AG003-01E NVE, AG003-01E Datasheet - Page 111
![ASSEMBLY CURRENT SENSOR EVAL](/photos/9/20/92012/ag003-01e_sml.jpg)
AG003-01E
Manufacturer Part Number
AG003-01E
Description
ASSEMBLY CURRENT SENSOR EVAL
Manufacturer
NVE
Specifications of AG003-01E
Sensor Type
Magnetic. GMR (Giant Magnetoresistive)
Interface
Analog
Embedded
No
Utilized Ic / Part
AA Series Current Sensors
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Supply
-
Sensitivity
-
Sensing Range
-
Other names
391-1060
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For example, tolerances on the placement of the magnet relative to the sensor are not perfect, and any
slight variation in the placement of the magnet can lead to offset problems; see the drawing below:
Generally the magnet is glued in place; this can lead to tilting of the magnet with respect to the sensor,
introducing more variations in the field at the sensor, and more offset problems, as well as potential
glue joint problems. Furthermore, the composition of most inexpensive magnets is not particularly
uniform, and many have cracks or other mechanical imperfections on the surface or internally that lead
to a non-uniform field. Most permanent magnets have a temperature coefficient, and some can lose up
to 50% of their room temperature strength at 125°C. The following drawing shows the effects of
temperature added onto an imperfect bias. The offset of the sensor varies with temperature as shown:
Finally, as the airgap changes, the magnetic field at the sensor also changes. So, the magnetic field at
the sensor will vary from one installation to the next, and if the gear has runout, wobble, or expands
with temperature, the output signal and offset of the sensor element will vary.
GMR Senso r
Resistors R3, R4
GMR Senso r
Resistors R3, R4
www.nve.com
Direction of Sensitivity
Direction of Sensitivity
Magnet
Magnet
phone: 952-829-9217 fax: 952-829-9189
- 111 -
GMR Senso r
Resistors R1, R2
GMR Senso r
Resistors R1, R2
25C
125 C
Application Notes
Voltage Output of
GMR Bridge
Voltage Output of
GMR Bridge
Offset Induced by
A symmetry of Magnet
and Sensor Elements
25C
Rotation
125 C
Rotation
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