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Old 12th Sep 2019, 1:01 am   #1
Sinewave
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Default Capacitor leakage tester

Since the best way to test capacitors is testing for leakage, I wonder if anyone here either has a good leakage tester for sale or some drawings for a good home brew leakage tester? Thanks.
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Old 12th Sep 2019, 1:53 am   #2
suebutcher
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Default Re: Capacitor leakage tester

From my notebook, here's a quickie design for testing high voltage capacitors at 100V and 200V using junk box parts. I later modified it to give an extra 50V range using the secondary centre tap. The "short" function is to discharge the capacitor after testing or reforming, only to be used with the meter off!
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Old 12th Sep 2019, 6:23 pm   #3
sven_swe
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Default Re: Capacitor leakage tester

Hi,

I built the same as discussed in this thread and it works really well:

https://www.vintage-radio.net/forum/....php?p=1077022

Also I might have a Heathkit IT-11 capacitor checker for sale, it's a very nice unit. It's a 110V but a step-down transformer comes with it.
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Old 12th Sep 2019, 7:32 pm   #4
Electronpusher0
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Default Re: Capacitor leakage tester

Quote:
Originally Posted by sven_swe View Post
Hi,

I built the same as discussed in this thread and it works really well:

https://www.vintage-radio.net/forum/....php?p=1077022

Also I might have a Heathkit IT-11 capacitor checker for sale, it's a very nice unit. It's a 110V but a step-down transformer comes with it.

I built a modified version of this tester, see post 10 of the thread. It's still working very well.

Peter
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Old 12th Sep 2019, 10:04 pm   #5
Sinewave
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Default Re: Capacitor leakage tester

Thanks guys, I shall take a good look.
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Old 13th Sep 2019, 3:01 pm   #6
Diabolical Artificer
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Default Re: Capacitor leakage tester

There's this one I built , see attached. I used my variac to get rid of the divider chain, the thing fitted into a 3" x 2" x 1" deep box. I use mine with one meter to monitor current, another voltage. As a good cap should have a linear dialetic resistance, if you put 350v on the CUT, you should see 35uA or similar leakage. Once used a few times you get a "feel" for a bad cap by the readings of the ammeter and voltmeter.

Andy.
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Old 13th Sep 2019, 3:12 pm   #7
Sinewave
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Default Re: Capacitor leakage tester

Quote:
Originally Posted by Diabolical Artificer View Post
There's this one I built , see attached. I used my variac to get rid of the divider chain, the thing fitted into a 3" x 2" x 1" deep box. I use mine with one meter to monitor current, another voltage. As a good cap should have a linear dialetic resistance, if you put 350v on the CUT, you should see 35uA or similar leakage. Once used a few times you get a "feel" for a bad cap by the readings of the ammeter and voltmeter.

Andy.
Thanks, will take a look into that.
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Old 13th Sep 2019, 7:35 pm   #8
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Default Re: Capacitor leakage tester

Two posts contravening forum rules deleted.
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