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AM25T Solid State Multiplexer

6.2.2 Example CR23X Program

The CR23X uses Instruction 134 for measuring thermocouples or voltages

with the AM25T. Example 5 is a portion of a datalogger program that uses the

instruction to measure 25 type T thermocouples. Instruction 134 automatically

compensates for long lead lengths.

TABLE 6-5. Wiring for CR23X Example

Function AM25T CR23X

+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

Example 5. CR23X Program for Measuring 25 Type T Thermocouples

;{CR23X}

;

*Table 1 Program

01: 1 Execution Interval (seconds)

01: AM25TMultiplexer (P134)

1: 25 Reps

2: 21 10 mV, 60 Hz Reject, Slow Range

3: 1 AM25T Channel

4: 1 DIFF Channel

5: 21 Exchan 1, 60 Hz Reject

6: 1 Clock Control

7: 2 Reset Control

8: 1 Type T (Copper-Constantan)

9: 1 Ref Temp (Deg. C) Loc [ RefTemp ]

10: 2 Loc [ TC_1 ]

11: 1.0 Mult

12: 0.0 Offset

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 33 34

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Campbell AM25T Especificaciones Pagina 22