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Answer Posted / vijaykumar shetye
A megameter, or a Megger as it is commonly called, is used
to measure the insulation resistance of cables and other
electrical equipment. The measured value is in mega ohms.
Hence the term Megger.
Most meggers generate 500 Volts DC supply, but their
current capacity remains low.
When the two terminals of a megameter is connected to
across the equipment to be tested, the high voltage gets
leaked into the equipment. The resistance is inversely
proportional to the current flowing through the equipment
under test.
Originally, most meggers were analog in nature, and were
generating high voltage using a dynamo, when the lever is
rotated at high speed.
Today most meggers available are digital, and can
generate 500 volts as well as 1000V. Some meggers have
winding resistance testing facility as well, and hence can
be used as a single tool to test the resistance of a motor
in ohms as well as in Megaohms.
Meggers used for checking high resistance like that of
mains transformrs, generate much higher voltages and are
generally analog type.
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