From: peterwieck33@gmail.com   
      
   On Thursday, July 6, 2023 at 11:51:06 AM UTC-4, Dan Green wrote:   
   > Hi all,    
   >    
   > Is it advisable to change old electrolytics which are reading a    
   > capacitance considerably higher than their stated value? I know they    
   > vary a lot anyway, but if I have say a 480uF cap which is reading    
   > 640uF, should that be a concern? Does it indicate some underlying    
   > issue with the cap?   
      
   When any capacitor starts to read "high", that is the first sign of leakage.    
   CAVEATS:    
   a)  An unmarked (electrolytic) capacitor may be anywhere from -10% to + 100%   
   of rating. Modern caps, (made since 1990 or so) tend to be -5% to + 20%.    
   b)  Beware outliers  - if you have a dozen caps of the same rating and voltage   
   from the same manufacturer from (approximately) the same lot, they should all   
   be within a few % of each other. One that tests more than 5% low or 15% high   
   in that lot from the    
   average will be suspect.    
   c)  And why it is that I keep an ESR meter as an additional screening tool   
   over just capacitance.    
      
   Peter Wieck   
   Melrose Park, PA    
      
   --- SoupGate-Win32 v1.05   
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