Table of Contents

HP 8643A

First Catalog 1992
Last Catalog 2001?
Frequency Range 0.252 - 1030/2060 MHz
Amplitude Range -137dBm to +13dBm

See Manuals section below

The 8643A signal generator is closely related to the 8644A/B, 8645A, 8664A, 8665A/B .

In that family, the 8644A, 8645A and 8665A were all released together in 1989 (see also HP Journal issue from October 89). The 8665B appeared in the 91 catalog. The 8643A, 8644B and 8664A appeared in the 92 catalog :

The HP 8643A 1 GHz/2 GHz and HP 8644B 1 GHz/2 GHz RF signal generators are replacements for the HP 8644A. […]

signal_generators:8643a:8643a_front.jpg

Specifications

Options

(these two are from some test equipment vendor's page, I could not find an official source)

Manuals

Firmware versions

Revision code Date code1) ROM Partno 08643-X Reason for change
3.3.0 2908 87001-87004 Original release of the firmware.
4.0.0 3203 87101-4 Adds firmware to control the new timebase configuration. Corrects the following special functions: 160, 162, 171, 320, 331. Adds special 328: user enabled transient error interrupts.
4.2.0 3409 87201-4 Fixes center frequency accuracy in FM Mode. Corrects counter diagnostic error 18999.
4.2.1 3449 87301-4 Corrects the calibration error due to the differences between the ALC EEPROMS. Added a diagnostic latch to the ALC module. Fixed a potential divide-by-zero error in the attenuator driver module.

8643A DCU ROM 4.2.1 @ KO4BB

repair & misc info

Youtube repair videos :

Photos of internal modules

signal_generators:8643a:8643a_inside.jpg signal_generators:8643a:8643a_dcu_08645-60101.jpg signal_generators:8643a:8643a_attenuator_08644-61109_or_08643-60205.jpg

1)
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