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Registered Member #60240
Joined: Mon May 16 2016, 07:01PM
Location:
Posts: 304
To all electronics freaks
Please, does anyone have experience with measuring small capacities around 1 pF? I'm just trying to measure the self-capacitance of an electrostatic voltmeter, but so far with no real success.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
If you have equipment to work at radio frequencies then you can measure the change in frequency of a resonant circuit when the electrometer is connected.
Registered Member #60240
Joined: Mon May 16 2016, 07:01PM
Location:
Posts: 304
For the two small electrostatic voltmeters I could measure now finally the self-capacitances at 100 kHz, taking into account the capacities due to the geometry of the measuring cables:
Trüb and Täuber, Zurich, 0 - 500 V HP 4277A: 7.1 pF HP 4263B: 6.2 pF
GB instrument, 0-300 V. HP 4277A: 10.5 pF HP 4263B: 10.0 pF
Within the experimental error there is a good agreement of the values of these two different LCR instruments. The way is now free for the measurement of the insulation resistances due to observing the decrease of a short time applied voltage as a function of time.
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measuring small capacities around 1 pF
