Agilent / HP / Keysight 5351B

This Frequency Counter features microwave components that are integrated on a single hybrid gallium arsenide (GaAs) circuit for added speed and reliability.

This distinguished by wide frequency coverage, exceptional sensitivity, fast tracking, high measurement throughput, and wide FM tolerance.

Built in microprocessors provide math functions, including measurement scaling and offset.

Automatic amplitude discrimination measures the frequency of the highest amplitude signal in a multi signal environment.

A full set of diagnostic routines provides general information and troubleshooting.

This integrates easily into test systems.

English like commands simplify integration with other components, and the easy to read liquid crystal displays can serve as message centers for the system.