-02 | New Orbital Sanded Covers for 34980A modules | 2022.06.27 |
| 34934C | Modification Recommended | 34934C-01 | Unable to connect to mating connector | 2022.05.01 |
| 34934T | Modification Recommended | 34934T-01 | Unable to connect to mating connector | 2022.05.01 |
| 34937A | Modification Recommended | 34937A-01 | Firmware Upgrade to correct defect | 2005.07.10 |
| 34937A | Modification Recommended | 34937A-02B | Relays may have contaminated contacts that can cause intermittent contact resistance in excess of 100 ohms. | 2014.06.01 |
| 34937A | Information Only | 34937A-04 | New Orbital Sanded Covers for 34980A modules | 2022.06.27 |
| 34938A | Modification Recommended | 34938A-01 | Firmware Upgrade to correct defect | 2005.07.10 |
| 34938A | Information Only | 34938A-02 | New Keysight Color | 2020.02.13 |
| 34938A | Information Only | 34938A-03 | New Orbital Sanded Covers for 34980A modules | 2022.06.27 |
| 34939A | Modification Recommended | 34939A-01A | Relays may have contaminated contacts that can cause intermittent contact resistance in excess of 100 ohms. | 2013.06.06 |
| 34939A | Information Only | 34939A-03 | New Orbital Sanded Covers for 34980A modules | 2022.06.27 |
| 34939T | Modification Recommended | 34939T-01 | Unable to connect to mating connector | 2022.05.01 |
| 34941A | Information Only | 34941A-02 | New Orbital Sanded Covers for 34980A modules | 2022.06.27 |
| 34942A | Information Only | 34942A-02 | New Orbital Sanded Covers for 34980A modules | 2022.06.27 |
| 34945A | Modification Recommended | 34945A-01 | Missing or corrupted FPGA code resulting in error message on | 2005.11.30 |
| 34945A | Information Only | 34945A-04 | New Orbital Sanded Covers for 34980A modules | 2022.06.27 |
| 34946A | Information Only | 34946A-02 | New Orbital Sanded Covers for 34980A modules | 2022.06.27 |
| 34947A | Information Only | 34947A-02 | New Orbital Sanded Covers for 34980A modules | 2022.06.27 |
| 34950A | Information Only | 34950A-02 | New Orbital Sanded Covers for 34980A modules | 2022.06.27 |
| 34951A | Modification Recommended | 34951A-02 | Relay contact contamination causes variation in performance. | 2013.06.06 |
| 34951A | Information Only | 34951A-04 | New Orbital Sanded Covers for 34980A modules | 2022.06.27 |
| 34952A | Modification Recommended | 34952A-01 | Configured digital input channels are unable to read values correctly from digital output channels | 2019.08.13 |
| 34952A | Information Only | 34952A-03 | New Orbital Sanded Covers for 34980A modules | 2022.06.27 |
| 34959A | Information Only | 34959A-01 | New Orbital Sanded Covers for 34980A modules | 2022.06.27 |
| 34959A | Modification Recommended | 34959A-02 | Failure on 34959A Digital I/O Function. | 2022.09.26 |
| 34970A | Modification Recommended | 34970A-01 | Numeric errors associated with the scaling function | 1998.03.01 |
| 34970A | Modification Recommended | 34970A-02B | 34970A Intermittently Fails to Power On | 2001.10.31 |
| 34970A | Modification Recommended | 34970A-03 | 34970A's real-time system clock changes by one hour | 1998.11.10 |
| 34970A | Modification Recommended | 34970A-07 | Incorrect temp measurements during read/write | 2001.02.07 |
| 34970A | Modification Recommended | 34970A-08A | Incorrect wiring in RS232 Cable (shipped with 34970A). | 2002.03.13 |
| 34970A | Safety | 34970A-09B-S | AC power connector can be damaged which creates a shock hazard. | 2013.06.04 |
| 34970A | Modification Recommended | 34970A-10 | 34970A Powered by 50 Hz Line Frequency Incorrectly Measures Resistance | 2003.06.01 |
| 34970A | Modification Recommended | 34970A-11 | Firmware Update: Ohms current source output during other functions | 2003.06.12 |
| 34970A | Modification Recommended | 34970A-13 | 10 MegOhm and 100 MegOhm ranges drift out of specification due to the Ohm's current source reference resistor. This resistor may change in value with time. | 2003.10.05 |
| 34970A | Modification Recommended | 34970A-14C | Intermittent errors in less than 1% of 34970A’s. | 2010.11.19 |
| 34970A | Modification Recommended | 34970A-15 | 10 MΩ and 100 MΩ Ranges Drift Out of Specification | 2011.05.31 |
| 34970A | Modification Recommended | 34970A-18 | AC Volts and AC Current accuracy may drift out of specification before first calibration | 2014.06.22 |
| 34972A | Modification Recommended | 34972A-01 | 10 MΩ and 100 MΩ Ranges Drift Out of Specification | 2011.05.31 |
| 34972A | Modification Recommended | 34972A-02 | AC Volts and AC Current accuracy may drift out of specification before first calibration | 2014.06.22 |
| 34972A | Modification Recommended | 34972A-06B | Device USB communication may experience data or connection loss | 2019.05.07 |
| 34972A | Modification Recommended | 34972A-08 | 1 V/ 100 kHz Frequency Gain Verification test point failed to meet the specification. | 2019.08.28 |
| 34980A | Modification Recommended | 34980A-01 | The GPIB connector may have been installed using an incorrect size threaded standoff nut. | 2005.06.06 |
| 34980A | Modification Recommended | 34980A-03 | Intermittently 34980A units would not recognize the DMM anymore showing DMM revision to be 0.00 | 2009.11.18 |
| 34980A | Modification Recommended | 34980A-05 | Instrument cannot operate in 400 Hz | 2015.07.01 |
| 34980A | Modification Recommended | 34980A-06 | Devices found to have duplicate MAC addresses can cause an IP conflict when connected on the same local network. | 2019.03.10 |
| 34980A | Information Only | 34980A-08 | Removal of screwdriver as a standard shipped accessory | 2022.11.02 |
| 35652A | Modification Recommended | 35652A-01 | Mod improves reliability of microdot connector | 1994.02.10 |
| 35652B | Modification Recommended | 35652B-01 | Mod improves reliability of microdot connector | 1994.02.10 |
| 35670A | Modification Recommended | 35670A-01 | Mod fixes sticking power supply switch | 1993.11.11 |
| 35670A | Modification Available | 35670A-03 | Firmware upgrade provides new features and fixes defects | 1994.11.03 |
| 35670A | Modification Recommended | 35670A-07 | Catalog of disk remains displayed after disk is ejected | 1999.04.05 |
| 37212B | Modification Available | 37212B-02C | Recommended firmware upgrade improves performance | 1992.03.31 |
| 37701A | Modification Available | 37701A-02 | Additional features can be retrofitted to older instruments | 1992.03.31 |
| 37701A | Modification Available | 37701A-03 | Pulse Shape measurement capability (Opt. 001) can be retrofitted | 1992.03.31 |
| 37701A | Modification Recommended | 37701A-04 | Mod corrects automatic gain control problem on A6 assembly | 1993.12.31 |
| 37701A | Modification Recommended | 37701A-05 | New improved battery holder makes NVM battery repl easy | 1993.12.31 |
| 37701A | Modification Recommended | 37701A-06 | New firmware fixes fatal error 421 when printing Datacom Graph | 1993.12.31 |
| 37701A | Modification Recommended | 37701A-07 | Incorrect TERM level measurement on A1 Measurement Assembly | 1994.08.04 |
