Used Keysight / Agilent 5340A Frequency Counter, 10Hz to 18GHz

The Agilent / HP Model 5340A Frequency Counter measures frequencies from 10 Hz to 18 GHz. Sensitivity is -30dBm (7.07 mV) from 10 Hz to 500 MHz, -35dBm (3.98 mV) from 500 MHz to 10 GHz and -25dBm (12.6 mV) from 10 GHz to 18 GHz. The counter makes direct measurements from 10 Hz to 250 MHz and uses an automatic transfer oscillator technique for frequencies above 250 MHz. Features include a single input connector for the entire frequency range, excellent AM and FM characteristics, eight-digit display, auto-amplitude discrimination, variable resolution from 1 Hz to 1 MHz, fast acquisition time, and wide dynamic range.