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2 hours ago - 8 hours ago -cle of your instrument transformers. Operation. Instrument transformer life cycle. Testing and corrective measures. > During the production process. Determine TEST ANDCALIBRATION PROCEDURE Except for test purposes, this unit Transformer T2 supplies AC voltage for the auxiliary power supply on the A100 May 12, 2017 - Perform a turn's ratio test on all tap positions if possible. Testing the ratio of a PT is a simple test and only requires a variac and a voltmeter. Use the following procedure for PT ratio Testing: a. Connect the variac across the primary winding. PURPOSE AND SCOPE. The purpose of this Standard Work Practice (SWP) is to provide guidelines for testing methods for Capacitive and Inductive. Voltage