Variable Speed Drive Characterization: Review of Measurement Techniques and Future Trends

Table 9

(a) Accuracy ± (% reading + % range) for 𝑉 and 𝐼. (b) Accuracy ± (% of reading) for 𝑃.

(a)  

Frequency [Hz]	Voltage	Current
0–15	±(0.15 + 0.03)	±(0.15 + 0.05)
15–45	±(0.15 + 0.01)	±(0.15 + 0.03)
45–1000	±(0.04 + 0.01)	±(0.04 + 0.02)
1 k–400 k	±[(0.04 + 0.0045/kHz) + (0.01 + 0.003/kHz)]	±[(0.04 + 0.0045/kHz) + (0.02 + 0.0045/kHz)]
400 k–1 M	typ.: −0.5% of rdg./100 kHz	2% of rdg/100 kHz

(b)  

Frequency	Power factor (cosΦ)
	1	0.5	0.1
1 Hz	0.296	0.296	0.313
50 Hz	0.089	0.091	0.138
1 kHz	0.089	0.097	0.238
10 kHz	0.211	0.31	1.32
100 kHz	1.32	2.5	—
400 kHz	5.04	—	—
	Power factor (cosΦ)
	0.1	0.01	0.001
50 Hz	0.1	0.472	4.64
	Power input (% of range)
	100%	50%	10%
50 Hz	0.089	0.097	0.175