| ratio of the r.m.s. value of the total distortion content to the r.m.s. value of the fundamental component or the reference fundamental component of an alternating quantity
NOTE 1 – The total distortion ratio depends on the choice of the fundamental component. If it is not clear from the context which one is used an indication should be given.
NOTE 2 – The total distortion ratio may be approximated to a certain harmonic order. This is to be stated.
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