Wagan Tech Smart AC 400W USB+ Guide D'utilisation page 7

5. Plug your appliances into the AC oulets or mobile electronics to the
USB power ports at the front of the inverter.
6. When you are not using the inverter, turn the power switch off and
disconnect the inverter from power supply.
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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User's Manual—Read before using this equipment
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Pure Sine Wave
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