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ESR Meter #207009 09/13/12 05:09 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

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Re: ESR Meter [Re: KJay] #207011 09/14/12 01:52 AM
Joined: Nov 2005
Posts: 823
J
JoeTestingEngr Offline
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

Re: ESR Meter [Re: JoeTestingEngr] #207028 09/16/12 03:57 PM
Joined: Nov 2007
Posts: 763
K
KJay Offline OP
Member
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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