Datasheet

SBOA102A
January 2005
Sensor-Emulator-EVM
System Reference Guide
8
Bridge sensitivity vs. temp
0.0E+00
5.0E-02
1.0E-01
1.5E-01
2.0E-01
2.5E-01
3.0E-01
3.5E-01
-50 0 50 100 150
Temp, degC
Kbridge, V/V or Vbridge@Vexc=1V
Offset
Span
Kbridge vs. pressure @Troom
0.0E+00
5.0E-02
1.0E-01
1.5E-01
2.0E-01
2.5E-01
3.0E-01
3.5E-01
4.0E-01
0 10 20 30 40 50 60 70 80 90 100
Pressure
Kbridge, V/V, or Vbridge@Vexc=1V
An important aspect of pressure sensors is how they drift with temperature. Figure 2.3 is an example of span and
offset drift with temperature for a typical resistive bridge sensor. Note that the drift is fairly large and nonlinear.
Figure 2.4 is an example of how a bridge sensor can be nonlinearwith applied stimulus (in this example the
stimulus is pressure). The sensor emulator can be configured to reproduce these characteristics for most sensors.
Note that the graphs are shown in a normalized format. The normalized format allows the graph to be easily
scaled by multiplying by the bridge excitation voltage.
Figure 2.3 Figure 2.4
Drift and Nonlinearity
with a Bridge Sensor