Difference between megger and earth tester?

Friday, July 24, 2009

Interview Question: Difference between megger and earth tester?

Answer: 

Megger is an instrument which in addition to measurement of high resistance can be used to test the quality of the insulation at or above its operating voltage. whereas earth tester is used to measure low earth resistance.

Megger is used for measuring an insulation resistance of motor winding of cable etc. which is measured in megaohm. While earth tester has earth electrodes which are used to measure eathpit resistance & it is measured in ohm.

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