Campbell Scientific AM16/32A Multiplexer - Manual (Page 29)

AM16/32A Relay Analog Multiplexer
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).
5000 "2 X 32" Mode
COM ODD H
COM ODD L
ODD H
ODD L
(+) SENSOR
(-)
COM
AM16/32
MUXSIGNAL
SHIELD
SENSOR SHIELD
21X/
CR7 CR10(X)
CR23X/CR3000/
CR800/CR850/
CR1000/CR5000
H H H
AG
G
FIGURE 10. Single-ended Measurement without Excitation
5000 "4 X 16" Mode
COM ODD H
COM ODD L
ODD H
ODD L
(+) SENSOR
(-)
COM
AM16/32
MUXSIGNAL
SHIELD
SENSOR SHIELD
21X/
CR7 CR10(X)
CR23X/CR3000/
CR800/CR850/
CR1000/CR5000
H H H
L L L
G
FIGURE 11. Differential Measurement without Excitation
6.2 Differential Analog Measurement without Sensor
Excitation
at
th panel
tch set to “4x16” mode. Sensor shields are connected to the input
Sensor to Multiplexer wiring - Up to two differential sensors th
don't require excitation may be connected to one input SET wi
swi
“
” terminals.
Multiplexer to Datalogger wiring - The two pairs of COM terminals
(O D H, ODD L
D and EVEN H, EVEN L) are connected to two pairs
of differential analog inputs at the datalogger. Observe H to H and L
ential sensors in SETs of two with appropriate
programming.
NOTE
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 differ
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