Lead-Resistance Compensation Using A 3-Wire Resistive Sensor And Two Matched Current Sources; Figure 2-4. 3-Wire Configuration Using Matched Current Sources - National Instruments Module SCXI-1503 User Manual

Chapter 2 Connecting Signals
Lead-Resistance Compensation Using a 3-Wire Resistive Sensor and
Two Matched Current Sources
SCXI-1503 User Manual
You can compensate for the errors introduced by lead-resistance voltage
drops by using a 3-wire resistive sensor and two matched current sources
connected as shown in Figure 2-4.
External Sensor
R
L1
R
T
R
L2
R
L3

Figure 2-4. 3-Wire Configuration Using Matched Current Sources

SCXI-1306
EX0+
AI0+
AI0–
EX0–
ON
EX1+
AI1+
AI1–
EX1–
ON
2-6
SCXI-1503
+
I = 100 µA
–
+
I = 100 µA
–
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