Campbell AM16/32, Instruction Manual

Page: 32 / 46

AM16/32 Relay Analog Multiplexer
26
21x
CR7 CR10(X)
CR23X/
CR5000
"4 X 16" Mode
E E
H H
AG
G
E/VX
H
L L
L
COM H (ODD)
COM L
COM H (EVEN)
COM L
ODD H
ODD L
EVEN H
EVEN L
SHIELD SENSOR SHIELDS COM
H H
H
L L
L
FIGURE 14. Four Wire Half Bridge Hook-up and Measurement
The CR5000 also has current excitation channels which allow a
resistance measurement. Because the excitation current is known, it is
not necessary to measure the voltage across a fixed resistor to
determine the current as in Figure 14. See Section 5.3 for an example.
21x
CR7 CR10(X)
"4 X 16" Mode
E E
AG
G
E/VX
COM H (ODD)
COM L
COM H (EVEN)
COM L
ODD H
ODD L
EVEN H
EVEN L
SHIELD SENSOR SHIELDS COM
H H
H
L L
L
CR23X/
CR5000
FIGURE 15. Full Bridge Measurement
6.4 Full Bridge Measurements
Sensor to Multiplexer wiring – With panel switch set to “4X16” mode,
excitation, ground, and the two signal leads may be connected to one
input SET (Figure 15).
Multiplexer to Datalogger wiring - COM terminals are connected to a
datalogger excitation channel, a differential analog input channel, and
an analog ground. Up to sixteen full bridges may be multiplexed
through the AM16/32.
CR23X/
21X CR1000/
CR7 CR10(X) CR5000
CR23X/
21X CR1000/
CR7 CR10(X) CR5000