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/diy/ - Do It Yourself

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103776 No.103776 [Reply] [Original]

I'd like to test some electrolytic and film capacitors for any leaking or problems before I install them in a circuit. What setting would be best to use on a multimeter with a control interface similar to the one pictured?

>> No.103791

hFE

>> No.103793
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103793

thx!

>> No.103794

hook up a clean voltage source to a battery. charge capacitor. then measure series current.
any current flow is leakage.

>> No.103857

could you dumb that down a bit? I'm just getting my feet wet with electronics. whats a clean voltage source? how do I charge the capacitor? whats series current?

>> No.103891

>>103857
Ok dumbed down.
Use a power supply.
The capacitor is charged by connecting the positive and negative leads to the legs of the capacitor. Make sure you have the polarity right where it matters (electrolytic caps are polarized.)
By series current I just meant measure the current, which is done by attaching your multimeter probes to the circuit in series.
If none of this makes sense, hit the books.

>> No.103900

Use ohm meter. Place leads across cap, then reverse polarity. Meter should read really high then go low.or maybe the other way around. You really need an esr meter

>> No.103921

More ways, or the way to know if a capacitor is good or bad? not op.

>> No.104292

>>103921
Check the output voltage. It should be within the listed tolerance.

I had a 450v cap that was +/- 150v from the schematic listed 400v...waayyy out of spec. Old wax & paper electrolytic.

New cap was steady at about 402v.