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AM25T Solid State Multiplexer

Example 4. CR10(X) Program for Measuring 25 Type T Thermocouples with the Differential

Thermocouple Instruction and Long Lead Length Compensation on the RTD Measurement

*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)

1: 42 Set Port 2 High ;Turn On AM25T

03: Full Bridge (P6) ;Measure the output of the reference temp. full bridge, Vs

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: 27 Loc [ Vs ]

7: 1 Mult

8: 0 Offset

04: Do (P86) ;Clock to advance to measure excitation

1: 71 Pulse Port 1

05: Full Bridge (P6) ;Measure the Excitation at the full bridge, Vx

1: 1 Reps

2: 25 2500 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: 28 Loc [ Vx ]

7: .001 Mult

8: 0 Offset

06: Z=X/Y (P38) ;Calculate Vs/Vx

1: 27 X Loc [ Vs ]

2: 28 Y Loc [ Vx ]

3: 1 Z Loc [ RefTemp_C ]

07: Z=X*F (P37)

1: 1 X Loc [ RefTemp_C ]

2: -0.001 F

3: 1 Z Loc [ RefTemp_C ]

08: Z=X+F (P34)

1: 1 X Loc [ RefTemp_C ]

2: .09707 F

3: 1 Z Loc [ RefTemp_C ]

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 33 34

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Campbell AM25T Spezifikationen Seite 20