Campbell Scientific AM25T 25-Channel Solid State Multiplexer - Manual (Page 25)

Appendix A. Single-Ended Measurements
05: Temperature RTD (P16) ;Calculate reference temperature
1: 1 Reps
2: 1 R/R0 Loc [ RefTemp_C ]
3: 1 Loc [ RefTemp_C ]
4: 1.0 Mult
5: 0.0 Offset
06: Beginning of Loop (P87)
;Loop through thermocouple channels
1: 0 Delay
2: 25 Loop Count
07: Step Loop Index (P90)
;Set index to advance 2 locations/loop
1: 2 Step
08: Do (P86)
;Clock the AM25T twice
1: 71 Pulse Port 1
09: Do (P86)
1: 71
Pulse Port 1
10: Thermocouple Temp (SE) (P13)
;Measure the connected thermocouple
1: 2 Reps
2: 21 2.5 mV 60 Hz Rejection Range
3: 1 SE Channel
4: 1 Type T (Copper-Constantan)
5: 1 Ref Temp (Deg. C) Loc [ RefTemp_C ]
6: 2-- Loc [ TC_1 ]
7: 1.0 Mult
8: 0.0 Offset
11: End (P95)
;End loop
12: Do (P86)
;Turn off AM25T
1: 52 Set Port 2 Low
Example A-2. 21X Program for Measuring 50 Type T Thermocouples or Voltage Sensors
Using a Single-ended Instruction
*Table 1 Program
01: 10 Execution Interval (seconds)
01: Do (P86) ;Turn On AM25T
1: 42 Set Port 2 High
02: Full Bridge (P6) ;Measure the output of the reference temp. full bridge
1: 1 Reps
2: 3 50 mV Slow Range ;See Table 6-1 for older AM25T multiplexers
3: 1 DIFF Channel
4: 1 Excite all reps w/Exchan 1
5: 2400 mV Excitation ;See Table 6-1 for older AM25T multiplexers
6: 1 Loc [ RefTemp_C ]
7: -0.001 Mult
8: 0.09707 Offset
A-3