| 37701B | Modification Recommended | 37701B-01 | New F/W corrects error in FULL-T1 mode & Fractional-T1 mode | 1994.08.04 |
| 37702A | Modification Recommended | 37702A-01 | Incorrect TERM level measurement on A1 Measurement Assembly | 1994.08.04 |
| 37702A | Modification Recommended | 37702A-02 | New F/W corrects error in FULL-T1 mode & Fractional-T1 mode | 1994.08.04 |
| 37704A | Modification Recommended | 37704A-02 | Power supply modification improves performance | 1995.05.11 |
| 37711A | Modification Available | 37711A-02 | Additional features can be retrofitted to older instruments | 1992.03.31 |
| 37711A | Modification Available | 37711A-03 | Pulse Shape measurement capability (Opt. 001) will be retrofitted | 1992.03.31 |
| 37711A | Modification Recommended | 37711A-04 | Mod corrects automatic gain control problem on A6 assembly | 1993.12.31 |
| 37711A | Modification Recommended | 37711A-05 | New improved battery holder makes NVM battery repl easy | 1993.12.31 |
| 37711A | Modification Recommended | 37711A-06 | New firmware fixes fatal error 421 when printing Datacom Graph | 1993.12.31 |
| 37711A | Modification Recommended | 37711A-07 | Incorrect TERM level measurement on A1 Measurement Assembly | 1994.08.04 |
| 37718A | Modification Recommended | 37718A-07 | Optical power warning label | 2002.06.25 |
| 37719A | Modification Recommended | 37719A-06 | Optical power warning label | 2002.06.25 |
| 37743A | Modification Recommended | 37743A-01A | Mod corrects incorrectly loaded capacitor on transmitter board | 1993.12.31 |
| 37907A | Modification Recommended | 37907A-01 | Compatability problem with PCI Bridge chip on original DASS card | 2000.01.17 |
| 37907A | Modification Recommended | 37907A-02 | Sometimes the Interface Modules do not reset properly | 2000.01.17 |
| 37907A | Modification Available | 37907A-03 | Voice decoding does not switch properly between A/u-Law on Handset | 2000.01.17 |
| 37907A | Modification Available | 37907A-04 | A Common Mode Oscillation exists on the Handset port | 2000.01.17 |
| 37907A | Modification Available | 37907A-05B | Upgrading 133M Win95 to 300M Win98 | 2001.08.22 |
| 37907A | Modification Available | 37907A-06 | Upgrading 133M Win95 to 300M Win98 | 2001.08.22 |
| 37907A | Modification Available | 37907A-07 | Upgrading SW to Chinese Win98 | 2001.08.22 |
| 37907A | Modification Available | 37907A-09 | Upgrading data acquisition bandwidth | 2001.08.22 |
| 37915A | Modification Available | 37915A-01B | Operational Defects at Level 2 of SS7 Protocol | 1999.02.17 |
| 37916A | Modification Available | 37916A-01A | Operational Defects at Level 2 of SS7 Protocol | 1999.02.17 |
| 37918A | Modification Available | 37918A-01A | Operational Defects at Level 2 of SS7 Protocol | 1999.02.17 |
| 41421B | Modification Recommended | 41421B-01 | 41421B voltage force mode may be noisy | 2000.11.07 |
| 41501A | Modification Recommended | 41501A-01 | New power supply prevents shut-down failures | 1994.10.10 |
| 41501A | Modification Recommended | 41501A-03A | Power Supl Replcmnt to Prevent Shutdown/Reboot Problem | 2000.01.17 |
| 41501B | Modification Recommended | 41501B-01 | Main power switch is stuck | 2000.10.25 |
| 41800A | Modification Recommended | 41800A-03 | Recommended replacement nose assembly for probe pin | 1994.11.03 |
| 42841A | Modification Recommended | 42841A-03 | Mod. to prevent incorrect shut down caused by thermal switch error | 1992.10.31 |
| 42841A | Modification Recommended | 42841A-04B | Mod prevents bias current source fuses from blowing | 1995.01.11 |
| 43521A | Priority Safety | 43521A-01-S | A broken AC inlet may Potentially result in a electric shock hazard. | 2000.08.31 |
| 44470A | Modification Recommended | 44470A-01A | Defective connectors shipped with 44470A, 44471A, 44473A, 44474A The 44470A, 44471A, 44473A, and 44474A contain a main relay card and a removable screw terminal block (see Figure 1). Some of the removable terminal blocks that were shipped between 1-Jan-2008 and 08-April-2008 have a defective connector that results in half of the pins being unconnected. | 2008.04.27 |
| 44471A | Modification Recommended | 44471A-01A | Defective connectors shipped with 44470A, 44471A, 44473A, 44474A The 44470A, 44471A, 44473A, and 44474A contain a main relay card and a removable screw terminal block (see Figure 1). Some of the removable terminal blocks that were shipped between 1-Jan-2008 and 08-April-2008 have a defective connector that results in half of the pins being unconnected. | 2008.04.27 |
| 44473A | Modification Recommended | 44473A-01A | Defective connectors shipped with 44470A, 44471A, 44473A, 44474A The 44470A, 44471A, 44473A, and 44474A contain a main relay card and a removable screw terminal block (see Figure 1). Some of the removable terminal blocks that were shipped between 1-Jan-2008 and 08-April-2008 have a defective connector that results in half of the pins being unconnected. | 2008.04.27 |
| 44474A | Modification Recommended | 44474A-01A | Defective connectors shipped with 44470A, 44471A, 44473A, 44474A The 44470A, 44471A, 44473A, and 44474A contain a main relay card and a removable screw terminal block (see Figure 1). Some of the removable terminal blocks that were shipped between 1-Jan-2008 and 08-April-2008 have a defective connector that results in half of the pins being unconnected. | 2008.04.27 |
| 44704A | Modification Recommended | 44704A-03 | Intermittent Extra Readings | 1997.06.30 |
| 53131A | Modification Recommended | 53131A-01 | Unit powers up in Standby mode. | 1996.07.31 |
| 53131A | Modification Available | 53131A-03 | GPIB hangs when power for instrument is turned on at the same time as PC. | 2003.11.06 |
| 53131A | Modification Recommended | 53131A-07A | When signals are applied to both channel 1 and channel 2, and Auto Trigger is used, the channel making the measurement may receive an incorrect trigger. | 2010.03.03 |
| 53132A | Modification Recommended | 53132A-01 | Unit powers up in Standby mode. | 1996.07.31 |
| 53132A | Modification Available | 53132A-03 | GPIB hangs when power for instrument is turned on at the same time as PC | 2003.11.06 |
| 53132A | Modification Recommended | 53132A-07A | When signals are applied to both channel 1 and channel 2, and Auto Trigger is used, the channel making the measurement may receive an incorrect trigger. | 2010.03.03 |
| 53181A | Modification Recommended | 53181A-01 | Unit powers up in Standby mode. | 1996.07.31 |
| 53181A | Modification Available | 53181A-02 | GPIB hangs when power for instrument is turned on at the same time as PC. | 2003.11.06 |
| 53181A | Information Only | 53181A-03B | Some up-grades options for the 53181A Counter can be added by customers (experienced technicians). Other up-grade options must be installed by technical specialists at Agilent Service Centers. | 2005.11.11 |
| 53220A | Modification Recommended | 53220A-01A | Upgrading Instruments with Firmware Revision 1.05 to 1.08 and Greater | 2011.10.04 |
