Specifications

AM25T Solid State Multiplexer
9
Input locations within the measurement loops must be indexed (--), see
Instruction 87 in the datalogger manual. To index a location, using Edlog ver
6.0 or greater, move the cursor to the Input location label and press “F4”. To
index a location with the datalogger keyboard, press the “C” key when
entering the location number and before the “A” key is pressed.
TABLE 6-1. RTD Excitation Voltage and Measurement Range for AM25T
Multiplexers Prior to Serial Number 1839
Datalogger Temperature Range Excitation voltage Vs Range Vx Range
21X -40 to 85°C
-24 to 65°C
250 mV
350 mV
± 5 mV
± 5 mV
± 500 mV
± 500 mV
CR10(X) -40 to 85°C
-11 to 52°C
350 mV
250 mV
± 7.5 mV
± 2.5 mV
± 2500 mV
± 250 mV
CR7 -40 to 85°C 350 mV
± 15 mV ± 500 mV
TABLE 6-2. Wiring for CR10(X) Examples
Function AM25T CR10(X)
+12V Power 12 V 12 V
Power and Shield Ground
G
Clock CLK C1
Reset RES C2
RTD Excitation EX E1
Analog Ground AG AG
Common High HI 1H
Common Low LO 1L
Example 1. CR10(X) Program for Measuring 25 Type T Thermocouples or Voltage Sensors
Using a Differential Instruction
*Table 1 Program
01: 10 Execution Interval (seconds)
01: Set Port(s) (P20) ;Configure Control Ports for 1 millisecond pulse
1: 9999 C8..C5 = nc/nc/nc/nc
2: 9933 C4..C1 = nc/nc/1ms/1ms
02: Do (P86) ;Turn On AM25T
1: 42 Set Port 2 High
03: Full Bridge (P6) ;Measure the output of the reference temp. full bridge
1: 1 Reps
2: 23 25 mV 60 Hz Rejection Range ;See Table 6-1 for older AM25T multiplexers
3: 1 DIFF Channel
4: 1 Excite all reps w/Exchan 1
5: 1200 mV Excitation ;See Table 6-1 for older AM25T multiplexers
6: 1 Loc [ RefTemp_C ]
7: -0.001 Mult
8: 0.09707 Offset