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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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