| 53230A | Modification Recommended | 53230A-01A | Upgrading Instruments with Firmware Revision 1.05 to 1.08 and Greater | 2011.10.04 |
| 53310A | Safety | 53310A-04A-S | Chassis ground wire may detach and contact line voltage. | 2004.03.23 |
| 54501A | Safety | 54501A-06-S | Defective line filter assembly may cause shock | 1996.01.31 |
| 54502A | Safety | 54502A-07-S | Defective line filter assembly may cause shock | 1996.01.31 |
| 54503A | Safety | 54503A-06-S | Defective line filter assembly may cause shock | 1996.01.31 |
| 54504A | Safety | 54504A-03-S | Defective line filter assembly may cause shock | 1996.01.31 |
| 54510B | Safety | 54510B-03-S | Defective line filter assembly may cause shock | 1996.01.31 |
| 54512B | Safety | 54512B-03-S | Defective line filter assembly may cause shock | 1996.01.31 |
| 54520A | Safety | 54520A-02-S | Defective line filter assembly may cause shock | 1996.01.31 |
| 54520C | Safety | 54520C-02-S | Defective line filter assembly may cause shock | 1996.01.31 |
| 54522A | Safety | 54522A-02-S | Defective line filter assembly may cause shock | 1996.01.31 |
| 54522C | Safety | 54522C-02-S | Defective line filter assembly may cause shock | 1996.01.31 |
| 54540A | Safety | 54540A-02-S | Defective line filter assembly may cause shock | 1996.01.31 |
| 54540C | Safety | 54540C-02-S | Defective line filter assembly may cause shock | 1996.01.31 |
| 54542A | Safety | 54542A-02-S | Defective line filter assembly may cause shock | 1996.01.31 |
| 54542C | Safety | 54542C-02-S | Defective line filter assembly may cause shock | 1996.01.31 |
| 54600A | Safety | 54600A-07-S | Possible shock hazard if cabinet handle is removed. | 1992.08.24 |
| 54600A | Modification Available | 54600A-09 | Lubrication leaking from behind control knobs | 1993.03.31 |
| 54601A | Safety | 54601A-07-S | Possible shock hazard if cabinet handle is removed. | 1992.08.24 |
| 54621D | Modification Recommended | 54621D-02 | Can fail threshold accuracy test | 2001.12.03 |
| 54622A | Modification Available | 54622A-01 | Tilt adjustment instructions after hemisphere transshipping | 2001.07.16 |
| 54622D | Modification Available | 54622D-01 | Tilt adjustment instructions after hemisphere transshipping | 2001.07.16 |
| 54622D | Modification Recommended | 54622D-02 | Can fail threshold accuracy test | 2001.12.03 |
| 54622D | Modification Recommended | 54622D-04 | Modification recommended. Supersedes Recall Service Note. | 2002.04.24 |
| 54624A | Modification Available | 54624A-01 | Tilt adjustment instructions after hemisphere transshipping | 2001.07.16 |
| 54641A | Modification Recommended | 54641A-01 | The 54641A product should have the power supply replaced, if the cooling fan becomes non-operational. | 2002.05.08 |
| 54641A | Modification Recommended | 54641A-04 | Correcting environmentally caused trace tilt | 2004.11.21 |
| 54641D | Modification Recommended | 54641D-01 | The 54641D product should have the power supply replaced, if the cooling fan becomes non-operational. | 2002.05.08 |
| 54641D | Modification Recommended | 54641D-04 | Correcting environmentally caused trace tilt | 2004.11.21 |
| 54642A | Modification Recommended | 54642A-01 | The 54642A product should have the power supply replaced, if the cooling fan becomes non-operational. | 2002.05.08 |
| 54642A | Modification Recommended | 54642A-04 | Correcting environmentally caused trace tilt | 2004.11.21 |
| 54642D | Modification Recommended | 54642D-01 | The 54642D product should have the power supply replaced, if the cooling fan becomes non-operational. | 2002.05.08 |
| 54642D | Modification Recommended | 54642D-04 | Correcting environmentally caused trace tilt | 2004.11.21 |
| 54754A | Modification Available | 54754A-03 | Add ESD shutter protection to electrical inputs on module. | 2004.09.27 |
| 54754A | Modification Recommended | 54754A-04 | TDR Module fails Vertical CAL, | 2004.10.03 |
| 54810A | Modification Recommended | 54810A-07B | Correct intermittent lockups caused by the motherboard. | 2005.02.16 |
| 54815A | Modification Recommended | 54815A-07B | Correct intermittent lockups caused by the motherboard. | 2005.02.10 |
| 54820A | Modification Recommended | 54820A-07B | Correct intermittent lockups caused by the motherboard. | 2005.02.10 |
| 54825A | Information Only | 54825A-01B | Replacing Older A4 AMI PC Motherboard Requires Extra Parts | 2002.08.27 |
| 54825A | Modification Recommended | 54825A-02 | Improved Side-Handle Mounting Screw Recommended | 1998-07 |
| 54825A | Modification Recommended | 54825A-04 | Adding LAN to the Infiniium | 1998-08 |
| 54825A | Information Only | 54825A-05 | Model 54810A Infinium Oscilloscopes | 1998-09 |
| 54825A | Modification Recommended | 54825A-06 | Upgrade Infinium Oscilloscopes With 64 MB RAM For Improved Performance and Reliability | 1999-03 |
| 54825A | Modification Recommended | 54825A-07A | Correct Intermittent Lockups Caused By the Motherboard etc | 2000-07 |
| 54825A | Modification Recommended | 54825A-07B | Correct intermittent lockups caused by the motherboard. | 2005.02.10 |
| 54825A | Modification Available | 54825A-08 | Infiniium Oscilloscope Performance Upgrade E2633A obsoleted and replaced with upgrade kits | 2001-05 |
| 54825A | Information Only | 54825A-09 | 54825A Infiniium Oscilloscopes – 2Gsa/s, 4 Ch, 500MHZ | 2002.05.20 |
| 54830B | Modification Available | 54830B-08A | Screws on acquisition board may become loose during shipment. | 2009.03.24 |
| 54830D | Modification Available | 54830D-08A | Screws on acquisition board may become loose during shipment. | 2009.03.24 |
| 54831B | Modification Available | 54831B-08A | Screws on acquisition board may become loose during shipment. | 2009.03.24 |
| 54831D | Modification Available | 54831D-08A | Screws on acquisition board may become loose during shipment. | 2009.03.24 |
| 54832B | Modification Available | 54832B-08A | Screws on acquisition board may become loose during shipment. | 2009.03.24 |
| 54832D | Modification Available | 54832D-08A | Screws on acquisition board may become loose during shipment. | 2009.03.24 |
| 54833A | Modification Available | 54833A-08A | Screws on acquisition board may become loose during shipment. | 2009.03.24 |
| 54833D | Modification Available | 54833D-08A | Screws on acquisition board may become loose during shipment. | 2009.03.24 |
| 54835A | Modification Recommended | 54835A-07B | Correct intermittent lockups caused by the motherboard. | 2005.02.10 |
| 54845A | Information Only | 54845A-01A | Replacing Older A4 PC Motherboard Requires Extra Parts | 1999-01 |
| 54845A | Modification Recommended | 54845A-02 | Improved Side-Handle Mounting Screw Recommended | 1998-07 |
| 54845A | Modification Recommended | 54845A-03 | Install Spacers to Protect A/D Hybrids From Damage | 1998-05 |
| 54845A | Modification Recommended | 54845A-04 | Adding LAN to the Infiniium | 1998-08 |
