High Voltage and measurement instruments

AI Thread Summary
The discussion revolves around using a high voltage (HV) supply of up to 60kV in conjunction with an old ammeter to measure voltage accurately. The user seeks to achieve a precise resistance ratio of 1/(10^6) between the ammeter's input resistance and the HV supply's output resistance. They mention the ammeter has an approximate input resistance of 300 ohms, and they are considering adding a potentiometer to adjust the resistance. Clarification is requested on how to configure the potentiometer to achieve the desired ratio. The conversation emphasizes the importance of high input resistance for accurate voltage measurement.
sara39
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Hi all,
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
 
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Give some more details please. Any voltmeter should have a high as possible input resistance. You say you found an ammeter? Is this just a meter movement? Do you know any specs on the meter?
 
Hi,
i've included a picture which might help. HV is applied to an ammeter of about 300ohms input resistance (Rm) and i know that the output resistance of my supply is 10^6 times greater, (well not exactly) adding extra resistances would help give me an exact ratio of 1/10^6. how can i measure this ratio? I hope i make sense:)
 

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