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
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
... [Read Article]
Latest Ad:
Oliver 550 Diesel runs like a watch three point hitch pto engine gone threw about two hundred hours ago nice clean tractor
[More Ads]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
