Gaussmeter IGM11 Operating Instructions
Chapter 3 Function of the Gaussmeter
Page 12 / 106
MAGSYS
magne t
systeme
Version 01/2013
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me GmbH - All Rights Reserved.
This implies:
B
t
e
n
I
U
e
Hall
⋅
⋅
⋅
=
1
with
e
n
Charge carriers
e
Elementary charge of the electron (1.6022
×
10
-19
As)
w
Width of the path on which the electrons move
t
Effective force of the Hall element
B
Flux density in [Tesla]
This represents the idealized Hall effect.
In reality, the results deviate from this idealized effect.
Since there is a linear equation between the current and the measuring result, it
follows:
B
S
B
t
e
n
R
e
Hall
⋅
=
⋅
⋅
⋅
=
0
1
3.1.2
Non-linear Properties of the Hall Probe
In contrast to the idealized description, you find a non-linear behavior:
(
)
offset
HALL
Hall
R
B
B
S
R
+
⋅
+
⋅
⋅
=
2
0
1
α
For the used Hall sensor the real description is true for flux densities up to about
5000 mT.
3.1.2.1
Reasons for the Occurrence of R
offset
The strongest deviation from the idealized Hall effect is the occurance of an offset
voltage without a magnetic field. This effect is mainly caused by geometric
asymmetries of the Hall element.
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