
Application Notes
The following chart shows the output of an AA-Series sensor when it is exposed to a saturating
unipolar field:
- Applied Field
Voltage
Output
Output Follows This
Curve from Positive
Saturation Field Back
to Zero
Output Follows This
Curve from Zero to
Positive Saturation
Field
+ Applied Field
In the case of a unipolar field, the sensor is operating on the minor hysteresis loop. The hysteresis in
this case is relatively small.
The following chart shows the output of the same sensor when it is exposed to a saturating bipolar
field:
Output Follows This
Curve from Negative
Saturation Field Back
to Zero
Output Follows This
Curve from Positive
Saturation Field Back
to Zero
Voltage
Output
Output Follows This
Curve from Zero to
Output Follows This
Curve from Zero to
Negative Saturation
Field
- Applied Field
Positive Saturation
Field
+ Applied Field
In this case the sensor is operating on the major hysteresis loop, so the hysteresis shown by the output
characteristic of the sensor is relatively large. This is the worst-case hysteresis exhibited by the sensor
element.
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