AVTMMTO3XX Rev 3 Sept 2013
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Getting to know the MTO
Product Overview 300/330
The Megger Transformer Ohmmeter is a line-operated, field-portable instrument
designed specifically to measure the DC resistance of all types of magnetic
windings safely and accurately.
Its predominant use is the measurement of the DC resistance of all types of
transformer windings within the defined range of resistance. It can also test
rotating machine windings and perform low resistance measurements on
connections, contacts and control circuits.
It is recommended that the user becomes familiar with the MTO before making
any connection to a transformer.
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