High Voltage and measurement instruments

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SUMMARY

The discussion focuses on measuring high voltages (up to 60kV) using an ammeter with an input resistance of approximately 300 ohms. The user, Sara, seeks to achieve a precise resistance ratio of 1/(10^6) between the ammeter's input resistance and the high voltage supply's output resistance. Suggestions include using a potentiometer to adjust the resistance values to obtain the desired ratio. The importance of having a high input resistance for voltmeters is also emphasized.

PREREQUISITES
  • Understanding of high voltage (HV) concepts and safety measures
  • Knowledge of ammeter specifications and functionality
  • Familiarity with potentiometers and their applications in resistance matching
  • Basic principles of electrical resistance and Ohm's Law
NEXT STEPS
  • Research methods for calculating and adjusting resistance ratios in high voltage applications
  • Learn about the specifications and usage of different types of ammeters
  • Explore the design and application of potentiometers in electrical circuits
  • Investigate safety protocols when working with high voltage equipment
USEFUL FOR

Electrical engineers, technicians working with high voltage systems, and hobbyists interested in voltage measurement techniques.

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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