Capacitor Leakage.

Can someone tell me what is a normal/acceptable amount of leakage on electrolytic capacitors? I'm playing with my new cheap component tester and it usually says under 1%. occasionally 1.something for a larger older one. I have 2 cases where it was above 2%. Both on 1 big and 1 small electrolytic so I changed them just in case. I also have a Blue ESR meter but there are capacitors in certain ranges that are hard to read the graph for.

Thank You

Percentage of what? Leakage is measured in uA usually, and the specification for a family of capacitors usually quotes expected leakage as a function of capacitance and working voltage.

What do you mean by leakage, and as a percentage of what Or do you mean DC current flow once the capacitor is fully charged (as if there was a bypass resistor) stating 1% doesn't mean much, but 1% of charge/minute or 1% reduction in stored voltage/minute does


new cheap component tester

link please.

Thanks Tom.... :)

I had the same trouble a month ago :

The tester just reports a % of leakage. I suspect it's just a comparison of voltage applied vs what comes up missing when it's put through the cap. I am finding a hard time finding the words to describe what I am talking about but we used to call it "Pulled down by a bad cap" in the old days.

Here Tom

I think that the percentage leakage current doesn't mean anything. It is what that devices makes of it.