MOTOR RESISTANCE For the winding resistance use an ohmmeter. When you say disconnected from the circuit, are the stated values taken from the motor leads in the junction box? Winding resistance is also used for measuring I2R losses in the winding. Resistance values will "drift" at first due to the inductance of the transformer, which is more prevalent in large, delta connected windings. For insulation testing, we need to disconnect from … A Micro-ohmmeter is used to measure low resistance circuits. The tester then provides a resistance reading. These instruments will enhance trouble-shooting efficiency, improve your electric motor maintenance program, and help avoid unplanned production outages.

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