| 54845A | Information Only | 54845A-05 | Active probe calibration not working correctly in code rev. A.02.02 | 1998-09 |
| 54845A | Modification Recommended | 54845A-06 | Upgrade Infinium Oscilloscopes With 64 MB RAM For Improved Performance and Reliability | 1999-03 |
| 54845A | Modification Recommended | 54845A-07A | Correct Intermittent Lockups Caused By the Motherboard etc | 2000-07 |
| 54845A | Modification Recommended | 54845A-07B | Correct intermittent lockups caused by the motherboard. | 2005.02.10 |
| 54845A | Modification Available | 54845A-08 | Infiniium Oscilloscope Performance Upgrade E2633A obsoleted and replaced with upgrade kits | 2001-05 |
| 54845A | Information Only | 54845A-09 | 54845A Infiniium Oscilloscope 1.5 GHz,4ch, 4-8 Gsa/s. Infiniium Units that are shipped with Acquisition board number 54845-66538 will have problems storing the calibration cal-factors with system firmware A.04.30. Units will pass User Self-calibration, but if the unit’s power is cycled the cal-factors will not be saved, and the unit will be un-calibrated. | 2002.04.25 |
| 54845A | Information Only | 54845A-10A | This Service note is providing instructions for an alternate repair strategy for 54845A Infiniium Scope, when the A13 54845-69527 Exchange board is not available. | 2002.07.30 |
| 54845A | Information Only | 54845A-11 | This Service note is providing performance verification instructions to Service Centers repairing Infiniium Oscilloscopes. | 2002.05.20 |
| 54845A | Information Only | 54845A-12A | This Service note is communicating a possible repair strategy for instruments failing Trigger Self-Calibration. | 2002.09.05 |
| 59301A | Information Only | 59301A-2 | HP-IB VERIFICATION PROGRAM USING THE 9825A | 1977-02 |
| 64145A | Modification Recommended | 64145A-01 | New ROM firmware fixes incorrect SEB instruction | 1992.02.29 |
| 66000A | Modification Recommended | 66000A-01 | Unit resets when in serial link mode | 1993.02.19 |
| 66000A | Modification Recommended | 66000A-02 | New resistor values for ac line input prevents failure 00052000 | 1993.01.06 |
| 66000A | Modification Recommended | 66000A-03 | A1-U1 may short due to overshoots in the bias supply | 1995.01.11 |
| 66000A | Modification Recommended | 66000A-04 | New F/W improves SRQ performance after a serial poll | 1995.02.16 |
| 66000A | Modification Recommended | 66000A-05 | Non-functioning trigger In/Out capability when using multiple 6610XA modules | 2007.03.21 |
| 66000A | Modification Recommended | 66000A-06A | The instrument will not communicate or will not complete self test | 2008.10.26 |
| 66000A | Modification Recommended | 66000A-07 | The AC INPUT SAFETY COVER has a strain relief used to secure the AC line cord that may become loose. | 2009.10.08 |
| 66101A | Modification Recommended | 66101A-01 | Modification prevents output connector cover assemblies from cracking | 1993.03.31 |
| 66101A | Modification Recommended | 66101A-02 | PS may OV when load is removed at high output voltages | 1995.02.16 |
| 66101A | Modification Recommended | 66101A-03 | Status reported before Delay | 1995.12.31 |
| 66101A | Modification Recommended | 66101A-04 | New F/W corrects OCP occurring before Output off | 1996.03.14 |
| 66101A | Modification Recommended | 66101A-05 | New F/W makes List Mode work from the keyboard | 1996.03.14 |
| 66101A | Modification Recommended | 66101A-06 | Turnoff voltage overshoot | 1998.03.01 |
| 66101A | Modification Recommended | 66101A-07A | Leaky A2 bias supply capactiors C401 & C405 | 2002.07.15 |
| 66101A | Modification Available | 66101A-08A | The instrument will not communicate or will not complete self test | 2008.10.26 |
| 66101A | Modification Recommended | 66101A-09A | The Instrumment will not communicate or will not complete self test | 2008.10.29 |
| 66102A | Modification Recommended | 66102A-01 | Modification prevents output connector cover assemblies from cracking | 1993.03.31 |
| 66102A | Modification Recommended | 66102A-02 | Status reported before Delay | 1995.12.31 |
| 66102A | Modification Recommended | 66102A-03 | OCP may occur during Output Off | 1995.12.31 |
| 66102A | Modification Recommended | 66102A-04 | List Mode does not work from keyboard | 1995.12.31 |
| 66102A | Modification Recommended | 66102A-05 | Turnoff voltage overshoot | 1998.03.01 |
| 66102A | Modification Recommended | 66102A-06A | Leaky A2 Bias Supply Capacitors C401 & C405 | 2002.07.16 |
| 66102A | Modification Available | 66102A-07A | The Instrumment will not communicate or will not complete self test | 2008.10.26 |
| 66102A | Modification Recommended | 66102A-08A | The Instrumment will not communicate or will not complete self test | 2008.10.29 |
| 66103A | Modification Recommended | 66103A-01 | Modification prevents output connector cover assemblies from cracking | 1993.03.31 |
| 66103A | Modification Recommended | 66103A-02 | Status reported before Delay | 1995.12.31 |
| 66103A | Modification Recommended | 66103A-03 | OCP may occur during Output Off | 1995.12.31 |
| 66103A | Modification Recommended | 66103A-04 | List Mode does not work from keyboard | 1995.12.31 |
| 66103A | Modification Recommended | 66103A-05 | Turnoff voltage overshoot | 1998.03.01 |
| 66103A | Modification Recommended | 66103A-06A | Leaky A2 Bias Supply Capacitors C401 & C405 | 2002.07.16 |
| 66103A | Modification Available | 66103A-07A | The Instrumment will not communicate or will not complete self test | 2008.10.26 |
| 66103A | Modification Recommended | 66103A-08A | The Instrumment will not communicate or will not complete self test | 2008.10.29 |
| 66104A | Modification Recommended | 66104A-01 | Modification prevents output connector cover assemblies from cracking | 1993.03.31 |
| 66104A | Modification Recommended | 66104A-02 | Modification prevents output oscillation in 2 to 3 kHz range | 1993.03.31 |
| 66104A | Modification Recommended | 66104A-03 | Status reported before Delay | 1995.12.31 |
| 66104A | Modification Recommended | 66104A-04 | OCP may occur during Output Off | 1995.12.31 |
| 66104A | Modification Recommended | 66104A-05 | List Mode does not work from keyboard | 1995.12.31 |
| 66104A | Modification Recommended | 66104A-06 | Turnoff voltage overshoot | 1998.03.01 |
| 66104A | Modification Recommended | 66104A-07A | Leaky A2 Bias Supply Capacitors C401 & C405 | 2002.07.16 |
| 66104A | Modification Available | 66104A-08A | The Instrumment will not communicate or will not complete self test | 2008.10.26 |
| 66104A | Modification Recommended | 66104A-09A | The Instrumment will not communicate or will not complete self test | 2008.10.29 |
| 66105A | Modification Recommended | 66105A-01 | Modification prevents output connector cover assemblies from cracking | 1993.03.31 |
| 66105A | Modification Recommended | 66105A-02 | Supply may oscillate below 15 volts | 1995.01.11 |
| 66105A | Modification Recommended | 66105A-03 | Status reported before Delay | 1995.12.31 |
