20-08-2017, 05:42 AM
(19-08-2017, 10:14 PM)Mark Hennessy Wrote: I gave up trying to measuring the input impedance in mV range - with the AN8002 (and the AN860B+) I estimated 20GΩ, but the AN8008 was even higher. I was using a 33M resistor. Funnily enough, I tried the same test with the Uni-T UT61E earlier today, and the voltage doesn't change at all! Once upon a time, such high input impedances were the preserve of bench multimeters - it's really quite remarkable what you can get today.
The thing is, with impedances like that, environmental conditions come into play. A humid day can change everything
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