HP 8657B

This used HP 8657B is an upgraded version of the popular 8657 series synthesized signal generator, offering extended frequency coverage and improved specifications over its predecessor. It remains a favored choice among RF technicians for its combination of accuracy, stability, and straightforward operation. The unit is sold used and shows typical wear consistent with continued service in a professional test environment. Engineers rely on the 8657B for tasks such as testing RF receivers, evaluating amplifier linearity, and generating reference signals for calibration procedures. Its synthesized output provides low phase noise and precise level control, both of which are important when working with sensitive RF and communications equipment. The instrument supports GPIB remote control, allowing it to function within automated test systems as well as on the manual bench. This generator is a practical match for communications labs, repair facilities, and calibration services that need dependable RF signal generation without the cost of newer instrumentation. Its extended capabilities relative to the 8657A make it an attractive option for buyers who want a bit more range and performance from a proven HP platform.