For Sale: HEWLETT-PACKARD 331A Distortion Analyzer, Late Model
formatting link
DESCRIPTION: This is the classic solid state workhorse distortion analyzer. Covers 5 Hz to 600 Khz. Measures THD down to 0.03%. It also doubles as a highly accurate AC Voltmeter with voltage and dB scales.
SPECIFICATIONS: Freq Range: 5 Hz to 600 Khz Distortion Range: 0.1 % to
100% Full Scale Residual Distortion: less than -70 dB (0.03%) Accuracy: +/-3% over 10 Hz to 1 MHz with fundamental input less than
30V to 0.3% THD Fundamental Rejection: Greater tham 80 dB Input Impedance: 1Mohm +/-5% shunted by