Table 7 Test results of 15th-order total harmonic distortion of customized signal
Fundamental frequency (Hz) | Peak to peak (mVpp) | Custom distortion (%) | FFT harmonic analysis method (%) | Error (%) | Digital quadrature detection method (%) | Error (%) | Method error comparison (%) |
|---|---|---|---|---|---|---|---|
150 | 2688 | 22.57 | 23.20 | 2.81 | 23.34 | 3.41 | 0.60 |
350 | 2432 | 58.68 | 60.62 | 3.32 | 60.65 | 3.36 | 0.04 |
750 | 2377 | 38.83 | 39.72 | 2.29 | 39.97 | 2.92 | 0.63 |
1150 | 1662 | 77.40 | 80.57 | 4.10 | 80.84 | 4.45 | 0.35 |
1550 | 2688 | 28.33 | 29.53 | 4.22 | 29.62 | 4.56 | 0.34 |
1950 | 2759 | 32.11 | 33.63 | 4.73 | 33.41 | 4.05 | − 0.68 |