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3.2 Measurement Details
The used Hall sensors contain a very small active semiconductor area ranging at
approx.100 µm. The local resolution of this mesasuring method is thus rather high.
Also notice that single Hall sensors measure one field component only.
3.2.1 Sample Measurements with an NdFeB Magnet
Due to the high local resolution, the near-surface measurement with magnets may
lead to misinterpretations because of the large field-strength gradients.
Figure 3 shows an NdFeB magnet with a material remanence of 1400 mT. In this
example the magnetic disk has a thickness of 5 mm with a diameter of 20 mm. The
magnet is supposed to be measured in 1 mm distance from the surface.
Page 14 / 106
Gaussmeter IGM11 Operating Instructions
Figure 3 Flux Line Characteristics of an NdFeB Induction Disk
Chapter 3 Function of the Gaussmeter
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