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Gridiron · 24th Aug 2011, 1:24 pm

I use a Taylor Model 130C insulation tester, this has 250 and 500 volt ranges and a "Push to Charge" button and reads up to 1000 Megaohms and is mains powered. I would guess it dates from the sixties.
Most waxed paper caps are bad, measuring between 50k and 1M, American types are sometimes better than UK ones. The Sprague metal can types from just after WW2 are better, these seem to be around 50Mohms which is OK in most circuit positions. Modern types after charging read infinity.
Regards, Mike.

24th Aug 2011, 1:24 pm	#12
Gridiron Heptode Join Date: Apr 2010 Location: West Midlands, UK. Posts: 662	Re: Testing capacitors with a 'Megger' I use a Taylor Model 130C insulation tester, this has 250 and 500 volt ranges and a "Push to Charge" button and reads up to 1000 Megaohms and is mains powered. I would guess it dates from the sixties. Most waxed paper caps are bad, measuring between 50k and 1M, American types are sometimes better than UK ones. The Sprague metal can types from just after WW2 are better, these seem to be around 50Mohms which is OK in most circuit positions. Modern types after charging read infinity. Regards, Mike.