©
National Instruments Corporation
11
SCXI-1321 Terminal Block Installation Guide
Figure 4.
Half-Bridge Nulling Circuit
CH+
CH+
CH–
EX+
EX–
+
–
+
–
R
1
R
2
4.5 k
Ω
4.5 k
Ω
R
SCAL
301 k
Ω
R
Trim
10 k
Ω
R
Null
39.1 k
Ω
(Screw Adjusts Potentiometer)
R
L
R
L
R
L
R
4
(gauge)
EX+
CH+
CH+
CH–
EX+
EX–
R
Trim
SCXI-1121
SCXI-1321
Transducer
V
EX
EX–
R
3
(gauge)
Note: R
1
and R
2
are completion resistors.
