From: terrell.michael.a@gmail.com   
      
   On Thursday, May 28, 2020 at 3:54:41 PM UTC-4, Ralph Mowery wrote:   
   > Today I received one of the roughly  $ 20 component testers.  Checking    
   > it out and comparing capacitors I notices a big difference in a couple    
   > of them   
   >    
   > I was using a Fluke 87,  a LCR meter from China, an older component    
   > tester and the new component tester.   
   >    
   > The first capacitor was a Sprague .06 uF 600V.  Two China testers showed    
   > near the value.  Within the 10%  tollorence,    The LCR tester showed it    
   > to be .08 and the Fluke as .1 uF.   
   > This is a new,but very old capacitor.   
   >    
   > Next capacitor was a 20 year old no name of .068 of 50 V made with the    
   > Poly something dielectric.  All meters were with in less than 10 %.  Ok    
   > here.   
   > Same results with a newer one of .01 uF .    
   >    
   > Next came a Silver mica.  It is .01 at 600 V. Fluke shows up at .0150,    
   > LCR at  .0120.  Two component testers were close and in spec.   
   >    
   >    
   > What gives with some capacitors checking like they should and some being    
   > way off, not just 10 % or so ?  I ran the tests several times on each    
   > capacitor to see if maybe the leads were not making good contact and any    
   > other similar thing I may have missed like having my fingers across the    
   > leads.   
   >    
   > Ralph ku4pt   
      
      
      The first two are wound, and the third is multi layer. Winding adds some   
   inductance, if the ends are not fully bonded their entire length. That added   
   ESL will change the reading. Silver Mica are designed for low ESR in RF   
   applications. .01 and .06 uF    
   are more use at lower frequencies.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)