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