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Understanding RMS Measurements

Category: PQ Theory, PMI Products, Power Quality, Guardian

Read this white paper to understand the best method for measuring voltage and current in an AC system.

 

This paper discusses how to take instantaneous readings for a voltage or current waveform and convert them to their Root Mean Square (RMS) value. It also explains how to analyze a single-cycle of the waveform in both the time and frequency domains.

 

Plus, we take a look at the decomposition of the voltage waveform into its individual harmonic frequency components in order to get an understanding of where the instantaneous voltage value comes from.

 

Finally, using Parseval’s Theorem, we are able to convert the frequency domain values produced by the waveform capture of a Variable Frequency Drive (VFD) to calculate the IRMS of the complex waveform, showing that the RMS value encompasses all harmonic information.

 

This White Paper Includes:

  • What is Root Mean Square (RMS)?
  • Why Use RMS?
  • RMS vs. Peak Values
  • RMS and Harmonics

Download White Paper Here