diode & capacitor check

metebalci · 25th July 2004, 08:03 PM

Hi,

What measurements with DMM do you make to check whether a diode or a capacitor is undamaged or not ?

Thanks in advance.

MB

thomas997 · 26th July 2004, 05:53 AM

For a capacitor, discharge it by putting a load across or just by shorting the leads (may be dangerous).

Then connect the meter, resistance will continue to increase until it is read as Infinite. You should also condition the capacitor if it is old. Do a search for capacitor conditioning.

For a diode, some meters have a diode tester function.

Or you can hook up a battery and an LED with the diode in series in the correct way. Then flip the diode, and the LED should go off.

25th July 2004, 08:03 PM	#1
metebalci diyAudio Member Join Date: Feb 2004 Location: Istanbul/TURKEY	diode & capacitor check Hi, What measurements with DMM do you make to check whether a diode or a capacitor is undamaged or not ? Thanks in advance. MB

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26th July 2004, 05:53 AM	#2
thomas997 diyAudio Member Join Date: Feb 2004 Location: Vancouver	For a capacitor, discharge it by putting a load across or just by shorting the leads (may be dangerous). Then connect the meter, resistance will continue to increase until it is read as Infinite. You should also condition the capacitor if it is old. Do a search for capacitor conditioning. For a diode, some meters have a diode tester function. Or you can hook up a battery and an LED with the diode in series in the correct way. Then flip the diode, and the LED should go off.

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