Neilsen CAR2K, Instruction Manual, Page: 12 / 24

8. THE INVERTER’S OUTPUT WAVEFORM
The AC output waveform of the CAR series inverter is known as “modified sine
wave”
Modified sine wave and pure sine wave comparison
The modified sine wave has an RMS (Root mean square) voltage of 220-240
volts, which is the same as standard household power. Most AC voltmeters (both
digital and analog) are sensitive to the average value of the waveform rather than
the RMS value. They are calibrated for RMS voltage under the assumption that
the waveform measured will be a pure sine wave. These meters will not read the
RMS voltage of a modified sine wave correctly. They will read about 20 to 30
volts low when measuring the output of the inverter. For accurate measurement
of the output voltage of this unit, use a true RMS reading voltmeter such as Fluke
87III, Fluke 8060A, Fluke 77/99 series or Beckman 4410.
Interference With Some Equipment
. Buzz in Audio Equipment
Some inexpensive stereo systems may emit a buzzing noise from their
loudspeakers when operated from the inverter. This occurs because the power
supply in the audio
System does not adequately filter the modified sine wave produced by the
inverter.
The only solution is to use a sound system that has a high quality power supply.
.Television Reception
When the inverter is operating, it can interfere with television reception on some
channels. If interference occurs, try the following: