FHS-40-P-SP600 Datasheet, PDF (11/18 Pages) LEM – Current transducer FHS 40-P/SP600

FHS 40-P/SP600
0 - 100A
Application information
Single track on PCB
The main pratical configurations will now be reviewed and their main features highlighted.
The use of Minisens to measure a current flowing in a track provides the following advanges:
●● Isolation is guaranteed by PCB design. If the primary track is placed on the opposite (bottom) side of the PCB,
the isolation can be very high
●● stable and reproducible sensitivity
●● inexpensive
●● large input currents (up to about 100 A).
1^B
Ip
PCB
B
B
PCB
Primary Conductor (Track)
PCB
Primary Conductor
(Track)
Figure 10: Principle of Minisens used to measure current in a PCB track
Sensitivity function of track to magnetic sensor distance
(track 70 microns thick)
120
1 mm wide track
2 mm wide track
3 mm wide track
100
80
100727/10
60
nominal distance for
40
a top side track
nominal distance for a
20
bottom side track with
1.6 mm PCB
0
1 1.235
1.5
2
2.5
2.905 3
3.5
track axis to sensor distance (mm)
Figure 11: Sensitivity versus track width and versus distance between the track and the Minisens sensing
elements
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
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