Amplitude of a pure sinusoid

• If we were sure we had samples of a perfect sinusoid, we merely need to subtract the minimum sample from the maximum sample observed over any interval of 1/60th of a second
• That would be the Peak-to-Peak measurement of the sinusoid amplitude
• … but we don’t have a perfect sinusoid because of nonlinearities in the current transformer

• Some small sampled peak-to-peak measurement error exists regarding how high the sampling rate is and how close the highest sample is to the true sinusoidal peak … small as depicted with a 20 times sampling rate