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

[Bruce Griffiths]

Vibrating capacitor non contact field probe in feedback loop to create a voltage follower:

https://www.monroe-electronics.com/ESD/pdf/244a_m.pdf

Bruce

> 
>     On 23 March 2018 at 15:12 Neville Michie <namichie at gmail.com> wrote:
> 
>     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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> >     > 
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