A Nonlinear Calibration Method Based on Sinusoidal Excitation and DFT Transformation for High-Precision Power Analyzers

Table 4

1000 Hz current measurement comparison.

AC current (A) signal frequency 1000 Hz
Standard value	The old method			The proposed method
	Phase A	Phase B	Phase C	Phase A	Phase B	Phase C
0.10	0.10	0.10	0.10	0.10	0.10	0.10
0.50	0.49	0.50	0.49	0.49	0.49	0.49
1.00	0.99	0.99	0.99	0.99	0.99	0.98
5.00	5.01	4.97	5.00	4.98	4.97	4.99
10.00	10.11	9.88	9.86	9.99	9.98	10.01
25.00	24.72	24.68	25.18	24.92	24.94	24.91
40.00	38.62	39.28	38.46	39.79	40.08	39.89
55.00	51.78	51.65	51.71	54.24	54.31	54.29