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AM25T Solid State Multiplexer

12: Beginning of Loop (P87) ;Loop through thermocouple channels

1: 0 Delay

2: 25 Loop Count

13: Do (P86) ;Clock the AM25T twice

1: 71 Pulse Port 1

14: Do (P86)

1: 71 Pulse Port 1

15: Thermocouple Temp (DIFF) (P14) ;Measure the connected thermocouple

1: 1 Reps

2: 21 2.5 mV 60 Hz Rejection Range

3: 1 DIFF 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

16: End (P95) ;End loop

17: Do (P86) ;Turn off AM25T

1: 52 Set Port 2 Low

6.2 Example 21X Programs

The two example 21X programs in this section cover measuring thermocouples

with the differential measurement instruction.

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 6-3. Wiring for 21X Examples

Function AM25T 21X

+12V Power 12 V 12 V

Power and Shield Ground

Clock CLK C1

Reset RES C2

RTD Excitation EX E1

Analog Ground AG

Common High HI 1H

Common Low LO 1L

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 35 36

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Campbell AM25T Spezifikationen Seite 16