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Megohmmeters, sometimes referred to as insulation testers, megger testers or ohm resistance tester are used to determine the condition of the insulation on wire and motor windings.
In the past, people use hand crank insulation tester. In this modern time, battery insulated is widely used in the market. As the voltage increases in external circuit the deflection of pointer increases and deflection of pointer decreases with an increase of current.
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