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True RMS
A reader writes: If you had to
explain in layman's terms what True RMS is and how it relates to a voltage
meter, how would you do that? Somebody asked me, and I could not get my
words out. He wanted to know what true RMS means and why a true RMS meter is better
than an regular voltage meter.
Answer:
In
simple terms, an average reading meter (as opposed to a true RMS meter) will
give you inaccurate readings for anything other than a pure sine wave. When the
waveform gets distorted due to dimming, switch-mode power supplies (LEDs, audio
and lighting consoles, amplifiers, etc), or any other non-linear load, then an
average reading meter does not work properly due to the built in scaling
factor. A true RMS meter samples the waveform several thousand times per second
and calculates the RMS value, so it is accurate regardless of the shape of the
waveform.
To learn more about RMS values, true RMS reading meters and more, check out the Entertainment Electricity Training seminar schedule.
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Nashville - Electricity, Power Distro, & Controls
Entertainment
Electricity, Power Distribution, and Controls - Sept 1-3, Nashville, TN:
This is a three-day course that covers the concepts of electrical theory, power
distribution, and networking. This seminar is an excellent review for the
practicing entertainment electrician as well as a primer for the aspiring
electrician. It has enough detail and information to challenge the experienced
among us but presented in such a way as to convey useful concepts to the less experienced
with a minimum amount of math and complexity. Entertainment Electricity, Power Distribution, and Controls  |
Event Info Sep/1-3/2010 9-5 www.productionseminars.webs.com |
Beginning Electricity, Power Distribution, and Control Training - Texas State University San Marcus
Three-day course designed for beginners and intermediate students and professionals. It covers the concepts of electrical theory, power distribution, and networking. January 10-12, 2011
For more information click here.
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