How To Use Digital Megohmmeter?

       Digital megohmmeters are commonly used and indispensable instruments in power, post and telecommunications, communications, electromechanical installation and maintenance, and industrial enterprises that use electricity as industrial power or energy. It is suitable for measuring the resistance value of various insulating materials and the insulation resistance of transformers, motors, cables and other electrical equipments.

The method of operation is as follows:

1. Disconnect all power to the conductor or circuit under test. When performing these high voltage tests, no voltage can be connected to the circuit.

2. Unload all wires to be tested. This means that any wires whose insulation value is to be checked must be completely disconnected at both ends of the circuit. The bare copper ends are sometimes covered with wire nuts or tape. This can protect the equipment or other people from electric shock. In the case of testing the motor, you must also completely disconnect all wires that supply power to the motor.

3. Connect one wire of the digital megohmmeter to the electrical frame or ground of the electrical system. When testing the motor windings, this lead will be connected to the actual metal frame of the motor.

4. Connect the other wire of the meter to the bare copper end of the wire or one of the motor terminals. Check to make sure that the other end of the wire under test is in free air or covered with insulating material.

5. Turn on the meter or start shaking the generator handle. High voltage may take 2 to 5 seconds to form inside the wires or motor windings.

6. Read the meter. Readings greater than 999 megohms are nearly perfect resistance readings for wires or new motors. Resistance readings less than 1.5 megohms may cause problems in old wires or old motors. In most cases, unless there is a problem with these circuits, any reading between these values is OK.

7. Continue to test other wires or the remaining motor terminals. Once the high voltage source of the instrument stops, the wires or motor wires can be used safely.

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