Wagan Tech 2003-5 Guide D'utilisation page 4

Smart AC 400W USB+ by Wagan Tech
™ ™
MEASURING THE AC VOLTAGE
This inverter's AC output is a modified sine wave (MSW) at 115 volts AC.
The figure below compares a modified sine wave to a pure sine wave.
Modified Sine Wave (MSW)
This modified sine wave has a root mean square (RMS) voltage of 115 volts.
Most ordinary AC voltmeters are calibrated to read "average" voltage and
assume that the AC waveform will be a pure sine wave. These meters will
not correctly read MSW voltage, and will display about 20 to 30 volts too
low. Any multi-meter identified as "TRUE RMS" will accurately read MSW
correctly.
ADDING AN EXTENSION CORD
Using an extension cord will reduce power output. However, if you need an
extension cord, we recommend placing the extension cord between the AC
output of the inverter and the AC appliances. You may use up to 100 feet of
high quality extension cord.
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Pure Sine Wave
User's Manual—Read before using this equipment
MAINTENANCE
Very little maintenance is required to keep the inverter operating properly.
Simply keep it clean.
TROUBLESHOOTING
Inverter Beeping
If the power inverter makes a beeping sound, turn off the power inverter,
disconnect all appliances from inverter and disconnect the inverter from the
power supply. The beeping sound is the low battery warning indicating that
the voltage of the battery power supply is getting low. Restart the vehicle
engine to charge the battery before using it to operate the power inverter
again.
Buzz in Audio Systems
Some stereo systems and boom boxes will emit a buzzing noise from their
loudspeakers when operating with a power inverter. The power supply in the
device does not adequately filter the modified sine wave produced by the
power inverter. The only solution is to use a sound system that incorporates a
higher quality power supply.
Operating a Television
Picture tubes have a degaussing coil that uses a high initial surge of power
to light up the screen from a "cold start." If the TV does not start up on
the first attempt, try switching the TV on and off consecutively every 2 to 3
seconds (it may take 2 to 5 tries before starting).
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