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

2018-03-02 Thread ed breya
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?

2018-03-02 Thread Dr. David Kirkby
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?

2018-03-02 Thread Andre
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 From: volt-nuts