Megger MPU690 Proving UnitMPU690 Two Pole Tester Proving Unit 5 stepped nominal output voltages Automatic operation High output power suitable for test lamps Extended battery life Magnetic base Rugged case The MPU690 proving unit provides a portable battery operated voltage source that can verify the correct functioning of two pole voltage detectors. The device safely generates a range of voltages from 50 to 690 V in five steps. At switch on, the unit initially generates 690 V
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