©
National Instruments Corporation
11
SCXI-1314T TEDS Bridge Sensor Terminal Block
Full-Bridge
This section shows the full-bridge signal connections. Figure 5 shows the
full-bridge circuit wiring diagram.
Figure 5.
Full-Bridge Circuit Diagram
The following symbols apply to the circuit diagram and equations:
•
R
1
, R
2
, R
3
, and R
4
are active measuring elements.
•
V
EX
is the excitation voltage.
•
R
L
is the lead resistance.
•
V
AI
is the measured voltage.
•
V
RS
is the remote sense measured excitation voltage.
•
T +
is the TEDS data transmission line.
•
T –
is the TEDS ground reference.
+
–
+
–
AI +
EX +
EX –
R
L
R
L
R
L
SCA
SCA
Shunt
Cal A
SCXI-1520
Bridge Configuration
Set to Full Bridge
SCXI-1314T
TEDS Transducer
V
AI
R
S
V
EX
R
L
R
L
+
–
V
RS
RS +
RS –
2
6
7
1
10
4
5
TEDS EEPROM
T +
T –
8
9
Digital
Bus
TEDS
Comm
Circuitry
Digital
Communication
Circuitry
V
EX
+
V
EX
–
R
1
R
2
R
4
R
3
AI +
AI –
AI –
3
R
L
R
L