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reforming capacitors

Posted 16th March 2010 at 02:50 PM by klewis

from AndrewT

Apply 16Vdc through 100k resistor and measure how the resistor voltage varies with time. The resistor voltage is a rough indication of the cap leakage+charging current.
Once charging is substantially over the remaioining current is predominantly leakage +-a little bit of chage/discharge current depending on the stability of the supply.

The apparent leakage is very much affected by the DC supply voltage. A good regulated DC supply that is held at constant temperature will help a lot.

You may find that 6hours at 100k gets to within 105% of the ultimate leakage current. But tell us what you find.

You can reform a bank of caps using one resistor to feed each capacitor.
Measure across each resistor to see how similar or different the caps are.
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  1. Old Comment
    umut1001's Avatar
    Hello.I have some questions.I have some nos capacitors(siemens, sikorel ,rifa ,felsic) but I think i should reform Rifa peh169 63v 15000uf ones first.
    1)They have datecodes but i do not know their meanings.Some of them have BN8 some of them BN9 and BP2.Can you estimate or calculate their ages?I shake them.Some of them sounds more lytic water and some of them have less.What is your commands ?
    2)What is the most reliable voltage and resistor for reforming for my Rifas?
    Thank you very much.
    BR Ümit
    Posted 9th April 2010 at 05:59 PM by umut1001 umut1001 is offline
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