©
National Instruments Corporation
19
SCC-SG Series Strain-Gauge Modules User Guide
Figure 15.
SCC-SG04/24 Full-Bridge Configuration Connection (Two Channels)
To connect a single full-bridge configuration to a channel, use four lead
wires to connect the strain gauges to screw terminals V
EX
+, V
EX
–,
ACH(
X
)+, and ACH(
X
)–. The two wires connected to V
EX
+ and V
EX
–
provide excitation voltage to the strain gauges. The other two wires,
connected to ACH(
X
)+ and ACH(
X
)–, sense the output voltage of the strain
gauges. Figure 15 shows two full-bridge configurations using ACH(
X
) and
ACH(
X
+8).
1
The SCC-SG24 provides a 10 VDC excitation current.
2
By factory-default the nulling resistors are not installed in the SCC-SG24.
ACH(
X
)+
V
EX
+
ACH(
X
+8)+
+
–
R
NULL
2
+
–
R
NULL
2
V
EX
–
R
3
R
4
R
1
R
2
R
3
R
4
R
1
R
2
ACH(
X
)–
ACH(
X
+8)–
6
5
4
3
2
1
Trimming
Potentiometer
2.5 V
Trimming
Potentiometer
2.5 V
2.5 V
1
Analog Ground
