Suggested Scheme: Use Twisted Pair - Fluke BT5300 Series User Manual

BT5300 Series
User Manual

Suggested Scheme: Use Twisted Pair

To reduce the error due to the eddy current, we recommended to use twisted pair for SOURCE and
SENSE, respectively, as shown in
generated by the current of the SOURCE wires cancels each other, and the induced voltage
generated by the SENSE wires in the alternating magnetic field also cancels each other, minimizing
the electromagnetic induction from SOURCE to SENSE.
However, at the position close to the battery, it is inevitable that a loop area is surrounded by the
SOURCE and SENSE wire respectively, and the overlapping area of loops has obvious
electromagnetic induction. If there are conductors near this area, eddy currents will be easily
generated and errors will be introduced, as shown in
136
Twisted pair segments:
magnetic fields generated by currents
cancel out each other
Figure 53. Schematic diagram of twisted pair test
Figure 53. In the twisted pair segment, the magnetic field
Nearby metal
where Sense and Source overlap
Figure 54. Effect of eddy current on ACR measurement
Loop areas:
magnetic fields are generated by currents
Figure 54.
Loop area
Cell