Campbell Scientific 253 253-L and 257-L (Watermark 200) Soil Matric Potential - Page 27

Calculate 0.018 * dT

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253-L and 257-L Soil Matric Potential Sensors ;{CR10X} *Table 1 Program 01: 1.0000 Execution Interval (seconds) ;Measure soil temperature with 107 sensor 1: Temp (107) (P11) 1: 1 Reps 2: 1 SE Channel 3: 1 Excite all reps w/E1 4: 1 Loc [ Tsoil_C ] 5: 1.0 Multiplier 6: 0.0 Offset ;Measure 257 block resistance 2: AC Half Bridge (P5) 1: 1 Reps 2: 14 250 mV Fast Range 3: 2 SE Channel 4: 2 Excite all reps w/Exchan 2 5: 250 mV Excitation 6: 2 Loc [ kOhms ] 7: 1 Multiplier 8: 0 Offset ;Convert Half Bridge reading to kOhms 3: BR Transform Rf[X/(1-X)] (P59) 1: 1 Reps 2: 2 Loc [ kOhms ] 3: 1 Multiplier (Rf) ;Calculate dT = T -21 4: Z=X+F (P34) 1: 1 X Loc [ Tsoil_C ] 2: -21 F 3: 4 Z Loc [ CorFactr ] ;Calculate (0.018 * dT) 5: Z=X*F (P37) 1: 4 X Loc [ CorFactr ] 2: 0.018 F 3: 4 Z Loc [ CorFactr ] ;Calculate (1 - (0.018 * dT)) 6: Z=X+F (P34) 1: 4 X Loc [ CorFactr ] 2: -1 F 3: 4 Z Loc [ CorFactr ] 7: Z=X*F (P37) 1: 4 2: -1 3: 4 X Loc [ CorFactr ] F Z Loc [ CorFactr ] 21

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253-L and 257-L Soil Matric Potential Sensors
;{CR10X}
*Table 1 Program
01: 1.0000
Execution Interval (seconds)
;Measure soil temperature with 107 sensor
1:
Temp (107) (P11)
1:
1
Reps
2:
1
SE Channel
3:
1
Excite all reps w/E1
4:
1
Loc [ Tsoil_C
]
5:
1.0
Multiplier
6:
0.0
Offset
;Measure 257 block resistance
2:
AC Half Bridge (P5)
1:
1
Reps
2:
14
250 mV Fast Range
3:
2
SE Channel
4:
2
Excite all reps w/Exchan 2
5:
250
mV Excitation
6:
2
Loc [ kOhms
]
7:
1
Multiplier
8:
0
Offset
;Convert Half Bridge reading to kOhms
3:
BR Transform Rf[X/(1-X)] (P59)
1:
1
Reps
2:
2
Loc [ kOhms
]
3:
1
Multiplier (Rf)
;Calculate dT = T -21
4:
Z=X+F (P34)
1:
1
X Loc [ Tsoil_C
]
2:
-21
F
3:
4
Z Loc [ CorFactr
]
;Calculate (0.018 * dT)
5:
Z=X*F (P37)
1:
4
X Loc [ CorFactr
]
2:
0.018
F
3:
4
Z Loc [ CorFactr
]
;Calculate (1 - (0.018 * dT))
6:
Z=X+F (P34)
1:
4
X Loc [ CorFactr
]
2:
-1
F
3:
4
Z Loc [ CorFactr
]
7:
Z=X*F (P37)
1:
4
X Loc [ CorFactr
]
2:
-1
F
3:
4
Z Loc [ CorFactr
]
21