Furnace capacitor testing

[Plumber69]

Will this multimeter test capacitors? If so how do you test them. I'm more referring to furnace capacitors 5mf to 10mf

 

[Reach4]

Will this multimeter test capacitors? If so how do you test them.

Yes and no.

For a qualitative test, put the meter in the 20 meg position. Expect the display to show non-infinite briefly when you connect the probes to the isolated terminals. Then back to infinity. Reverse the leads, and get a slightly less brief non-infinity.

But to measure the capacitance, you need one with a capacitance setting.

 

[Sponsor]

 

[WorthFlorida]

Most caps for motors are electrolyte, a liquid inside the cap. When they go bad generally they swell near the blade connectors are or they leak oil. Some have a blow out valve. I never had a cap tester, I always used a meter like yours.

 

[Reach4]

https://www.cde.com/resources/technical-papers/CDE-Motor-Run-Capacitors.pdf discusses construction of motor run capacitors.