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3-Wire Transducer
SCXI-1317 Terminal Block Installation Guide
•
V
is the excitation voltage.
EX
•
R
is the lead resistance.
L
•
V
is the measured voltage.
AI
SCXI-1317
R
Ex+
L
R
4 (gauge)
AI
R
L
QTR
R
L
GND
Figure 2. Quarter-Bridge Circuit Diagram Using a 3-Wire Strain Gauge
The following symbols apply to the circuit diagram and equations:
•
R
and R
are half-bridge completion resistors.
1
2
•
R
is the quarter-bridge completion resistor (dummy resistor).
3
•
R
is the active measuring element.
4
•
R
is the shunt-calibration resistor.
SCAL
•
V
is the excitation voltage.
EX
•
R
is the lead resistance.
L
•
V
is the measured voltage.
AI
SCXI-1521/B
+
–
R
1
R
2
R
3 (QTR)
4
+
V
EX
–
V
AI
R
SCAL
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