Campbell AM16/32, Instruction Manual

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AM16/32 Relay Analog Multiplexer
23
Low level single-ended measurements are not
recommended in 21X applications where the 21X's
internal 12VDC supply is used to power the multiplexer
or other peripherals (see Section 4.1.4).
21x
CR7 CR10(X) CR23X/CR5000 "2 X 32" Mode
H H
AG
G
H COM ODD H
COM ODD L
ODD H
ODD L
(+) SENSOR
(-)
COM
AM16/32
MUXSIGNAL
SHIELD
SENSOR SHIELD
FIGURE 10. Single-ended Measurement without Excitation
21x
CR7 CR10(X) CR23X/CR5000 "4 X 16" Mode
H H
L L
G
H
L
COM ODD H
COM ODD L
ODD H
ODD L
(+) SENSOR
(-)
COM
AM16/32
MUXSIGNAL
SHIELD
SENSOR SHIELD
FIGURE 11. Differential Measurement without Excitation
6.2 Differential Analog Measurement without Sensor
Excitation
Sensor to Multiplexer wiring - Up to two differential sensors that don't
require excitation may be connected to one input SET with panel
switch set to “4X16” mode. Sensor shields are connected to the input
“
” terminals.
Multiplexer to Datalogger wiring - The two pairs of COM terminals
(ODD H, ODD L and EVEN H, EVEN L) are connected to two pairs
of differential analog inputs at the datalogger. Observe H to H and L
to L from sensor to multiplexer to analog input. In “4X16” mode up to
32 differential sensors can be measured by two differential datalogger
channels in this way.
With panel switch set to “2X32” mode, one differential input can
measure up to 32 differential sensors in SETs of two with appropriate
programming.
NOTE
21X CR23X/
CR7
CR10(X) CR1000/CR5000
21X CR23X/
CR7
CR10(X) CR1000/CR5000