| 66105A | Modification Recommended | 66105A-04 | OCP may occur during Output Off | 1995.12.31 |
| 66105A | Modification Recommended | 66105A-05 | List Mode does not work from keyboard | 1995.12.31 |
| 66105A | Modification Recommended | 66105A-06 | Turnoff voltage overshoot | 1998.03.01 |
| 66105A | Modification Recommended | 66105A-07A | Leaky A2 Bias Supply Capacitors C401 & C405 | 2002.07.16 |
| 66105A | Modification Available | 66105A-08A | The Instrumment will not communicate or will not complete self test | 2008.10.26 |
| 66105A | Modification Recommended | 66105A-09A | The Instrumment will not communicate or will not complete self test | 2008.10.29 |
| 66106A | Modification Recommended | 66106A-01 | Modification prevents output connector cover assemblies from cracking | 1993.03.31 |
| 66106A | Modification Recommended | 66106A-02 | Status reported before Delay | 1995.12.31 |
| 66106A | Modification Recommended | 66106A-03 | OCP may occur during Output Off | 1995.12.31 |
| 66106A | Modification Recommended | 66106A-04 | List Mode does not work from keyboard | 1995.12.31 |
| 66106A | Modification Recommended | 66106A-05 | Turnoff voltage overshoot | 1998.03.01 |
| 66106A | Modification Recommended | 66106A-06A | Leaky A2 Bias Supply Capacitors C401 & C405 | 2002.07.16 |
| 66106A | Modification Available | 66106A-07A | The Instrumment will not communicate or will not complete self test | 2008.10.27 |
| 66106A | Modification Recommended | 66106A-08A | The Instrumment will not communicate or will not complete self test | 2008.10.29 |
| 66309B | Modification Recommended | 66309B-03B | Unit Exchange Program | 2001.01.31 |
| 66309B | Modification Available | 66309B-05 | Reliability Inprovement, GPIB/RS232 Interface | 2003.08.03 |
| 66309B | Modification Recommended | 66309B-06 | Unit Exchange Program | 2004.03.17 |
| 66309B | Modification Recommended | 66309B-07 | On faster computers, when programming over GPIB, a random error will occur. | 2005.09.28 |
| 66309B | Modification Recommended | 66309B-08A | The unit can exhibit power-on self-test errors, auto reboot, blank display, no output, and communication errors. | 2015.12.15 |
| 66309B | Modification Recommended | 66309B-09 | Power-On Self test Errors, Auto reboot, Blank display. No output Communication errors. No communication when using the GPIB Interface. | 2012.06.17 |
| 66309B | Modification Recommended | 66309B-080-01B | Unit Exchange Program | 2001.01.31 |
| 66309B | Modification Recommended | 66309B-521-02B | Unit exchange program | 2001.05.22 |
| 66309B | Modification Available | 66309B-521-03 | Reliability Improvement, GPIB/RS232 Interface | 2003.08.04 |
| 66309B | Modification Recommended | 66309B-521-04 | Unit Exchange Program | 2004.03.16 |
| 66309D | Modification Recommended | 66309D-03B | Unit Exchange Program | 2001.01.31 |
| 66309D | Modification Recommended | 66309D-05 | Unit Exchange Program | 2004.03.17 |
| 66309D | Modification Recommended | 66309D-07A | The unit can exhibit power-on self-test errors, auto reboot, blank display, no output, and communication errors. | 2015.12.15 |
| 66309D | Modification Recommended | 66309D-080-01B | Unit Exchange Program | 2001.01.31 |
| 66309D | Modification Recommended | 66309D-521-02B | Unit Exchange Program | 2001.01.31 |
| 66309D | Modification Available | 66309D-521-03 | Reliability Improvement, GPIB/RS232 Interface | 2003.08.04 |
| 66309D | Modification Recommended | 66309D-521-04 | Unit Exchange Program | 2004.03.17 |
| 66311B | Modification Recommended | 66311B-03B | Unit Exchange Program | 2001.01.31 |
| 66311B | Modification Available | 66311B-05 | Reliability Improvement GPIB/RS232 Interface | 2003.08.04 |
| 66311B | Modification Recommended | 66311B-06 | Unit Exchange Program | 2004.03.17 |
| 66311B | Modification Recommended | 66311B-07 | On faster computers, when programming over GPIB, a random error will occur. | 2005.09.28 |
| 66311B | Modification Recommended | 66311B-08A | The unit can exhibit power-on self-test errors, auto reboot, blank display, no output, and communication errors. | 2015.12.15 |
| 66311B | Modification Recommended | 66311B-09 | Power-On Self test Errors, Auto reboot, Blank display. No output Communication errors. No communication when using the GPIB Interface. | 2012.06.17 |
| 66311B | Modification Recommended | 66311B-080-01B | Unit Exchange Program | 2001.01.31 |
| 66311B | Modification Recommended | 66311B-J02-03B | Unit Exchange Program | 2001.01.31 |
| 66311B | Modification Recommended | 66311B-J02-04 | Unit Exchange Program | 2004.03.17 |
| 66311D | Modification Recommended | 66311D-03B | Unit Exchange Program | 2001.01.31 |
| 66311D | Modification Recommended | 66311D-06 | Unit Exchange Program | 2004.03.17 |
| 66311D | Modification Recommended | 66311D-07 | On faster computers, when programming over GPIB, a random error will occur. | 2005.09.28 |
| 66311D | Modification Recommended | 66311D-080-01B | Unit exchange program | 2001.05.22 |
| 66312A | Modification Recommended | 66312A-06B | Unit Exchange Program | 2001.01.31 |
| 66312A | Safety | 66312A-07 | POSSIBLE “SHOCK” HAZARD | 2002.02.18 |
| 66312A | Modification Recommended | 66312A-10 | On faster computers, when programming over GPIB, a random error will occur. | 2005.09.28 |
| 66312A | Modification Recommended | 66312A-080-01A | Unit exchange program | 2001.05.22 |
| 66312A | Modification Recommended | 66312A-080-01B | Unit Exchange Program | 2001.01.31 |
| 66312A | Modification Recommended | 66312A-J01-01 | MODIFICATION TO IMPROVE PERFORMANCE | 2001.10.31 |
| 66312A | Modification Recommended | 66312A-J02-01 | MODIFICATION TO IMPROVE PERFORMANCE | 2001.10.31 |
| 66312A | Modification Recommended | 66312A-J02-02 | MODIFICATION TO IMPROVE PERFORMANCE | 2001.10.31 |
| 66312A | Modification Recommended | 66312A-J03-01 | MODIFICATION TO IMPROVE PERFORMANCE | 2001.10.31 |
| 66312A | Modification Recommended | 66312A-J04-01 | MODIFICATION TO IMPROVE PERFORMANCE | 2001.10.31 |
| 66312A | Modification Recommended | 66312A-J04-02 | MODIFICATION TO IMPROVE PERFORMANCE | 2001.10.31 |
| 66312A | Modification Recommended | 66312A-J04-03B | Unit Exchange Program | 2001.01.31 |
| 66312A | Modification Recommended | 66312A-J05-01 | MODIFICATION TO IMPROVE PERFORMANCE | 2001.10.31 |
| 66312A | Modification Recommended | 66312A-J05-02 | MODIFICATION TO IMPROVE PERFORMANCE | 2001.10.31 |
| 66312A | Modification Recommended | 66312A-J08-01 | MODIFICATION TO IMPROVE PERFORMANCE | 2001.10.31 |
| 66312A | Modification Recommended | 66312A-J08-03B | Unit exchange program | 2001.05.22 |
| 66319B | Modification Recommended | 66319B-01B | Unit Exchange Program | 2001.01.31 |
| 66319B | Modification Recommended | 66319B-02 | Fetch: Current? Error 603 | 2001.05.29 |
| 66319B | Modification Available | 66319B-05 | Reliability Improvement, GPIB/RS232 Interface | 2003.08.04 |
| 66319B | Modification Recommended | 66319B-06 | Unit Exchange Program | 2004.03.18 |
