Testing capacitors
Marky P wrote:
Hi,
Is it possible to test capacitors reliably without a capacitance
meter?
Marky P.
By test, do you mean "is it working ok?" or do you want to measure the
value accurately?
For a quick and dirty test, just connect a multimeter on the ohms range.
The needle should flick across to short circuit, then drop back towards
high resistance. The time it takes to drop back is proportional to the
value of the capacitor. If the needle ultimately drops back to open
circuit, the cap is probably ok. For a more complete picture you need a
proper capacitor that will do several things - measure the actual
capacitance, put an appropriate voltage across it, measure the ESR and
the leakage resistance.
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