[volt-nuts] How can I make a 2000 V DC meter with an input resistance of at least 100 T ohms?

[Neville Michie]

Improvise by holding a metal disk over an electronic balance and measuring the force of attraction.
Calibrate it with a lower known voltage.

cheers,
Neville Michie
> On 23 Mar 2018, at 12:58, Dr. David Kirkby <drkirkby at kirkbymicrowave.co.uk> wrote:
> 
> On 23 March 2018 at 01:49, kc9ieq via volt-nuts <volt-nuts at febo.com> wrote:
> 
>> How about using (or building) an additional 2kV power supply and a
>> sensitive meter movement like a differential voltmeter, adjusting
>> for/measuring the null?  Impedance at null will be theoretically infinate,
>> current will be theoretically zero, and you can measure/monitor the voltage
>> of your second supply directly with the probe/meter of your choice.
>> Regards,Chris
>> 
> 
> No, that will not work for me, as while the impedance at null is infinite,
> it is not when not nulled, and that will mess up the measurements.
> 
> Absolute accuracy is not important. +/- 10% or even 20% would be okay. I
> want to measure a couple of voltages and compare them. As long as the meter
> reads the same with identical input voltages, that is fine.
> 
> Dave
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