RMS means Root of the Means Squared. It is primarily used in the measurement of non sinusoidal waveforms where the effective value is the norm for pure sinusoidal waves. Both are intended to measure the equivalent heating effect of straight DC so that you have a comparison heating effect.
So an RMS meter takes a sampling of the instantaneous voltages and squares them, adds them together and then takes the square root of the product. Reason for this is that energy responds to the square of the voltage so if you square a large number vs a small number (voltage amplitude) you will have a much larger number but since it isn't continuous, it has to be combined with the other amplitudes.
At least that's the way I remember it and it has been awhile.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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