capacitor testing question

Jan 19, 2005 5 Replies
J

To know if the cap is on value, you need a capacitor testing meter, or such a scale on your volt meter. To see if the cap is functioning properly under working conditions, a capacitor ESR meter is required. The only other reliable way to test them, is to change them.

It is also possible that the motor is defective. I have seen defective motors in appliances from time to time.

--

Jerry G. ======

15 seconds. (On the 200k ohm scale, the resistance slowly rises until it shows "open".) Does this mean that they are bad? Is there any other thing I can test without a capacitor meter?
Vote
Twitter Facebook LinkedIn
R

I have a broken small appliance (food processor) where I think the problem may be with the motor start capacitors. When I try to use the unit, there is a buzz, but the motor doesn't run. There are 2 capacitors labeled "motor start". Both are rated for 170 VIC. One is 100 mF; the other is 130 mF. All I have for testing is a digital multi-meter. When I test both of the capacitors on a high-resistance scale, they seem to pass current for about



15 seconds. (On the 200k ohm scale, the resistance slowly rises until it shows "open".) Does this mean that they are bad? Is there any other thing I can test without a capacitor meter?

Vote
Twitter Facebook LinkedIn
A

No, on the contrary: it's normal. You're charging the capacitor up. Current slows and finally stops as the voltage on the capacitor approaches that of your multimeter. Try measuring the voltage across the capacitor afterwards: you'll see it discharge through the meter.

Vote
Twitter Facebook LinkedIn
M

I doubt it. Have a better look; you should replace them (if necessary) with the correct values.

Vote
Twitter Facebook LinkedIn

Join the Discussion

Have something to add? Share your thoughts — no account required.

Didn't find your answer?

Ask the community — no account required