Campbell AM25T Spécifications télécharger pdf (Page 26)

Appendix A. Single-Ended Measurements

A-2

A.1.1 Thermocouple Measurements

Wire the high side of each thermocouple into an input terminal. The low side

of each thermocouple is wired into the adjacent ground terminal (Figure A-1).

FIGURE A-1. Single-ended Measurement of a Type T Thermocouple

Example A-1. CR10 Program for Measuring 50 Type T Thermocouples or Voltage Sensors

Using a Single-Ended 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: 24 250 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

04: BR Transform Rf[X/(1-X)] (P59) ;Calculate RTD resistance R/R0

1: 1 Reps

2: 1 Loc [ RefTemp_C ]

3: 10.025 Multiplier (Rf)

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 35 36

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Campbell AM25T Spécifications Page 26