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High voltage, high impedance voltage measurement?
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uski:
Hi!

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.

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?

Thanks!
Fungus:
You could put a very high impedance resister divider across it (something like 1000:1 ratio) and put an op-amp voltage follower on the junction to buffer the voltage for taking measurements.

Cost: A couple of dollars plus a power supply.
Hydron:
I had an answer for you until I got to the bit about a kidney. I'd do it using my Keithley 237 SMU which does up to 1100V, but even such old units are not cheap used (this one used to be a 236 before I upgraded it, though while that means the purchase price was a lot less than most 237s the upgrade process isn't very cheap or easy either).
tautech:
https://www.aliexpress.com/w/wholesale-1000x-voltage-probe.html?spm=a2g0o.productlist.search.0
Someone:

--- Quote from: uski on September 04, 2024, 05:47:10 am ---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 ---
1% of kidney:
https://www.fluke.com/en-us/product/accessories/probes/fluke-80k-40
or try someone "cheaper"
https://www.bkprecision.com/products/component-testers/HV%2044A
https://www.bkprecision.com/products/accessories/210/PR%2028A
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