参数资料
型号: SENSOREMULATOREVM
厂商: Texas Instruments
文件页数: 9/47页
文件大小: 0K
描述: EMULATOR SENSOR
标准包装: 1
传感器类型: 激磁电压电桥传感器仿真器
嵌入式:
已供物品:
产品目录页面: 1078 (CN2011-ZH PDF)
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其它名称: 296-20990
Emulating
R101
5.0V
Input To Bridge
Vexc
(Excitation voltage)
Bridge Sensor Outputs
This is a simplified diagram of how the sensor emulator
generates a bridge output voltage. The potentiometer
R8
2.5V
10k
10k
R102
200 ohm
2.526V
Wiper at top
to
2.475V
Wiper at bottom
Output of Sensor
Vin+ to Signal
Conditioning Chip
R102 is adjusted to set the output voltage of the
emulated bridge (V in+ with respect to V in- ). The
potentiometer R103 is used to make fine adjustments in
R103
10 ohm
the output value. R8 and R9 set a common mode
voltage for the other leg of the bridge. R101 and R104
R9
10k
R104
10k
V dif =
26mV
to
-25mV
set the adjustable output range of the emulated bridge.
For the configuration shown, the output range is -25mV
to +26mV (V dif = V in- - V in+ ). Selecting a different value
for R101 and R104 can expand this range. On the
Sensor-Emulator-EVM, 11 channels like this one are
selectable using a rotary switch.
2.5V
Output of Sensor
Vin- to Signal
Conditioning Chip
Positive full scale of the emulator Negative full scale of the emulator
Figure 2.5
R104 := 10 ? 10
R101 := 10 ? 10
R104 := 10 ? 10
R101 := 10 ? 10
Vexc := 5
3
R102 := 200
3
Vexc := 5
3
R102 := 200
3
R102a := 200 Wiper position at top of POT
R102a := 0
Wiper position at bottom of POT
R103 := 10
Pot set to maximum Resistance
R103 := 0
Pot set to Minimum Resistance
Vdif :=
Vexc ? ( R104 + R103 + R102a )
R101 + R104 + R103 + R102
?
Vexc
2
Vdif :=
Vexc ? ( R104 + R103 + R102a )
R101 + R104 + R103 + R102
?
Vexc
2
Vdif = 0.026
Positive full scale output of emulator
Vdif = ? 0.025
Negative full scale output of emulator
SBOA102A
January 2005
Sensor-Emulator-EVM
System Reference Guide
9
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