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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.
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How test resistances?
we can measure the resistance if we know the voltage and current passing through a line (V=IR)AnswerYou can measure its approximate resistance using an ohmmeter, but ohmmeters aren't particularly accurate. A better way would be to use a Wheatstone Bridge, which is highly accurate.
How capacitors are tested?
first you need a analog multimeter. put in your meter in the ohm section x10. then remove the cap in the ckt and discharge that. then connect the multimeter -ve probe to the cap +ve terminal and connect the other terminals.the needle comes to low value then com to infinity, remove the probs then connect multimeters -ve prob to the cap -ve terminal that time look carefully the meter's needle comes to the one value and go back to the infinity that the low value is capacitors equivalent resistance value. the cap is 1000uf the equivalent resistance value is around 15 at x10 .the cap is 100uf the equivalent resistance value is around 15 at x100
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How test resistances?
we can measure the resistance if we know the voltage and current passing through a line (V=IR)AnswerYou can measure its approximate resistance using an ohmmeter, but ohmmeters aren't particularly accurate. A better way would be to use a Wheatstone Bridge, which is highly accurate.
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