I bought an HP 4339B high resistance meter. It is designed to measure high resistances (as the name suggests) and also low currents. It is essentially a variable voltage source up to 1000 V, and a low current ammeter.
I got it from eBay, as non-working, with no output voltage. After paying for it, I thought I had bought a lemon, as it became apparent the seller had more than one of these, and his lab had switched parts to try to get one working. I thought I was going to end up with a paperweight. Unable to do any tests on it due to lack of suitable connectors, I took Keysight (UK) up on the offer of a free technical evaluation of this - Keysight even pay the shipping charges! Much to my surprise, they sent me a 4 page technical report http://www.kirkbymicrowave.co.uk/tmp/Measurement-report-As-received_1-9690444179-1.pdf with far more useful information than on most cal certificates I have seen. I don't think this is a full calibration, as resistance measurements are only made with voltages up to 100 V, and the highest resistance used is only 10^11 ohms. But the report shows. * The output voltage is working, and within the specification. This was nice, as I was told there was no output. * Resistance measurements are within specification too, although I suspect the meter has not been pushed to its limits on this free technical evaluation. * Current measurements are a bit out of spec. A test current of 10 nA, there's an error of about 0.082 nA, but the specification is an error of 0.063 nA or less. Given it works to some extent, I thought I'd pay Keysight for a full calibration, to find just how good/bad it really is. Keysight have it now, and I expect to get it back next week, with a full calibration report. In order to use the meter, I would obviously need to be able to make connections to it. Is there anyone here that knows what the triaxial (tri-axial?) connector in the attached pictures ? One picture is of the female on the 4339B and the other the male plug on a fixture that I don't have. The picture of the meter is not the one I have, since the meter is at Keysight. But it has a better picture of the triaxial connector than the meter I have. Does anyone have a bit of trixial cable with one of these connectors on? I stuck a bit more information about this on the Keysight multimeter forum, https://community.keysight.com/thread/26937 but there have been no replies on there. I don't know if is considered a multimeter or not. Maybe the people that read that forum don't support this meter. https://community.keysight.com/thread/26937 Dave
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