For example: Agilent E4440A or Anritsu 68369
Voltmeter
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Keysight / Agilent 312A Overview
The HP Agilent 312A Frequency Selective Voltmeter which is easy to operate and capable of making transmission and noise measurements with unparalleled speed and accuracy. Some of the other features of the HP 312A include built-in AFC circuitry, internal CAL output (1MHz) and digital frequency readout.