Table 2.

Ratio error for each accuracy class and for different range of frequencies.

Accuracy Class	Ratio Error $\mathit{\epsilon }$ [%]
	50 Hz	0.1 to 1 kHz	1 to 1.5 kHz	1.5 to 3 kHz
0.1	$\pm 0.1$	$\pm 1$	$\pm 2$	$\pm 5$
0.2	$\pm 0.2$	$\pm 2$	$\pm 4$	$\pm 5$
0.5	$\pm 0.5$	$\pm 5$	$\pm 10$	$\pm 10$
1	$\pm 1$	$\pm 10$	$\pm 20$	$\pm 20$