Campbell Scientific 4WPB100, 4WPB1K PRT Terminal Input Modules - Manual (Page 6)

4WPB100, 4WPB1K PRT Bridge Terminal Input Modules
2
GND
HI
LO
Rf
GND
H
L
Rf = 100 , 1k
Vx
10k
5%
Rs
HI
LO
0.01%
FIGURE 2-1. Circuit Schematic
3. Wiring
The Terminal input module is connected to the appropriate channel. The
dashed lines in Figure 2-1 indicate the sensor wiring. When making 4 wire
half bridge measurements, the 4WPB is connected to a differential channel and
the sense leads from the PRT to the next differential channel. The black
excitation wire is connected to the excitation channel. In the following
examples the 4WPB is connected to differential channel 1 and the PRT to
differential channel 2; the excitation wire is connected to excitation channel 1
(Figure 3-1).
Ex1
1H
1L
AG or
2H
2L
PRT
4WPB100
L
G
Datalogger
FIGURE 3-1. Wiring for Example Programs