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© 2006 Directed Electronics - all rights reserved
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The AC output waveform of the Inverter is called a "quasi-sine wave"
or a "modified sine wave". It is a stepped waveform that is designed
to have characteristics similar to the sine wave shape of utility power.
A waveform of this type is suitable for a wide variety of applications.
The modified sine wave produced by the Inverter is designed to have
a RMS (root mean square) voltage of 115 volts, the same as standard
household power. Most AC voltmeters (both digital and analog) are
sensitive to the average value of the waveform rather than the RMS
value. They are calibrated for RMS voltage under the assumption that
the waveform measured will be a pure sine wave. These meters will not
read the RMS voltage of a modified sine wave correctly. They will read
about 20 to 30 volts low when measuring the output of the Inverter.
For accurate measurement of the output voltage of the Inverter, a true
RMS reading voltmeter such as a Fluke 87, Fluke 8060A, Beckman
4410, or Triplett 4200 must be used.