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Old 26th August 2009, 08:22 AM   #1
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Default Dented ASC Caps

Hi,

I brought some ASC 50uf caps and 2 of them have dents at the side (prob damaged from shipping). Is it safe to use dented oil caps? Thanks.

Cheers,
Marcus
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Old 26th August 2009, 04:07 PM   #2
alejo is offline alejo  Argentina
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Please take a photo,
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Old 26th August 2009, 04:29 PM   #3
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I'd at least put a meter across it and verify the films didn't somehow get shorted against each other.
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Old 27th August 2009, 02:47 AM   #4
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They both measured around 49uf on a fluke meter. No shorts. So I guess I will go ahead and use them.

Thanks.
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Old 29th August 2009, 02:57 PM   #5
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I have some ampohm paper-in-oils that arrived dented. They work fine though!
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Old 31st August 2009, 05:23 AM   #6
casouza is offline casouza  Brazil
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There are two simple ways to measure cap leakage (lacking a capacitor tester):

Simple procedure: set your Ohmeter to its highest Meg Ohm range, connect leads to cap tabs; the cap should briefly approach zero ohms then resistance will go up as the cap charges and should read infinity when fully charged. A reading of a few Meg Ohms or anything lower means the cap is damaged.

Slightly more complicated test: connect a 1K resistor in series with the positive tab, then connect the cap to a sufficiently high DC supply, no load after or across the cap. Measure voltage across the 1 K resistor after the cap fully charges and stabilizes.
One Volt means one mA of leakage. Throw away caps that show ANY leakage, no matter how small. They mean trouble down the road.

Good luck and watch the B+, it bites!
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