Hello! I have a 0-20kVDC variable power supply that I have just recently built. It works great other than I do not know what voltage I am putting out to test things. I do not have a 0-20kVDC meter, but I do have a 0-20VDC meter. I was thinking about using a simple voltage divider to use the 0-20VDC meter to measure 0-20kVDC. Would this work? If so, how would I calculate the resistor values?

R1 on top, and R2 on bottom. Mid-point of R1 and R2 is the output.

20kV ... to R1 .... to R2 .... to GND.

Want 20V DC max at the divider's output. So the 20000 V needs to be scaled (by the divider) down by a factor of 1000.

20V = 20000 * R2/(R1+R2).

R1+R2 = (20000/20) * R2.

Choose R2 to be something.... eg. 100000 ohm.

R1 could then be something like 100 Mega-ohm resistor ..... like a 100 Mega-ohm 25kV; 5 watt resistor.

I'm thinking that extreme care of our health should be taken when working with such high voltage. This is to avoid becoming a statistic.