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6. Operation
6.4.2
Measuring Arrangement
The outlet flux density of a bar magnet may be measured by plain lay a
transverse probe (as seen right in the image) or by orthogonal place an axial
probe (as seen left in the image) on the magnet.
Reversing the transverse probe does not produce the same value because
the active area of the hall element is not exactly in the center of the probe.
According to the states about polarity of the measured value (see section
6.4.1 Polarity) the axial probe shown in the image would produce a positive
measured value. If the cross of the transverse probe in the image points to
the magnet, this probe also would produce a measured value with positive
sign.
The field within a cylindrical coil is measurable with an axial probe. If a probe
is feed into the coil the lines of field are along the probe axis. For the axial
probe that is also the measuring direction. At the transverse probe the lines
of field would be perpendicular to the measuring direction so no useable
measuring signal may be generated. Like at the bar magnet with both probe
types the outlet flux density may be measured.
Here too the polarity (see section 6.4.1 Polarity) of the axial probe shown in
the image will produce a positive measured value. If the cross of the
transverse probe in the image points to the coil, this probe also would
produce a measured value with positive sign.
Projekt Elektronik
MESS - UND REGELUNGSTECHNIK GMBH
Figure 40 Measuring arrangement bar magnet
Page 61
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