Time to reduce some of the little used stuff in the shack. I have a very nice Hewlett-Packard #331 total harmonic distortion meter for sale, works like new but no manual, easily available on I'net. Here's published specs:
HP 331A Distortion Analyzer. This unit measures total distortion levels of 0.1%-100% full scale in 7 ranges at any frequency between 5 Hz to 600 kHz harmonics are indicated up to 3 MHz. 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 than 80 dB Input Impedance: 1Mohm +/-5% shunted by <70pF Voltmeter Range: 30uV to 300V rms full scale (13 ranges) 10 dB per range. Dimensions: 16 3/4" x 5" x 13 1/4"
I found the prices on this unit vary all over the place ($650 down to $75), I'm asking $75 plus shipping (around $20 - $25), or pick up in northern NJ just off I-80.
Call at 908 362 8502 or e-mail
lawshd@blair.edu
