Table 6 Test results of 10th-order total harmonic distortion of customized signal (256 points)
Fundamental frequency (Hz) | Peak to peak (mVpp) | Custom distortion (%) | FFT harmonic analysis method (%) | Error (%) | Digital quadrature detection method (%) | Error (%) | Method error comparison (%) |
|---|---|---|---|---|---|---|---|
150 | 2688 | 10.10 | 10.09 | 0.09 | 10.11 | 0.05 | − 0.04 |
350 | 2432 | 35.75 | 36.02 | 0.76 | 36.06 | 0.87 | 0.11 |
750 | 2377 | 23.33 | 23.03 | 1.29 | 23.56 | 0.96 | − 0.33 |
1150 | 1662 | 38.26 | 37.73 | 1.39 | 38.85 | 1.54 | 0.15 |
1550 | 2688 | 14.03 | 13.84 | 1.36 | 14.20 | 1.16 | − 0.20 |
1950 | 2759 | 17.46 | 17.72 | 1.47 | 17.71 | 1.43 | − 0.04 |