| 66319B | Modification Recommended | 66319B-07 | On faster computers, when programming over GPIB, a random error will occur. | 2005.09.28 |
| 66319B | Modification Recommended | 66319B-08A | The unit can exhibit power-on self-test errors, auto reboot, blank display, no output, and communication errors. | 2015.12.15 |
| 66319B | Modification Recommended | 66319B-09 | Power-On Self test Errors, Auto reboot, Blank display. No output Communication errors. No communication when using the GPIB Interface. | 2012.06.17 |
| 66319B | Modification Recommended | 66319B-10 | The current versions of test software for the 66319B, 66319D, 66321B & 66321D do not contain a test of the Current Sink as specified in the Performance, Calibration, and Configuration section” of the User’s Guide | 2012.09.12 |
| 66319B | Modification Available | 66319B-521-01 | Reliability Improvement, GPIB/RS232 Interface | 2003.08.04 |
| 66319B | Modification Recommended | 66319B-521-02 | Unit Exchange Program | 2004.03.18 |
| 66319D | Modification Recommended | 66319D-01B | Unit Exchange Program | 2001.01.31 |
| 66319D | Modification Recommended | 66319D-02 | Fetch: Current? Error 604 | 2001.05.29 |
| 66319D | Modification Available | 66319D-05 | Reliability Improvement. GPIB/RS232 Interface | 2003.08.04 |
| 66319D | Modification Recommended | 66319D-06 | Unit Exchange Program | 2004.03.18 |
| 66319D | Modification Recommended | 66319D-07 | On faster computers, when programming over GPIB, a random error will occur. | 2005.09.28 |
| 66319D | Modification Recommended | 66319D-08A | The unit can exhibit power-on self-test errors, auto reboot, blank display, no output, and communication errors. | 2015.12.15 |
| 66319D | Modification Recommended | 66319D-09 | Power-On Self test Errors, Auto reboot, Blank display. No output Communication errors. No communication when using the GPIB Interface. | 2012.06.17 |
| 66319D | Modification Recommended | 66319D-10 | The current versions of test software for the 66319B, 66319D, 66321B & 66321D do not contain a test of the Current Sink as specified in the Performance, Calibration, and Configuration section” of the User’s Guide | 2012.09.12 |
| 66319D | Modification Available | 66319D-521-01 | Reliability Improvement, GPIB/RS232 Interface | 2003.08.04 |
| 66319D | Modification Recommended | 66319D-521-02 | Unit Exchange Program | 2004.03.18 |
| 66321B | Modification Recommended | 66321B-01B | Unit Exchange Program | 2001.01.31 |
| 66321B | Modification Recommended | 66321B-02 | Fetch: Current? Error 605 | 2001.05.29 |
| 66321B | Modification Available | 66321B-05 | Reliability Improvement, GPIB/RS232 Interface | 2003.08.04 |
| 66321B | Modification Recommended | 66321B-06 | Unit Exchange Program | 2004.03.18 |
| 66321B | Modification Recommended | 66321B-07 | On faster computers, when programming over GPIB, a random error will occur. | 2005.09.28 |
| 66321B | Modification Recommended | 66321B-08 | The unit can exhibit power-on self-test errors, auto reboot, blank display, no output, and communication errors. | 2015.12.15 |
| 66321B | Modification Recommended | 66321B-09 | Power-On Self test Errors, Auto reboot, Blank display. No output Communication errors. No communication when using the GPIB Interface. | 2012.06.17 |
| 66321B | Modification Recommended | 66321B-10 | The current versions of test software for the 66319B, 66319D, 66321B & 66321D do not contain a test of the Current Sink as specified in the Performance, Calibration, and Configuration section” of the User’s Guide | 2012.09.12 |
| 66321B | Modification Available | 66321B-521-01 | Reliability Improvement, GPIB/RS232 Interface | 2003.08.04 |
| 66321D | Modification Recommended | 66321D-01B | Unit Exchange Program | 2001.01.31 |
| 66321D | Modification Recommended | 66321D-02 | Fetch: Current? Error 606 | 2001.05.29 |
| 66321D | Modification Available | 66321D-05 | Reliability Improvement, GPIB/RS232 Interface | 2003.08.04 |
| 66321D | Modification Recommended | 66321D-06 | Unit Exchange Program | 2004.03.18 |
| 66321D | Modification Recommended | 66321D-07 | On faster computers, when programming over GPIB, a random error will occur. | 2005.09.28 |
| 66321D | Modification Recommended | 66321D-08A | The unit can exhibit power-on self-test errors, auto reboot, blank display, no output, and communication errors. | 2015.12.15 |
| 66321D | Modification Recommended | 66321D-09 | Power-On Self test Errors, Auto reboot, Blank display. No output Communication errors. No communication when using the GPIB Interface. | 2012.06.17 |
| 66321D | Modification Recommended | 66321D-10 | The current versions of test software for the 66319B, 66319D, 66321B & 66321D do not contain a test of the Current Sink as specified in the Performance, Calibration, and Configuration section” of the User’s Guide | 2012.09.12 |
| 66321D | Modification Available | 66321D-521-01 | Reliability Improvement, GPIB/RS232 Interface | 2003.08.04 |
| 66332A | Modification Recommended | 66332A-01 | Low range current readback out of specifications | 1998.03.01 |
| 66332A | Modification Recommended | 66332A-02A | RS232/HP-IB Firmware Hang-ups | 1999.08.09 |
| 66332A | Modification Recommended | 66332A-03A | Blank Front Panel Display,Unit Dead | 1999.08.09 |
| 66332A | Modification Recommended | 66332A-06B | Unit Exchange Program | 2001.01.31 |
| 66332A | Modification Recommended | 66332A-09 | On faster computers, when programming over GPIB, a random error will occur. | 2005.09.29 |
| 66332A | Modification Recommended | 66332A-10 | There is a possible glitch on the output due to an AC Line sag between 23 VAC to 27 VAC. | 2011.01.10 |
| 66332A | Modification Recommended | 66332A-020-01B | Unit exchange program | 2001.05.22 |
| 66332A | Modification Recommended | 66332A-760-01B | Unit exchange program | 2001.05.22 |
| 70001A | Safety | 70001A-20-S | Possible fire hazard- faulty capacitors | 1995.09.30 |
| 70004A | Information Only | 70004A-03A | Replacement of keypad keys or retainer spring | 1991.12.03 |
| 70004A | Information Only | 70004A-07A | Troubleshooting Guide for disk/memory card addressing | 1992.03.18 |
| 70004A | Safety | 70004A-08-S | Right Side Strap Handle does Not Meet Safety Standards | 1992.06.24 |
| 70004A | Information Only | 70004A-13 | Reset Programmable Array Logic (PAL) integrated circuit | 1994.01.19 |
| 70004A | Information Only | 70004A-14 | Modification to prevent Modular System Interface Bus (MSIB) Lockup | 1995-07 |
| 70004A | Safety | 70004A-15-S | Possible fire hazard- faulty capacitors | 1995.09.30 |
| 70100A | Modification Recommended | 70100A-01 | Mod to eliminate loose reference oscillator N-type connectors | 1997.02.10 |
| 70100A | Modification Recommended | 70100A-03 | Modification to eliminate loose battery connections | 2001.01.07 |
| 70310A | Modification Recommended | 70310A-05 | Modification reduces 6 MHz emissions by approximately 6 dB | 1993.12.31 |
| 70611A | Information Only | 70611A-01 | Controller board fuse replacement | 1992.07.15 |
