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Old 30th Nov 2016, 10:18 pm   #37
crackle
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Join Date: Mar 2011
Location: Basildon, Essex, UK.
Posts: 4,100
Default Re: 'THAT' Capacitor. What is it?

If you are checking a capacitor for DC resistance, which as mentioned earlier should in theory be near infinity, you should measure with a voltage source close to the working voltage of the capacitor. If the capacitor allows any DC current (fractions of mA's) to pass at this voltage then it is said to be "leaky" i.e. leaking current. (not necessarily leaking its contents)
The degree of leakage allowable depends on the application of the capacitor, but in the case of the audio coupling capacitor, if it shows any leakage then replace.
ESR meters like the PEAK ESR60 are really only useful for higher value capacitors like electrolytics, ideally the ESR should be zero.

Mike

Last edited by crackle; 30th Nov 2016 at 10:23 pm.
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