thd and TDD

Your meter can be configured to provide thd (total harmonic distortion using the total RMS value for the content rather than the fundamental content) and TDD (total demand distortion, the harmonic current distortion against the maximum demand of the electrical system).

thd = HC / RMS *100%

TDD = HC / DemandMax *100%

See the ION Reference, available from www.se.com, for details about the Harmonics Measurement module.

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