| 70611A | Modification Recommended | 70611A-02 | Rear panel auxiliary indicator wired incorrectly | 1998.10.13 |
| 70620B | Modification Recommended | 70620B-01 | Modification eliminates residual responses caused by noisy power supply | 1993.02.28 |
| 70700A | Information Only | 70700A-01C | Information on new firmware | 1994.01.04 |
| 70703A | Modification Recommended | 70703A-01 | The field replacement mechanical attenuator fail rate is higher than normal for instruments repaired between March 2003 and March 2006 | 2006.04.25 |
| 70908A | Modification Recommended | 70908A-21 | Module Verification Software Modification | 1992.12.08 |
| 70908A | Modification Recommended | 70908A-25 | Multiplier Power Out Adjustment | 1995.12.31 |
| 81002FF | Safety | 81002FF-01-S | Potential temperature related safety issue | 2001.12.10 |
| 81101A | Modification Available | 81101A-02C | New firmware 01.12.01/BIOS 1.30 package available | 2005.02.16 |
| 81101A | Modification Available | 81101A-04C | New firmware 01.12.01/BIOS 1.30 package available | 2005.02.16 |
| 81101A | Modification Recommended | 81101A-06B | Intermittent Display Failures | 2005.05.08 |
| 81104A | Modification Available | 81104A-01C | New firmware 01.12.01/BIOS 1.30 package available | 2005.02.16 |
| 81104A | Modification Available | 81104A-03C | New firmware 01.12.01/BIOS 1.30 package available | 2005.02.16 |
| 81104A | Modification Recommended | 81104A-05B | Intermittent Display Failures | 2005.05.08 |
| 81105A | Modification Recommended | 81105A-01A | Distorted output signal when large duty cycle used | 1999.11.28 |
| 81110A | Modification Available | 81110A-01C | New firmware 01.12.01/BIOS 1.30 package available | 2005.02.16 |
| 81110A | Modification Available | 81110A-03C | New firmware 01.12.01 /BIOS 1.30 package available | 2005.02.16 |
| 81110A | Modification Recommended | 81110A-05B | Intermittient Display Failures | 2005.05.08 |
| 81111A | Modification Recommended | 81111A-01A | Distorted output signal when large duty cycle used | 1999.11.28 |
| 81130A | Modification Available | 81130A-01B | Keypad locks during manual operation | 2003.02.11 |
| 81130A | Modification Recommended | 81130A-03B | Intermittient Display Failures | 2005.05.08 |
| 81133A | Modification Recommended | 81133A-01A | Control Knob does not work properly. Display starts flickering | 2011.02.09 |
| 81133A | Modification Available | 81133A-02 | 81133/34A Firmware Version 2.95 Update available | 2011.12.14 |
| 81134A | Modification Recommended | 81134A-01A | Control Knob does not work properly. Display starts flickering | 2011.02.09 |
| 81134A | Modification Available | 81134A-02 | 81133/34A Firmware Version 2.95 Update available | 2011.12.14 |
| 81141A | Priority Safety | 81141A-01-S | Possible Fire Hazard | 2007.08.08 |
| 81141A | Safety | 81141A-01A-S | POSSIBLE FIRE HAZARD. There is an unlikely possibility of an instrument catching fire due to a shortcircuit | 2012.12.11 |
| 81142A | Safety | 81142A-01A-S | POSSIBLE FIRE HAZARD. There is an unlikely possibility of an instrument catching fire due to a shortcircuit | 2012.12.11 |
| 81150A | Modification Recommended | 81150A-01 | Starting in August 2007 wrong SMT fuses were loaded on PCA of the E8305A. | 2008.09.16 |
| 81150A | Modification Recommended | 81150A-08A | Some shipped units have wrong entries in the internal Calibration Table (Calibration data) for three parameters, and could therefore fail Calibration (Performance Verification) in the service center. Please send back to the factory the affected units for recalibration! Do not repair these units! | 2010.12.09 |
| 81150A | Modification Recommended | 81150A-11 | Potential issue with duplicate MAC address | 2022.10.31 |
| 81160A | Modification Recommended | 81160A-02 | Potential issue with duplicate MAC address | 2022.10.31 |
| 81250A | Safety | 81250A-01-S | The power adapters need to be replaced by safety compliant extension cords and country specific power cords | 2007.02.07 |
| 81250A | Safety | 81250A-02-S | Dell informed Agilent that certain Dell Notebook batteries supplied with ParBERT systems might overheat and potentially catch fire. | 2009.03.15 |
| 81618A | Modification Recommended | 81618A-01 | Current peaks at turn-on might cause the coil to melt. TEC setting failure. | 2002.09.02 |
| 81619A | Modification Recommended | 81619A-01 | Current peaks at turn-on might cause the coil to melt. TEC settings failure | 2002.09.02 |
| 81640A | Modification Available | 8164A-05 | 81640A/81680A Power Repeatability in Fast Sweep Mode | 2000.06.30 |
| 81662A | Modification Recommended | 81662A-01 | Specification were enhanced for DFB lasers, old DFBs need firmware revision >3.0 to keep enhanced specification. | 2002.02.25 |
| 81663A | Modification Recommended | 81663A-01 | Specification were enhanced for DFB lasers, old DFBs need firmware revision >3.0 to keep enhanced specification. | 2002.02.25 |
| 81940A | Modification Available | 81940A-01 | Firmware update to fix possible wavelength offset. | 2004.11.16 |
| 81949A | Modification Available | 81949A-01 | Firmware update to fix possible wavelength offset. | 2004.11.22 |
| 81980A | Modification Available | 81980A-01 | Firmware update to fix possible wavelength offset. | 2004.11.22 |
| 81989A | Modification Available | 81989A-01 | Firmware update to fix possible wavelength offset | 2004.11.22 |
| 83220A | Priority Safety | 83220A-03-S | Incorrect value of line fuse fitted, combined with the failure of acomponent in the power supply secondary rectifier circuits, maycreate a fire hazard. | 1999.04.30 |
| 83220A | Safety | 83220A-04-S | Possible Shock Hazard, return to Agilent for Electrical safety (hi-pot) test, earth continuity test, and dielectric voltage (flash test) | 2000.01.31 |
| 83220E | Safety | 83220E-04-S | component in the power supply secondary rectifier circuits, may | 2000.01.31 |
| 83220E | Priority Safety | 83220E-03-S | Incorrect value of line fuse fitted, combined with the failure of acomponent in the power supply secondary rectifier circuits, maycreate a fire hazard. | 1999.04.30 |
| 83491A | Modification Recommended | 83491A-01 | “Module not recognized” error message | 2022.02.05 |
| 83620A | Modification Recommended | 83620A-02 | Modification to A38 modulators to prevent oscillation | 1997.02.10 |
| 83620B | Modification Recommended | 83620B-M71 | Tightening torque on p/n 08673-60040 APC 3.5mm(m)to(f) connector | 1999.01.31 |
| 83621B | Modification Recommended | 83621B-M71 | Tightening torque on p/n 08673-60040 APC 3.5mm(m)to(f) connector | 1999.01.31 |
| 83622B | Modification Recommended | 83622B-M71 | Tightening torque on p/n 08673-60040 APC 3.5mm(m)to(f) connector | 1999.01.31 |
| 83623B | Modification Recommended | 83623B-M71 | Tightening torque on p/n 08673-60040 APC 3.5mm(m)to(f) connector | 1999.01.31 |
| 83623L | Modification Recommended | 83623L-M71 | Tightening torque on p/n 08673-60040 APC 3.5mm(m)to(f) connector | 1999.01.31 |
