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SCXI-1321 Terminal Block Installation Guide 10 ni.com
Assuming a strain-gauge range with a gauge factor of GF = 2 and a
quarter-bridge configuration, this range corresponds to ±1,498 µε, as given
by the strain formula for a quarter-bridge strain-gauge configuration:
where
Figure 3. Quarter-Bridge Nulling Circuit
ε
4V
r
–
GF 12V
r
+()
-------------------------------=
V
r
strained voltage static unstrained voltage–
V
exc
--------------------------------------------------------------------------------------------------------=
CH+CH+
CH–
EX+
EX–
+
–
+
–
R
1
R
2
4.5 kΩ
4.5 kΩ
R
SCAL
301 kΩ
R
Tr im
10 kΩ
R
Null
39.1 kΩ
(Screw Adjusts Potentiometer)
R
L
R
L
R
L
R
3
(dummy)
R
4
(gauge)
EX+
CH+
CH+
CH–
EX+
EX–
R
Tr im
SCXI-1121 SCXI-1321 Transducer
V
EX
Note: R
1
and R
2
are completion resistors.