参数资料
型号: 12217
厂商: NVE Corp/Sensor Products
文件页数: 122/145页
文件大小: 0K
描述: MAGNET 3.5MM DIA X 4MM THICK
标准包装: 10
系列: *
其它名称: Q7078272A
Application Notes
Note that although a permanent magnet was used for biasing in these experiments, a better method is to
use a constant current. The current can be run on a trace parallel to the trace to be sensed, and will add
to the current of interest. The magnetic field from the bias current can be more closely controlled than
the field from a permanent magnet, which varies substantially with distance from the sensor. In
addition, provided the bias current is stable over temperature, the bias field at the sensor element will
also be stable over temperature. Permanent magnets often have large temperature coefficients, leading
to biasing changes with temperature.
AA003-02 over single 0.010" wide
0.0023" thick trace
155
154.5
154
153.5
153
152.5
152
151.5
mV Out = -29.19 ± 0.08(A)
@8.06V
0
0.02
0.04
0.06
0.08
0.1
Current (A)
The sensor that was used to take this data was supplied with 8.06V. The marks on the graph are output
error bars that cover the expected error from this part due to the part’s intrinsic hysteresis and
measurement errors. The current was swept from zero to 100 mA and back to zero multiple times. In
this biased state, the sensor is extremely linear and hysteresis is low. A weighed linear fit shows a
-29.19 ± 0.08 mV/A correlation with 8.06V supplied which results in a sensitivity of 3.70 ± 0.01
mV/V/A.
- 122 -
www.nve.com phone: 952-829-9217 fax: 952-829-9189
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