Universal meters are common tools for measuring and diagnosing faults in circuits and electrical components. The following describes how to diagnose the damage of the motor bearing. First turn the multimeter switch to Ω, the range is kΩ. Then, a test lead is attached to the motor casing to be tested, and the other test head is preferably replaced with a copper rod to touch the end face of the rotating motor shaft to observe the reading. When the reading is above 2kΩ, the motor bearing is operating normally. When the reading is in the range of 400 to 2000 Ω, it indicates that the motor bearing is close to failure.
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