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High voltage, high impedance voltage measurement?
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David Hess:

--- Quote from: uski on September 04, 2024, 05:47:10 am ---I am currently playing with geiger muller tubes. I would like to verify what is the voltage that i am powering them with.
They use a high voltage, high impedance power supply. None of my voltmeters have a sufficiently high input impedance and they dramatically affect the voltage / power supply circuitry.
--- End quote ---

Most DC voltmeters have a 10 megohm input resistance at high voltages, so I will assume that is the case here.


--- Quote ---Does anyone have a good idea as to a way to measure DC voltages in the range of 0-1000V (ideally 0-1500V) that does not cost me one kidney?
--- End quote ---

What kind of loading is permissible?

For cheap, I would buy a pair of 5 gigohm resistors, place them in series for 10 gigohms, and put those in series with the 10 megohm input of my voltmeter making a 1000:1 divider and presenting a 10 gigohm input resistance.  Now the 2 volt range on my multimeter measures to 2 kilovolts with 0.1 volt resolution.

I would use two 5 gigohm resistors in series simply because a similar 10 gigohm resistor is much more expensive.

A high voltage high impedance buffer, like that used in an electrometer to make high voltage measurements at high impedance, would be a fun project but requires a high voltage power supply which is a project all by itself.

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