Recommendations

AN3306

18/21

Doc ID 18182 Rev 1

8

Recommendations

Because the current sensor is wound on a dielectric support, the positioning of the spires

with respect to the cable has a relevant impact on performance in terms accuracy. Placing

the spires of the sensor in an axial position with the cable in the middle, as shown in

Figure 8, produces a higher sensitivity. Additional tests were conducted for current sensor 1,

placing it in a diagonal position with respect to the current cable.

Figure 10.

Cable in a diagonal position

The results are shown in column 4 of Table 6, and are compared to the accuracy error of the

same sensor with the cable in an axial position (column 3).

Table 6.

Accuracy results vs. current comparison between axial and diagonal

position

I [A]

Error % - axial

Error % - diagonal

10

100%

0.0000%

0.0000%

1

10%

-0.0640%

-0.0409%

0.5

5%

-0.0040%

-0.0214%

0.1

1%

-0.8436%

-1.0730%