Re: [volt-nuts] Precision high resistance measurements / calibration of HP 4339B high-resistance meter.

Oops - I think I didn't send this message properly yesterday - here goes again. Ed Yes, David, unless you go to very extreme measures, you won't see real R values that have any practical meaning beyond E12 ohms or so. Most practical insulation Rs may be around E12-E14 tops, unless you go to

Re: [volt-nuts] Precision high resistance measurements / calibration of HP 4339B high-resistance meter. Fix?

On 2 March 2018 at 09:22, Andre wrote: > Maybe one bad resistor? I've read that tin whiskering can occur even on > relatively recent equipment, slower than lead free but still a problem. > I'd do a visual inspection just to see, shouldn't be an issue. > -A > An issue with

Re: [volt-nuts] Precision high resistance measurements / calibration of HP 4339B high-resistance meter. Fix?

com> on behalf of Dr. David Kirkby <drkir...@kirkbymicrowave.co.uk> Sent: 02 March 2018 03:16:24 To: Discussion of precise voltage measurement Subject: [volt-nuts] Precision high resistance measurements / calibration of HP 4339B high-resistance meter. I pickup up an HP/Agilent (front says H

[volt-nuts] Precision high resistance measurements / calibration of HP 4339B high-resistance meter.

I pickup up an HP/Agilent (front says HP, rear says Agilent) 4339B high-resistance meter from eBay. The 4339B has an internal supply up to 1000 V, an ammeter to measure current, and obviously computes resistance from Ohms Law. It is supposed to work up to 16 Peta ohms (1.6x10^16 ohms), which would