This audit protocol guides technicians through loop resistance measurement for electrical systems. It covers recording initial control unit settings, identifying and disabling auto control units, isolating 240V power, isolating DC negative outputs, installing a current clamp meter, connecting a DC voltmeter to the bridge rectifier, powering on and recording voltage and current at set intervals, increasing DC output to capture readings, restoring transformer taps and original settings, and verifying results. The process concludes with plotting measurements and calculating loop resistance to confirm compliance and equipment performance.
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