©
National Instruments Corporation
17
SCC-SG Series Strain-Gauge Modules User Guide
The following symbols apply to the circuit diagram and equations:
•
R
1
is an active element measuring compressive strain (–
ε
).
•
R
2
is an active element measuring tensile strain (+
ε
).
•
R
3
is an active element measuring compressive strain (–
ε
).
•
R
4
is an active element measuring tensile strain (+
ε
).
Figure 15 shows how to set up two full-bridge type I configurations with
the SCC-SG04/24.
Full-Bridge Type II
This section provides information for the full-bridge type II strain-gauge
configuration. The full-bridge type II only measures bending strain.
Figure 13 shows a general full-bridge type II circuit diagram.
Figure 13.
Full-Bridge Type II Circuit Diagram
The following symbols apply to the circuit diagram and equations:
•
R
1
is an active element measuring compressive Poisson effect (–
νε
).
•
R
2
is an active element measuring tensile Poisson effect (+
νε
).
•
R
3
is an active element measuring compressive strain (–
ε
).
•
R
4
is an active element measuring tensile strain (+
ε
).
Figure 15 shows how to set up two full-bridge type II configurations with
the SCC-SG04/24.
+
–
–
+
V
EX
V
CH
R
4
(+ )
R
3
(– )
R
2
R
1
(– )
(+ )
