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#207009 09/13/12 06:09 PM
Joined: Nov 2007
Posts: 763
K
KJay Offline OP
Member
When you need to check capacitors on a pcb do you use an ESR meter that can test with them in the circuit or do you lift one leg or even remove them completely to do your tests. I have been contemplating maybe getting an ESR meter, but not really sure how consistently accurate they are when doing tests with the caps still in place on the board.

TKX

KJay #207011 09/14/12 02:52 AM
Joined: Nov 2005
Posts: 826
J
Member
I have seen and changed dozens of open electrolytics and probably a few shorted ones. I don't think I've ever even conceived of trying to measure the ESR or ESL of one. Wouldn't that be a physical property, unlikely to change unless the cap has sustained visible damage. The puffed up caps on Dell motherboards probably have the same ESR as the normal ones. I do check for leakage though.
Joe

Joined: Nov 2007
Posts: 763
K
KJay Offline OP
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I'm not exactly sure yet how these differ from a standard stand-alone cap tester or multimeter with cap test function. Seems the better models of these things are generally a little too pricy for me right now, but I found a cheap ESR made by Blue that I may look into getting later on.



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