Re: [volt-nuts] nA advice

2015-11-15 Thread Andrea Baldoni
On Fri, Nov 13, 2015 at 01:56:19PM -0500, Charles Steinmetz wrote: > Rob wrote: > > >50V across 5GOhm is 10nA. Put a standard multimeter's 10MOhm input in > >series and > >you have 10mV per nA reading. Anything below 100mV is pass. Yes, Rob. I late also thought about it that way while answering

[volt-nuts] nA advice

2015-11-13 Thread Andrea Baldoni
Hello! I would like to measure insulation resistance of some defective load cells. The measurement should be done with no more than 50V and the full scale reading should be >=5Gohm. Accuracy of +-10% is enough (in fact it could suffice just to check if it's >=5Gohm or not). I have not been able

Re: [volt-nuts] nA advice

2015-11-13 Thread Rob Klein
50V across 5GOhm is 10nA. Put a standard multimeter's 10MOhm input in series and you have 10mV per nA reading. Anything below 100mV is pass. My 2 eurocents. Rob Klein Op 13-11-2015 om 17:15 schreef Andrea Baldoni: Hello! I would like to measure insulation resistance of some defective load

Re: [volt-nuts] nA advice

2015-11-13 Thread Charles Steinmetz
Rob wrote: 50V across 5GOhm is 10nA. Put a standard multimeter's 10MOhm input in series and you have 10mV per nA reading. Anything below 100mV is pass. Also, quite a few of the Fluke portable and handheld DMMs from the last 35 years or so (including the faithful old 8050A and the