Can digital ohmmeters be used to test electric capacitors?
Used on it's own, a digital multimeter set for resistance, will
not give you a value. You can however determine if the capacitor
has totally failed.
If you measure the resistance of an electrolytic capacitor, you should get a rising reading, going from near zero and rising up to maximum resistance. If you then immediately reverse the leads, you should get a negative reading, dropping through zero and then rising again to maximum resistance.
The speed at which this happens is a function of the capacitance. A high value will take longer to change value.
Some capacitors may fail short circuit and this will be immediately evident with a zero resistance reading. Some may fail open circuit, where you will not detect a change in value when reversing the leads, but will instead get an infinity reading.
This only works with high value capaitors, above 5uFd, electrolytic or tantalum bead.
Because ordinary ohmmeters are calibrated to measure a range of resistance values that are significantly lower than the resistance of insulation. It should also be realised that we usually test insulation resistance while subjecting the insulation to a high electric field, which a normal ohmmeter is incapable of producing.
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When determining an electric field must a positive test charge be used or would a negative one do as well?
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