As a waveform can be described as a combination of sinusoids of different frequencies and magnitudes, the accuracy can be the sum of the frequency-dependent terms..

The calculation would be as follows: (%Reading + %Range + Fixed)*(Percent Contribution of Frequency 1) + (%Reading + %Range + Fixed)*(Percent Contribution of Frequency 2) + (%Reading + %Range + Fixed)*(Percent Contribution of Frequency 3) + … + (%Reading + %Range + Fixed)*(Percent Contribution of Frequency N), where N depends on the number of harmonics that were taken into account, realizing that the larger N is, the more precise the calculation will be for the accuracy on this non-sinusoidal signal.

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