HP 331A Distortion Analyzer
Solid state instrument for measuring distortion and AC voltages.
Distortion Analyzer 5Hz to 600KHz, 0.1% to 100% Total Distortion
Voltmeter Range 300uV to 300V RMS F.S.
This HP 331A Distortion Analyzer came to us from a retiring electrical engineer who used this in his calibration and product development electronics lab.