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Old 25th July 2004, 03:17 PM   #1
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Default NOS capacitor testing ?

I have a few NOS Marcon 15,000 uf 63v caps. Probably
20+ years old. The few times lately I have used any of them I haven`t had any problems but is there any way to tell if they
are drying out or how much useful life they have left.

Thanks,

Woody
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Old 26th July 2004, 03:59 AM   #2
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Default Where are the capacitor guru's ?

No one seems to have replied to this.

If your capacitor measures out OK for capacitance , I think the electrolyte probably is intact. Remember that most electrolytic caps are +/- 20 % of the label value.

If your leakage resistance is low it probably has passed its mid life !
That will cause it to heat up and slowly die. Check the ripple on it while working and see if it is in the normal range. If it is, I guess it will last long enough.

Then again I am not a capacitor guru . You should google for 'reconditioning old electrolytic capacitors' . There were some nice writeup's that I saw a while ago.
Cheers.
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Old 26th July 2004, 04:46 AM   #3
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You need to reform them since they've been in storage for so long. Probably best to create a power supply circuit that's adjustable to 60V. Then go 10v at a time til you get to 60V. You'll aso need a load past the cap which will also act as a bleeder to drain the voltage after you turn it off. Probably about 20 hours at each stage. Don't proceed if the cap gets hot - this means there's internal resistance - let it stay at one voltage til it's not hot.
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