True RMS reading voltmeters measure the waveform a great number of times during each ½ cycle and then perform a mathematical calculation on the collective readings to find the RMS value while the cheaper meters assume the waveform is a perfect sinewave and the RMS value is always 0.707 times the peak value of the sinewave,
Wave forms such as pulse width modulated waveforms that are created by pulsing a DC voltage on and off will not read accurately unless you are using a true RMS reading meter. Most of the cheaper inverters use some type of pulse technology so the cheap meter will not give a “true” reading.
If you google Fluke instruments and go to the technical publications area on their site you can find all you ever wanted to know about “True RMS”.
The older microwaves used a phase back technique where the circuitry was designed to use “Zero crossing” information of the sinewave to determine at what point in the phase to fire the magnetron, at lower heats the magnetron was fired latter in the cycle.
With an applied pulse width modulated waveform you have a number of Zero crossings and the on and off applied voltage will allow the thyristor that fires the magnetron to recover or turn off. When the thyristor has a sinewave applied, once it has turned on it will “latch on” until the applied waveform approaches “Zero Crossing” at the end of the waveforms cycle. So the magnetron will be on for less time during a cycle if feed with the pulsing voltage.
Don’t know anything about the new Microwave it would be interesting to find out the technology they are using
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Today's Featured Article - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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