Measuring high voltage

  • Thread starter triac
  • Start date
  • #1
20
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Hi!
I am looking for a way to measure the voltage on a Kelvin Water Dropper that I've built. This is quite problematic since the charge is small and the voltage is high. The only way to do it, as it seems to me, is to measure by influence. Any suggestions?
 

Answers and Replies

  • #2
816
1
You could also use the field. Some suggestions:
- build a simple Electroscope with an arm that moves up if the device is charged (some have a scale)
- buy an electro field meter
- attach your buckets to a plate capacitor and rotate a coil inside
- measure the force between two capacitor plates
- do something with a cathode ray tube
 
  • #3
133
0
Hi!
I am looking for a way to measure the voltage on a Kelvin Water Dropper that I've built. This is quite problematic since the charge is small and the voltage is high. The only way to do it, as it seems to me, is to measure by influence. Any suggestions?

Build a generating voltmeter. This is a rotating "fan" that alternately covers and uncovers capacitor plates. Feed the plates behind the rotating part to a high impedance scope or other High Z AC meter. AC signal will be proportional to the high voltage without contact. These are commonly used to sense the voltage on Van de Graff generators.
 
  • #4
20
0
Ok, thanks for your help!
 
  • #5
taylaron
Gold Member
391
1
Build a generating voltmeter. This is a rotating "fan" that alternately covers and uncovers capacitor plates. Feed the plates behind the rotating part to a high impedance scope or other High Z AC meter. AC signal will be proportional to the high voltage without contact. These are commonly used to sense the voltage on Van de Graff generators.

How can this work if Van De Graff generators produce DC power?
 
  • #6
SpectraCat
Science Advisor
1,399
2
How can this work if Van De Graff generators produce DC power?

The rotating "fan" alternately shields and exposes the voltage on the target, producing an AC signal via capacitive coupling.
 

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