Download National Instruments Module SCXI-1503 User's Manual

Chapter 2
Connecting Signals
Lead-Resistance Compensation Using a 3-Wire Resistive Sensor and
Two Matched Current Sources
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
SCXI-1306
RL1
SCXI-1503
EX0+
AI0+
AI0–
+
–
I = 100 µA
+
–
I = 100 µA
EX0–
RT
ON
RL2
RL3
EX1+
AI1+
AI1–
EX1–
ON
Figure 2-4. 3-Wire Configuration Using Matched Current Sources
SCXI-1503 User Manual
2-6
ni.com