1. The meggar tester /or insulation
tester actually uses a high voltage at its terminals to do the measurements
thus being more efficient in driving In a current and then the measurements are
made. Multimeter as the name says is used for a variety of measurements but
using basically the same moving coil.when a high resistance or very small
leakage is to be tested using a multimeter it usually fails because of its in
ability to drive a current through a very high resistance circuit and give a
correct reading.
2. With a megger tester,a voltage of not less
than 500 volts DC is used for testing the insulation resistance of
windings.With a multi-tester, the voltage used is not more than 3-volts DC. A
megger is specifically designed to accurately measure high impedances. An
ordinary multi-meter is designed to measure lower, more finite impedances. A
megger is therefore more accurate for the application.
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