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National Instruments Corporation
7
SCXI-1314T TEDS Bridge Sensor Terminal Block
Quarter-Bridge
This section shows the quarter-bridge signal connections. Figure 3 shows
the quarter-bridge circuit wiring diagram.
Note
AI – is left unwired. Set the SCXI-1520 module to internal half-bridge completion.
Refer to the
SCXI-1520 User Manual
for more information.
Figure 3.
Quarter-Bridge 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 the quarter-bridge completion resistor (dummy resistor) you
provide externally to the SCXI-1314T.
•
R
4
is the active measuring element.
+
–
+
–
AI +
EX +
EX –
R
L
R
L
R
L
SCA
SCA
Shunt
Cal A
SCXI-1520
Bridge Configuration
Set to Half Bridge
SCXI-1314T
TEDS Transducer
V
AI
R
1
R
2
R
S
R
4
(gauge)
V
EX
R
3
(dummy)
R
L
R
L
+
–
V
RS
RS +
RS –
R
L
R
L
2
6
7
1
10
4
5
TEDS EEPROM
T +
T –
8
9
Digital
Bus
TEDS
Comm
Circuitry
Digital
Communication
Circuitry