Electronic repair thread

esr is just a characteristic of capacitors, so the number by itself tells you nothing unless you have documented ratings (or brand new caps) to compare with. typically neither is available to you, unless you bought the caps yourself from a reputable supplier.

as for testing ESR, there are youtube videos showing how to do it with a scope and function generator, if you have those.

>>960677
There are /diy arduino RLC checkers I think you'll be able to find one for yourself easily..

>being on /diy/
>not owning a precision LCR bridge

File: 100n.jpg (180KB, 600x600px)

180KB, 600x600px

just get one of these $20 everything-testers and you'll be fine

>>960828
not op, i was thinking of getting one of these. are they good enough?
though i didn't know about esr not telling you anything on its own as >>960682 said...

Use a multimeter dumb dumb.

>>960842
Most mutlimeters don't measure capacitor ESR. It's not as simple as just using the resistance setting.

>>960677
With a dmm on resistance, you can watch it bounce to infinite. This is easier on analog, but I find is workable on my digital. If the resistance stays low or doesn't give me any response, then there's a red flag.

You can use a scope, generator, and some math.