| 83624B | Modification Recommended | 83624B-M71 | Tightening torque on p/n 08673-60040 APC 3.5mm(m)to(f) connector | 1999.01.31 |
| 83630B | Modification Recommended | 83630B-M71 | Tightening torque on p/n 08673-60040 APC 3.5mm(m)to(f) connector | 1999.01.31 |
| 83630L | Modification Recommended | 83630L-M71 | Tightening torque on p/n 08673-60040 APC 3.5mm(m)to(f) connector | 1999.01.31 |
| 83631B | Modification Recommended | 83631B-M71 | Tightening torque on p/n 08673-60040 APC 3.5mm(m)to(f) connector | 1999.01.31 |
| 83731B | Modification Recommended | 83731B-M71 | Tightening torque on p/n 08673-60040 APC 3.5mm(m)to(f) connector | 1999.01.31 |
| 83732B | Modification Recommended | 83732B-M71 | Tightening torque on p/n 08673-60040 APC 3.5mm(m)to(f) connector | 1999.01.31 |
| 83751A | Modification Recommended | 83751A-M71 | Tightening torque on p/n 08673-60040 APC 3.5mm(m)to(f) connector | 1999.01.31 |
| 83751B | Modification Recommended | 83751B-M71 | Tightening torque on p/n 08673-60040 APC 3.5mm(m)to(f) connector | 1999.01.31 |
| 83752A | Modification Recommended | 83752A-01 | Inspection and replmnt of rubber air dam attached to fan | 1996.03.14 |
| 83752A | Modification Recommended | 83752A-M71 | Tightening torque on p/n 08673-60040 APC 3.5mm(m)to(f) connector | 1999.01.31 |
| 83752B | Modification Recommended | 83752B-M71 | Tightening torque on p/n 08673-60040 APC 3.5mm(m)to(f) connector | 1999.01.31 |
| 85025D | Modification Available | 85025D-01 | Connector Repair Kits for the Agilent 85025D and 85025E Detectors (Agilent Kit Part Numbers 85025-60026 and 85025-60027) | 2013-12 |
| 85025E | Modification Available | 85025E-01 | Connector Repair Kits for the Agilent 85025D and 85025E Detectors (Agilent Kit Part Numbers 85025-60026 and 85025-60027) | 2013-12 |
| 85102B | Modification Available | 85102B-01 | New J1 Molex connector on the old A26 Rectifier Board | 1999.08.25 |
| 85106C | Modification Recommended | 85106C-01 | Modification increases RF source voltage to improve performance | 1992.03.31 |
| 85110A | Modification Recommended | 85110A-01 | D.C. Return Upgrade Kit | 1995.09.30 |
| 85110A | Safety | 85110A-02A-S | Rear panel fan cutout and fan guard allow accessibility of fan blades to an IEC 61010 type test finger. | 2007.05.09 |
| 85110L | Modification Recommended | 85110L-01 | D.C. Return Upgrade Kit | 1995.09.30 |
| 85110L | Safety | 85110L-02A-S | Rear panel fan cutout and fan guard allow accessibility of fan blades to an IEC 61010 type test finger. | 2007.05.09 |
| 85301B | Modification Recommended | 85301B-02 | Performance Software | 1999.10.31 |
| 85301C | Modification Recommended | 85301C-02 | Performance Software | 1999.10.31 |
| 85629B | Modification Recommended | 85629B-08 | Modified YTO adjustment | 1992.05.31 |
| 85650A | Modification Recommended | 85650A-1 | PREVENTING SPECTRUM ANALYZER ATTENUATOR DAMAGE WHEN PERFORMING CONDUCTED EMI MEASUREMENTS | 1981-08 |
| 85942A | Safety | 85942A-01-S | Possible safety hazard | 1995.12.31 |
| 85942A | Priority Safety | 85942A-02-S | Lack of instrument earth/ground, combined with possible detachmentof internal line module wires due to manufacturing defect, | 1996.05.31 |
| 85960B | Modification Recommended | 85960B-1201 | Noise at low end of Sweep | 2002.01.10 |
| 85961B | Modification Recommended | 85961B-1201 | Noise at low end of Sweep | 2002.01.10 |
| 85962A | Modification Recommended | 85962A-1201 | Noise at low end of Sweep | 2002.01.10 |
| 85963A | Modification Recommended | 85963A-1201 | Noise at low end of Sweep | 2002.01.10 |
| 86030A | Modification Recommended | 86030A-01 | Software upgrade adds remote programming capability to system | 2001.11.28 |
| 86030A | Modification Available | 86030A-02 | Cleaning the controller fan filter will increase system reliability | 2002.05.29 |
| 86030A | Modification Available | 86030A-03 | Characterize a customer's verification device, (83440D), following Lightwave Test Set, (86032A), factory repair or calibration | 2002.06.23 |
| 86100C | Modification Recommended | 86100C-02 | New part number for stainless steel anchor on DCA mainframe. | 2004.12.30 |
| 86100C | Modification Available | 86100C-04 | Add diode limiter to prevent counter assembly failures | 2006.08.29 |
| 86100C | Modification Recommended | 86100C-10B | Low Voltage part loaded in 5 V application causes performance to degrade over time. Inspect for low voltage part and replace. | 2010.01.26 |
| 86100C | Modification Recommended | 86100C-12A | Motherboard board mounting modification improves product reliability related to boot up issues. | 2010.04.15 |
| 86100D | Information Only | 86100D-08 | Choose correct 86100D SSD (Solid State Drive) based on installed CPU and Windows OS eligibility. | 2015.10.23 |
| 86100D | Modification Recommended | 86100D-09A | DCA-X Mainframe power supply may be prone to early failure under certain conditions. | 2017.01.04 |
| 86100D | Modification Available | 86100D-11A | An upgrade to Windows 10 is available for all 86100D DCA-X mainframes. Units with older CPU version will also require a CPU upgrade. See text below for determining CPU version. | 2020.08.30 |
| 86100D | Modification Available | 86100D-11B | An upgrade to Windows 10 is available for all 86100D DCA-X mainframes. Units with older CPU version will also require a CPU upgrade. See text for determining CPU version. | 2023.06.01 |
| 86105C | Modification Available | 86105C-03 | The 86105C has the ability to store Extinction Ratio Correction Factors (ERCF) to enhance the accuracy of extinction ratio measurements. Agilent Service centers now have the ability to calculate and store custom ERCF values for individual 86105C modules to enhance the accuracy and repeatability of ER measurements. | 2009.07.27 |
| 86106B | Modification Recommended | 86106B-01 | Memory Error in module | 2004.01.28 |
| 86107A | Modification Recommended | 86107A-01 | Memory Error in module | 2004.01.28 |
| 86108B | Modification Recommended | 86108B-01 | Install option JSA on all 86108B modules during regular service. | 2019.07.22 |
| 86144B | Modification Recommended | 86144B-01 | Potential servo board failure on 86144B | 2003.03.24 |
| 86146B | Modification Recommended | 86146B-01 | Potential servo board failures on 86146B | 2003.03.24 |
| 86290A | Information Only | 86290A-5 | FREQUENCY TRACKING ADJUSTMENT | 1982-01 |
| 86290B | Information Only | 86290B-3 | FREQUENCY TRACKING ADJUSTMENT | 1982-01 |
| 86290C | Information Only | 86290C-2 | FREQUENCY TRACKING ADJUSTMENT | 1982-01 |
| 86790B | Modification Recommended | 86790B-01 | Modification eliminates ground bounce and clock line reflections | 1992.09.30 |
| 86790B | Modification Recommended | 86790B-02 | Firmware history and upgrade procedures | 1993.03.31 |
| 87421A | Safety | 87421A-01-S | A potential shock hazard is present if the rivets fastening the AC power input module cause the plastic case to fracture. | 1992.02.20 |
