Reform Capacitor

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Michael L
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Posts: 474
Joined: Tue Feb 19, 2013 5:10 pm
Location: Shrewsbury

Reform Capacitor

Post by Michael L » Fri May 04, 2018 10:36 am

I've just bought myself an fleabay Peak ESR70+ and used it to test a an Elna Cerafine 500V 100μF+100μF. One of the elements was ESR >40Ω on initial test but subsequently 20.8Ω and 45μF and now back to >40Ω same capacitance. The other element measures 91μF and ESR 5Ω.
Am I correct in believing the cap/s may be ok after re-forming? If so, what would be the easiest way. I have a 2x30V lab psu with current limiting which I could use to apply 60V but I think I need to apply something near the rated voltage with an appropriate limiting resistance. If I need to apply the rated voltage to re-form , why is that?

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Nick
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Posts: 11308
Joined: Sun May 06, 2007 10:20 am
Location: West Yorkshire

Re: Reform Capacitor

Post by Nick » Fri May 04, 2018 10:42 am

Resistance isn't futile it's V / I.

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