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Can anybody help me on HVs, high voltages up to 60Kv? Actually I've got this HV supply , then i came across with an old ammeter in my garage which i thought could help in showing me the exact voltage my supply is transferring but i have a poblem in matching the resistances. actually i want to make an exact ratio of 1/(10^6). the approximate ratio of the ammeters input resistance and the supplies output resistance is 1/10^6, how can i make sure that putting a potentiometer in series or parallel can give me an exact ratio? thanks for your help!

Sara