Whistler XP800i Owner's Manual page 18

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OPERATING PRINCIPLES
Consequently, these meters will not read the RMS modified sine
wave voltage correctly and, when measuring your Whistler inverter
output, the meters will read about 20 to 30 volts too low. To
accurately measure the output voltage of your inverter, use a true
RMS reading voltmeter such as a Fluke 87, Fluke 8060A, Beckman
4410, Triplett 4200 or any multimeter identified as "True RMS."
For more information on inverters see our Inverter FAQ page at
www.whistlergroup.com
A true sine wave typical of home AC outlet.
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