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WHISTLER PP500AC
For You Technical Types.
I. Basic Operating Principles.
The WHISTLER 500 works in two stages. During the first stage, the
DC to DC converter increases the DC input voltage from the power
source (e.g a 12 volt battery) to 145 volts DC. In the second stage,
the high voltage DC is converted to 110 volts (60 Hz AC) using
advanced power MOSFET transistors in a full bridge configuration.
The result is excellent overload capability and the capacity to oper-
ate difficult reactive loads. The output waveform resulting from these
conversions is a "quasi-sine wave" or a "modified sine wave" as
shown below.
This stepped waveform is similar to the power generated by utilities
and has a broad range of applications.
The modified sine wave produced by the WHISTLER 500 has a root
mean square (RMS) voltage of 110 volts. The majority of AC voltme-
ters are calibrated for RMS voltage and assume that the measured
waveform will be a pure sine wave.
Consequently, these meters will not read the RMS modified sine
wave voltage correctly and, when measuring the WHISTLER 500
output, the meters will read about 20 to 30 volts too low. To accu-
rately measure the output voltage of the WHISTLER 500, use a true
RMS reading voltmeter such as a Fluke 87, Fluke 8060A, Beckman
4410, Triplett 4200 or any multimeter identified as "True RMS."
WHISTLER PP500AC Inverter Modified Sine Wave
145 vOlts pesk
115 volts AMS
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