When checking a capacitor to see if it is shorted, open, or leaky, which ohm meter range should you use?

When checking a capacitor for shorts, opens, or leakage, selecting the highest range on the ohmmeter is the most suitable approach. This is primarily because capacitors can have high resistance values, particularly when they are functioning correctly. Using the highest range allows for a more accurate reading of the capacitor's resistance characteristics.

In this context, if a capacitor is in good working condition, it will ideally show an open circuit (very high resistance) with a gradual increase in resistance as it charges. Conversely, a shorted capacitor will display a low resistance reading, while a leaky capacitor will show a resistance value that is lower than expected but not necessarily zero.

Using a lower range might lead to inaccurate readings or even damage the meter if the capacitor is charged. The highest range provides a safeguard and allows the technician to observe the broader spectrum of potential resistance values that a capacitor may present. Thus, utilizing the highest ohm meter range ensures reliability in identifying the capacitor’s condition.