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When checked with an ohmmeter, a properly functioning capacitor should initially show a low resistance as the capacitor charges, but then the resistance should increase rapidly to a very high value or infinity as it becomes fully charged. This behavior indicates that the capacitor is not shorted and is capable of holding a charge. If the ohmmeter indicates a constant low resistance, the capacitor may be faulty or shorted. Conversely, if it shows an infinite resistance immediately, the capacitor might be open or defective.

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3d ago

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If an open capacitor is checked with an ohmmeter the needle will?

. . be visible.


How do you check a capacitor to see if it is good or bad?

There are many ways. FIRST: short the terminals to ensure it is not charged. Many of the digital meters today also have a capacitance check setting, simply use that setting. It not only checks for faults, but also will give you a reading of the capacitance value itself. For most non-electrolytic capacitors a quick check (definately bad vs. maybe good) can be done with an analog VOM. Use the highest resistance scale to measure across the terminals. When first connected there should be a short needle jump that slowly drops back to infinity. Reverse the leads and do it again, should have the same effect. Any resistance highter than infinity indicates a shorted capacitor. Lack of needle jump may indicate an open capacitor (or one of very little capacitance). Electrolytics can also be checked with a VOM, but polarity must be observed, and the drop back to infinity may take a very long time. Alternatively, for electrolytics and larger capacitors is to charge them with a low voltage source (e.g. 9V battery) and measure with multimeter to see if they hold the charge.


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