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February 05, 2011

Comments

Power Supply Designer

John,

Thanks for your practical application of RMS fundamentals. This will be a helpful tool to remember. I was not aware of the crest factor limitations of true RMS reading meters.

May I emphasize something that you briefly stated? There are two measurements required for this RMS calculation. The first is a measurement with an average reading multimeter, and the second is a measurement of duty cycle or Ton and Toff with the oscilloscope. With these two measurements, the RMS value of the waveform can be calculated according the equation relating RMS value to average value and duty cycle.

This technique also presumes that the period of the waveform is substantially shorter than the averaging time constant of the multimeter.

Thanks for your articles! I am learning a lot from them.

Robert W. Stowe
www.TruePowerResearch.com

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