Campbell-scientific 110PV Surface Temperature Probe Bedienungsanleitung PDF herunterladen (Seite 22)

110PV Surface Temperature Probe

Example Program for CR10X

;{CR10X}

;This program measures a single 110PV-L probe utilizing the

;P5 instruction once a second and stores the average

;temperature in degrees C every ten minutes.

*Table 1 Program

01: 1 Execution Interval (seconds)

;Measure 110PV-L Probe

1: AC Half Bridge (P5)

1: 1 Reps

2: 25 2500 mV 60 Hz Rejection Range

3: 1 SE Channel

4: 1 Excite all reps w/Exchan 1

5: 2500 mV Excitation

6: 1 Loc [ V_Vx ]

7: 1.0 Multiplier

8: 0.0 Offset

;Convert ratio-metric output to resistance (next three instructions)

2: Z=1/X (P42)

1: 1 X Loc [ V_Vx ]

2: 2 Z Loc [ Vx_V ]

3: Z=X+F (P34)

1: 2 X Loc [ Vx_V ]

2: -1.0 F

3: 3 Z Loc [ Vx_V1 ]

4: Z=X*F (P37)

1: 3 X Loc [ Vx_V1 ]

2: 4990 F

3: 4 Z Loc [ Rx ]

;Correct for cable resistance (see 110PV-L cable label for resistance value F in Ohms)

5: Z=X+F (P34)

1: 4 X Loc [ Rx ]

2: 0.0 F

3: 5 Z Loc [ Rtherm ]

;Convert resistance to Temperature

6: Steinhart-Hart Equation (P200)

1: 1 Reps

2: 5 Source Loc (R)(Ohms) [ Rtherm ]

3: 6 Destination Loc (Deg C) [ Temp_C ]

4: 1.12924 A

5: -3 x 10^n

6: 2.34108 B

7: -4 x 10^n

8: 8.77547 C

9: -8 x 10^n

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 31 32

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