XPost: sci.electronics.design   
   From: cd@notformail.com   
      
   Hi all,   
      
   Using my Peak ESR/Capacitance meter, I was carrying out in-circuit   
   checks on large electros in the linear PSU I've previously mentioned   
   here. I was getting a lot of "in-circuit/leaky" warnings for two of   
   them, so I pulled them out completely and am getting the same warning   
   when they're checked out of circuit, which surprised me as it's   
   unusual IME. Anyway, the leak would have to be very bad to result in   
   ripple, would it not? AFAIK, the leading culprit for ripple is caps   
   which have lost a significant amount of capacitance or else developed   
   a very large ESR.  Do I have that right?   
   I'd like a "second opinion" as it were on the leakiness of these caps.   
   What's the best old-school method for testing for this? I just want to   
   ensure the ESR meter isn't faulty (highly unlikely but the possibility   
   must be eliminated to be sure).   
      
   CD.   
      
   PS: the aforementioned caps are 47000uF 16V Vishay ones - and I have a   
   brand new spare that's also testing as "leaky"!   
      
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