For example: Agilent E4440A or Anritsu 68369
Frequency Counters
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Tektronix CDC250 Overview
The CDC250 175 MHz Universal Counter measures frequency of sine,square and triangle waves from 1 Hz to 175 MHz at input levels from 20 mV to 42 V peak.
The CDC250 also provides period measurements, frequency ration, time interval, and totalize measurement functions.
The CDC250 has a +- 1 ppm/year, temperature-compensated time base to ensure consistent accuracy.