Campbell Scientific AM416 Multiplexer - Manual (Page 16)

AM416 RELAY MULTIPLEXER
10
BEGINNING OF POTENTIOMETER
MEASUREMENT LOOP
06:
P87 Beginning of Loop
01: 0 Delay
02: 6 Loop Count
07: P90 Step Loop Index (Extended)
01: 2 Step
CLOCK PULSE
08:
P22 Excitation with Delay
01: 1 EX Chan
02: 1 Delay w/EX (units=.01sec)
03: 1 Delay after EX (units=.01sec)
04: 5000 mV Excitation
POTENTIOMETER MEASUREMENT
INSTRUCTION
09:
P4 Excite,Delay,Volt(SE)
01: 2 Reps
02: 5 5000 mV slow Range
03: 1 IN Chan
04: 2 Excite all reps w/EXchan 2
05: 1 Delay (units .01sec)
06: 5000 mV Excitation
07: 11-- Loc [:POT #1 ]
08: 1 Mult
09: 0 Offset
END OF POTENTIOMETER MEASUREMENT
LOOP
10:
P95 End
DISABLES MULTIPLEXER
11:
P20 Set Port
01: 0 Set low
02: 1 Port Number
12: P End Table 1
INPUT LOCATION LABELS:
1:STRAIN #1
13:POT #3
2:STRAIN #2 14:POT #4
3:STRAIN #3 15:POT #5
4:STRAIN #4 16:POT #6
5:STRAIN #5 17:POT #7
6:STRAIN #6 18:POT #8
7:STRAIN #7 19:POT #9
8:STRAIN #8 20:POT #10
9:STRAIN #9 21:POT #11
10:STRAIN#10 22:POT #12
11:POT #1 23:_________
12:POT #2 24:_________
5.3 GENERAL PROGRAMMING
CONSIDERATIONS
The excitation voltage, integration and delay
times associated with reading the signal, and
the speed with which the channels are switched
may be varied with the datalogger program. In
general, longer delay times are necessary when
the sensor and datalogger are separated by
long lead lengths. Consult your datalogger
manual for additional information on these
topics.
6. SENSOR HOOK-UP AND
MEASUREMENT EXAMPLES
This section covers sensor-AM416 connections
as well as AM416-datalogger measurement
connections. The following are examples only,
and should not be construed as the only way to
make a particular measurement. See the
Measurement Section of your datalogger
manual for more information on the basic bridge
measurements. Most of the following examples
do not depict datalogger-AM416 control
connections (Section 4), but their presence is
implied and required. CSI recommends that
only sensor shield (drain) wires be connected to
AM416 shield terminals.
6.1 SINGLE-ENDED ANALOG MEASUREMENT
WITHOUT SENSOR EXCITATION
Sensor to Multiplexer wiring - up to two single-
ended sensors that don't require excitation may
be connected to one AM416 input SET.
Multiplexer to Datalogger wiring - Signal lines
from COM terminals are input into two
consecutive single-ended analog input
channels. Signal ground lines are tied to analog
ground (AG) in the CR10(X), datalogger ground
in the 21X and CR7. The COM shield line is
tied to datalogger earth ground. Up to 32
single-ended sensors may be used by two
single-ended datalogger channels in this
manner.
NOTE: Low level single-ended
measurements are not recommended in a
21X application in which the 21X's internal
12VDC supply is being used to power the
multiplexer or other peripherals (Section
4.1.4).