[TenTec] ESR vs Leakage

[Clayton Brantley via TenTec]

Kim:  In the old days we used a 90 volt battery and a VTVM to check for leakage.  You would isolate the 
cap and hook the battery and cap in series and watch the meter.  A good cap would show the inital
charge then drop towards zero volts.  A bad cap would show almost the battery voltage.  Using just
an ohm meter would not give you a valid leakage reading.  I have never had nor used an ESR meter
but I think the above test would give similar results.

73 Clayton N4EV
Egad, I'm telling my age!



On Wednesday, July 9, 2014 11:00 PM, Kim Elmore <cw_de_n5op at sbcglobal.net> wrote:
 


There has been discussion here about capacitor ESR in the past. I don't 
have an ESR meter, but I removed and checked some of the suspect 
capacitors. Can ESR be related to DC leakage? None of the ones I removed 
appear to be leaky with a DC resistance on the order of a few megohms. 
Does this equate to low ESR or is there no reliable relation save that 
leaky capacitors are always bad?

Kim N5OP
-- 

Kim Elmore, Ph.D. (Adj. Assoc. Prof., OU School of Meteorology, CCM, PP 
SEL/MEL/Glider, N5OP, 2nd Class Radiotelegraph, GROL)

/"In theory there is no difference between theory and practice. But, in 
practice, there is." //-- Attributed to many people; it's so true that 
it doesn't matter who said it./

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