By providing in-field substitute voltage source, battery-operated MPU690 helps ensure that 2-pole voltage tester is capable of detecting voltage safely and efficiently. Portable device generates stepped voltages beginning at 690 V and slowly ramps down until device shuts off, indicating that 2-pole voltage tester can correctly indicate voltages at different levels. Facilitating operation, proving unit automatically turns on when voltage test prods are inserted into its output terminals.
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