HP 8405A Vector Voltmeter with Option 002
Measurement Options Include insertion loss and group delay of passband-filters and other transmission devices, gain and phase margin of amplifiers, complex impedance of mixers, antennas, etc. in the frequency range of 1 to 1000 MHz.
2 Channel, each with Probe or BNC Input
Option 002 provides Linear dB Scale
This vector voltmeter came to us from a retiring electrical engineer who used this in his calibration and product development electronics lab.