When testing capacitors, how is an ohmmeter used?
What will be an ideal response?
To accurately test a capacitor, two measurements must be made. One is to measure the capacitance value of the capacitor to determine whether it is the same or approximately the same as the rate value. The other is to test the strength of the dielectric. The first test should be made with an ohmmeter. With the power disconnected, connect the terminals of an ohmmeter directly across the capacitor terminals. (It is a good practice to discharge the capacitor, by touching the leads together, before connecting to the ohmmeter.) This test determines whether the dielectric is shorted. When the ohmmeter is connected, the needle should swing up-scale and return to infinity. The amount of needle swing is determined by the capacitance of the capacitor. Then reverse the ohmmeter connection; the needle should move twice as far up-scale and return to the infinity setting.
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What will be an ideal response?
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