AN3306

Recommendations

Doc ID 18182 Rev 1

19/21

Figure 11.

Accuracy results vs. current comparison between axial and diagonal

position

As illustrated in the graph above, changing the cable orientation from an axial to a non-axial

position increases the transfer sensitivity, especially when the cable contacts the sensor

body.

Moving the cable within the center-passing hole does not result in an appreciable lack of

performance.

Attention should also be given to proper shielding, which can prevent errors on the

measured current resulting from the high potential of the cable coupling with the sensor. It

must be connected to ground.

Connecting the shield wire of the sensor (the white wire, if using the PA2999.006NL sensor)

to the active signal input (hot), rather than a GND-referred input increases the error at low

currents, and could cause external noise, further affecting accuracy.

The accuracy tests were also conducted with the shield connected to hot. However, even

with this erroneous positioning, the lack of accuracy was very small and the error still far

below Class 1 requirements.

-2,0%

-1,0%

0,0%

1,0%

2,0%

1%

10%

100%

% of In

Axial position

Diagonal position

Class 1 limits

Class 0.5 limits