Chapter 2
Connecting Signals
NI PXI-4220 User Manual
2-8
ni.com
Half-Bridge Type II
This section provides information about connecting the half-bridge
strain-gauge configuration type II. Figure 2-7 shows the half-bridge type II
circuit wiring diagram. Refer to the
Half-Bridge Type II
section of
Chapter 4,
Theory of Operation
, for more information.
Figure 2-7.
Half-Bridge Type II Circuit Diagram
The following symbols apply to the circuit diagram and equations:
•
R
1
and R
2
are half-bridge completion resistors.
•
R
3
is an active element measuring compressive strain (–
ε)
.
•
R
4
is an active element measuring tensile strain (+
ε
).
•
V
EX
is the excitation voltage.
•
R
L
is the lead resistance.
•
V
CH
is the voltage measured.
•
R
S
is shunt calibration resistor A.
+
–
+
–
R
L
R
L
NI PXI-4220
Transducer
R
1
R
2
R
4
R
3
V
CH
Shunt
Cal A
R
L
R
S
V
EX
R
L
S+ (Pin 1)
P+ (Pin 2)
P– (Pin 7)
SCA (Pin 4)
SCCOM (Pin 5)
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
