13
Output Waveform
a) The AC output waveform of the inverter is known as
"modified sine wave." The waveform is similar to the sine
wave shape of utility power. This type of waveform is suitable
for most AC loads, including linear and switching power
supplies used in electronic equipment, transformers,
and motors.
b) The modified sine wave produced by the inverter has an RMS
(root mean square) voltage of 115 volts, which is 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 this unit, use a true RMS reading voltmeter such as
a Fluke 179, Fluke 79 III series, Beckman 4410 or Triplett 4200.
Modified Sine Wave and Sine Wave Comparison
SINE WAVE
MODIFIED
SINE WAVE
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