Hi, I have a High Voltage supply on an integrated cirquit board installed in a Pentium I computer, that (in theory) can give a 0-3200 V Bias Supply to a Germanium detector, and only 0-1000V multimeters to test with. I have a Soviet analog multimeter, a cheap new one (digital) and professional-looking Digital Multimeter. Their readings only agree up to a poin (200 V maybe), but they all seem to suggest that the High Voltage Bias Supply that I'm testing is out of order. It worked for over 20 years, but now I can't get a normal spectra with this spectral analyzer anymore. I need help diagnosing this plate. How can I test High Voltages with very low currents accurately? The plate is propriatery, so the manufacturer doesn't include a scheme.