Whistler Marine Battery PRO-200W User Manual

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OPERATING PRINCIPLES
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.
pro200-400w.qxp 4/30/2010 9:07 AM Page 19

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