How much ohms it will read if it is good, or what can of reading I should get if not good
![]() |
How much ohms it will read if it is good, or what can of reading I should get if not good
A capacitor doesn't really have any "resistance". It does have an "impedance" but not a resistance. With a direct current applied to it, after the capacitor has fully charged, you'll see a near-infinite resistance. You might see an apparent low resistance at first, but the apparent resistance will quickly rise to at or near infinity. Appliance capacitors do have some leakage, so you might see a finite, but high resistance.
If the capacitor shows a low resistance, it's shot. However, most capacitors fail "open". They basically lose their capacitance. If you don't have a meter that reads capacitance, you probably won't be able to tell the difference between a good capacitor and a bad one -- at least not with an ordinary multimeter.
To test a capacitor.
Set multimeter to OHMS or continuity.
Touch meter leads to capacitor terminals. This charges the capacitor.
Reverse leads and touch leads to capacitor terminals again. This discharges capacitor.
If you get a momentary current flow the capacitor is good. If not, the capacitor is shorted.
The "good" that hk mentions, I'd change to likely good. You really need to measure ESR or effective series resistance. A cap checker measuring capacitance USUALLY indicates out of tolerance values, but not always.
"bad' is easy. Good is a little harder to tell.
I've even had ~0 ohms for a fuse out of circuit, only for the fuse to fail in circuit.
All times are GMT -7. The time now is 01:19 AM. |