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Old 8th February 2003, 02:45 PM   #1
jim is offline jim  Belgium
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Default Testing paper-in-oil capacitors


I've got a few NOS paper-oil capacitors.
Since I don't want to blow up my powertubes I
want to test the capacitors before soldering them in.
Is there a simple method to measure the leakage current.


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Old 8th February 2003, 03:27 PM   #2
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What I do is hook it up to a 1-200V supply with a neon light in series. The rate at which the light flashes as compared to the capacitance is determined by the leakage current.
A typical old, sticky .1uF wax-paper type capacitor might go 1 flash every second, which is approx. equivalent to 2.2megs, IIRC. (You can test that by connecting a resistor in parallel with a good capacitor.)

This is safe up to about .5uF, where the pulses start getting dangerous to the light. A 0A3 tube should be used for anything larger.

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