Whistler PRO-200W User Manual download pdf (Page 10)

OPERATING PRINCIPLES

The majority of AC voltmeters measure 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 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.

A true sine wave typical of home AC outlet.

For You Technical Types.

1. Basic Operating Principles:

WHISTLER inverters work 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 operate difficult reactive loads.

The output waveform resulting from these conversions is a

"quasi-sine wave" or a "modified sine wave" as shown on

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 Inverter

The modified sine wave produced by your Whistler inverter

has a root mean square (RMS) voltage of 110 volts.

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Whistler PRO-200W User Manual Page 10