The HP8970A noise figure meter takes the mystery out of noise figure measurements, making them easy, accurate and repeatable. The HP8970A can be used with the 346 or 347 family noise sources. Low instrument uncertainty and automatic second-stage correction make it possible to make accurate noise figure and gain readings, even for low-gain devices. The instrument has special measurement modes for mixer measurement and is capable of controlling external local oscillators and the HP8971B/C noise figure test set. Frequency range: 10 MHz to 1600 MHz. A major draw back is that only one ENR table can be stored. That's why its successor, the HP8970B, was introduced.