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. 2020 Nov 7;20(21):6361. doi: 10.3390/s20216361

Table 13.

FFT results. Distorted voltage signal with 25 harmonics, f1 = 57.5 Hz.

Harm f_gen V_gen V_gen f_FFT E V_FFT Em En Class I Class II Class
(Hz) (V) (%) (Hz) (mHz) (V) (%) (%) Limits Limits Limits
1 57.5 230 100% 57.4977 2.3 229.31 0.30% 0.300% True True I
2 115 4.6 2.0% 114.9954 4.6 4.585 0.32% 0.006% True True I
3 172.5 11.5 5.0% 172.4931 6.9 11.454 0.40% 0.020% True True I
4 230 2.3 1.0% 229.9908 9.2 2.288 0.52% 0.005% True True I
5 287.5 13.8 6.0% 287.489 12 13.69 0.81% 0.049% True True I
6 345 1.15 0.5% 344.986 14 1.139 0.93% 0.005% True True I
7 402.5 11.5 5.0% 402.484 16 11.36 1.2% 0.062% True True I
8 460 1.15 0.5% 459.982 18 1.132 1.6% 0.008% True True I
9 517.5 3.45 1.5% 517.479 21 3.384 1.9% 0.029% True True I
10 575 1.15 0.5% 574.977 23 1.124 2.2% 0.011% True True I
11 632.5 8.05 3.5% 632.475 25 7.84 2.6% 0.091% True True I
12 690 1.15 0.5% 689.972 28 1.116 3.0% 0.015% True True I
13 747.5 6.9 3.0% 747.470 30 6.66 3.4% 0.10% True True I
14 805 1.15 0.5% 804.968 32 1.10 4.1% 0.021% True True I
15 862.5 1.15 0.5% 862.466 35 1.09 5.2% 0.026% True True I
16 920 1.15 0.5% 919.963 37 1.09 5.1% 0.025% True True I
17 977.5 4.6 2.0% 977.461 39 4.34 5.7% 0.11% False True II
18 1035 1.15 0.5% 1034.959 41 1.07 6.5% 0.032% True True I
19 1093 3.45 1.5% 1092.456 44 3.21 6.9% 0.10% False True II
20 1150 1.15 0.5% 1149.954 46 1.06 7.8% 0.039% True True I
21 1208 1.15 0.5% 1207.452 48 1.05 9.0% 0.045% True True I
22 1265 1.15 0.5% 1264.949 51 1.04 9.3% 0.046% True True I
23 1323 3.45 1.5% 1322.447 53 3.10 10% 0.15% False True II
24 1380 1.15 0.5% 1379.945 55 1.03 10% 0.053% True True I
25 1438 3.45 1.5% 1437.443 58 3.05 11% 0.17% False True II