| Definition: | ratio of the RMS value of the harmonic content of an alternating quantity to the RMS value of the quantity
Note 1 to entry: When a reference fundamental component is defined, the term "total harmonic factor" is sometimes restricted to harmonic components only (see IEV 551-20-15), and the term "total distortion factor" is used for the concept defined here (see IEV 551-20-16).
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