December 2, 2013 – Megger has designed a palm-sized, battery-operated proving unit that boasts a substitute voltage source for testing a two-pole tester. The MPU690 helps to ensure that a voltage tester is capable of detecting voltage safely and efficiently, describes Megger. 

The portable device is best suited for use where a live voltage testing source is not available or where maneuverability is limited, such as being up on a ladder or in a tight, confined space. For simplified operation, the unit automatically turns on when voltage test prods are inserted into the unit’s output terminals. The MPU690 generates stepped voltages beginning at 690V then gradually ramps down until the device shuts off, giving an indication that the two pole voltage tester can indicate voltages at different levels correctly. It has an operating temperature range of -10C to 40C.