| for a non-linear element with a sinusoidal input variable in steady state of the output variable the frequency response obtained by taking only the fundamental component of the output variable Note 1 to entry: The describing function may depend on the angular frequency and on the amplitude of the input variable, or only on the amplitude of the input variable. Note 2 to entry: This entry was numbered 351-24-42 in IEC 60050-351:2006.
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