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KMY/KMZ Linear Magnetic Field Sensors
DESCRIPTION
An uniaxial linear magnetic field (in y-direction) will generate a linear output within the specified magnetic
field range. The sensor is available in two types: the KMY 20 M, KMY 21 M and KMZ 20 M sensor types
contain intrinsic magnets which provide an auxiliary magnetic field (in x-direction) at the sensor die which
prevents magnetic domains from flipping irregularly.
Auxiliary Field Dependence
If the dies MR174B or the
components KMY22, KMY20S
15
or
KMZ20S
are used, the
auxiliary field has to be provided
by the user. The dependence of
the sensitivity with auxiliary field
10
strength is depicted in the figure
aside.
5
0
0
1
2
3
4
5
Figure 1 : Sensitivity dependence on
auxiliary field strength
Hx in kA/m
Auxiliary field strengths below Hx<1.5 kA/m are not recommended, as small disturbances may flip the
magnetization domains. Sometimes, the magnetic conditions in the application may provide enough Hx bias
field stabilization. MEAS Germany can provide advise for customer specific magnet arrangements.
If a bias field Hx is not applied
or Hx is less than 2.5 kA/m, the
sensor may be used only in a
limited field range Hy,
depending on the present total
bias field Hx,tot. In this case, it
is strongly recommended to
‘premagnetize’ the sensor, i.e.
align all magnetic domains
consistently, prior to the
measurement.
Hx,tot is the sum of all acting
magnetic fields in x direction at
the sensor die.
Do not use the sensor outside
the safe operating
area.
Leaving the save operating area
can destroy an existing
premagnetization and therefore
will lead to unreproducible
sensor signals.
Figure 2 : Safe operating area
KMY/KMZ Rev 4
www.meas-spec.com
2/9
2012-December
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