Puresine vs Modified Sine Volt Meters

The inverter in the Nucleus Power Dock and the 1000w Xantrax carts have a modified sine wave output. Modified sine wave voltage is a type of square wave that has an RMS (Root Mean Square) value of 120 VAC in this inverter.

A general-purpose AC voltmeter is calibrated to accurately measure the RMS value of a Pure Sine Wave and NOT of a Modified Sine Wave.

If this general-purpose voltmeter is used to measure Modified Sine Wave voltage, it will indicate a lower value (96 VAC to 108 VAC).

For accurately measuring the voltage of a Modified Sine Wave, use a voltmeter which is designed to measure  True RMS Values  such as the Fluke 87, Fluke 8060A, Fluke 77 / 99, Beckman 4410 etc.