Operating PRINCIPALS/SUMMARY

1250/1750/2750 Manual 3/6/02 2:45 PM Page 27

OPERATING PRINCIPALS

This stepped waveform is similar to the power generated by utilities and has a broad range of applications.

The modified sine wave produced by

your Whistler Inverter

The modified sine wave produced by your Whistler inverter has a root mean square (RMS) voltage of 110 volts. The majority of AC voltmeters are calibrated for 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 at www.whistlergroup.com/faq-inverters.asp

A true sine wave typical of home AC outlet.

In Review.

•Never attempt to operate your Whistler inverter from any power source other than a 12 volt battery or a group of batteries that total 12 volts.

•Always make certain that the power cable terminal connections run Negative (-) to Negative (-) and Positive (+) to Positive (+). Check these connections fre- quently to ensure that they are secure.

•Make certain the rated power consumption of the appli- ance or equipment you wish to operate is compatible with the capacity of your inverter.