Campbell-scientific CR7 Measurement and Control System User Manual Page 81
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SECTION 7. MEASUREMENT PROGRAMMING EXAMPLES
7-13
02: P34 Z=X+F
01: 1 X Loc mm RAW
02: 266 F
03: 2 Z Loc [:mm CORECT]
7.16 227 GYPSUM SOIL MOISTURE
BLOCK
Soil moisture is measured with a gypsum block
by relating the change in moisture to the change
in resistance of the block. An AC Half Bridge
(Instruction 5) is used to determine the
resistance of the gypsum block. Rapid reversal
of the excitation voltage inhibits polarization of
the sensor. Polarization creates an error in the
output so the fast integration time is used. The
output of Instruction 5 is the ratio of the mid-
bridge voltage to the excitation voltage, this
output is converted to gypsum block resistance
with Instruction 59, Bridge Transform.
The Campbell Scientific 227 Soil Moisture Block
uses a Delmhorst gypsum block with a 1 kohm
bridge completion resistor. Using data supplied
by Delmhorst, Campbell Scientific has
computed coefficients for a 5th order polynomial
to convert block resistance to water potential in
bars. There are two polynomials, one to
optimize the range from -0.1 to -2 bars and one
to cover the range from -0.1 to -15 bars (the
minus sign is omitted in the output). The -0.1 to
-2 bar polynomial requires a multiplier of 1 in the
Bridge Transform Instruction (result in Kohms)
and the -0.1 to -15 bar polynomial requires a
multiplier of 0.1 (result in 10,000s of ohms).
The multiplier is a scaling factor to maintain the
maximum number of significant digits in the
coefficients of the polynomial.
In this example, we wish to make
measurements on 12 gypsum blocks and output
the final data in bars. The soil where the
moisture measurements are to be made is quite
wet at the time the data logging is initiated, but
is expected to dry beyond the -2 bar limit of the
wet range polynomial. The dry range
polynomial is used, so a multiplier of 0.1 is
entered in the bridge transform instruction.
When the water potential is computed it is
written over the resistance value. The
potentials are stored in Input locations 1-12
where they may be accessed for output to Final
Storage. If it was desired to retain the
resistance values the potential measurements
could be stored in locations 13-24 by changing
parameter 3 in Instruction 55 to 13.
FIGURE 7.16-1. 12 Gypsum Blocks
Connected to the CR7
The first 6 blocks are excited by excitation
channel 1 and the last 6 by channel 2. Thus, 6
is entered for the number of measurements per
excitation channel in Parameter 7 of Instruction
5.
PROGRAM
01: P5 AC Half Bridge
01: 12 Reps
02: 16 500 mV fast Range
03: 1 IN Card
04: 1 IN Chan
05: 1 EX Card
06: 6 EX Chan
07: 6 Meas/EX
08: 500 mV Excitation
09: 1 Loc [:POTEN #1 ]
10: 1 Mult
11: 0 Offset
02: P59 BR Transform Rf[X/(1-X)]
01: 12 Reps
02: 1 Loc [:POTEN #1 ]
03: .1 Multiplier (Rf)
03: P55 Polynomial
01: 12 Reps
02: 1 X Loc POTEN #1
03: 1 F(X) Loc [:POTEN #1 ]
04: .15836 C0
05: 6.1445 C1
06: -8.4139 C2
07: 9.2493 C3
08: -3.1685 C4
09: .33392 C5
- INSTRUCTION MANUAL 1
- WARRANTY AND ASSISTANCE 3
- CR7 OPERATOR'S MANUAL 5
- TABLE OF CONTENTS 5
- OVERVIEW 5
- PROGRAMMING 6
- DATA RETRIEVAL/COMMUNICATION 6
- PROGRAMMING EXAMPLES 7
- INSTRUCTIONS 7
- INSTALLATION 8
- APPENDICES 8
- SELECTED OPERATING DETAILS 9
- CAUTIONARY NOTES 10
- OV1. PHYSICAL DESCRIPTION 11
- OV2. MEMORY AND PROGRAMMING 13
- CONCEPTS 13
- 720 I/O MODULE 14
- OV3. PROGRAMMING THE CR7 17
- OV4. PROGRAMMING EXAMPLE 19
- 32 give the 20
- , advance to next 21
- OV5. DATA RETRIEVAL OPTIONS 25
- 700X CONTROL MODULE 26
- OV6. SPECIFICATIONS 27
- SECTION 1. FUNCTIONAL MODES 29
- CLOCK - *5 MODE 30
- MEMORY OR FLAGS - *6 MODE 30
- 1.5 MEMORY ALLOCATION - *A 32
- STATUS - *B 33
- 1.7 *C MODE -- SECURITY 34
- 1.8 *D MODE -- SAVE OR LOAD 35
- ARRAYS, AND MEMORY POINTERS 39
- 2.2 DATA OUTPUT FORMAT AND 40
- RANGE LIMITS 40
- KEYBOARD/DISPLAY - *7 MODE 41
- 3.1 PARAMETER DATA TYPES 43
- 3.2 REPETITIONS/CARD NUMBER 43
- 3.4 INDEXING INPUT LOCATIONS 44
- 3.5 VOLTAGE RANGE AND 44
- OVERRANGE DETECTION 44
- 3.6 OUTPUT PROCESSING 44
- PROGRAM CONTROL 45
- 3.8 PROGRAM CONTROL LOGICAL 46
- CONSTRUCTIONS 46
- 3.9 INSTRUCTION MEMORY AND 48
- EXECUTION TIME 48
- 3.10 ERROR CODES 51
- 4.1 ON-LINE DATA TRANSFER 53
- INSTRUCTION 96, *4 MODE 53
- 4.2 MANUALLY INITIATED DATA 54
- OUTPUT - *9 MODE 54
- 4.3 STORAGE MODULE 55
- 4.4 PRINTER OUTPUT FORMATS 56
- 5.1 TELECOMMUNICATIONS 59
- COMMANDS 59
- 6.1 PIN DESCRIPTION 63
- SILICON PYRANOMETER 69
- 7.2 DIFFERENTIAL VOLTAGE 69
- MEASUREMENT 69
- USING 723-T REFERENCE 70
- USING AN EXTERNAL REFERENCE 70
- JUNCTION 70
- DIFFERENTIAL TEMPERATURE 71
- 7.5 THERMOCOUPLES FOR 71
- THERMOCOUPLES 72
- 7.7 107 TEMPERATURE PROBE 73
- 7.9 ANEMOMETER WITH 74
- PHOTOCHOPPER OUTPUT 74
- 7.10 TIPPING BUCKET RAINGAGE 74
- WITH LONG LEADS 74
- 7.14 PRESSURE TRANSDUCER - 4 78
- WIRE FULL BRIDGE 78
- 7.17 NONLINEAR THERMISTOR IN 82
- HALF BRIDGE (CAMPBELL 82
- SCIENTIFIC MODEL 101) 82
- 8.1 COMPUTATION OF RUNNING 83
- 8.2 RAINFALL INTENSITY 84
- SYNCHED TO REAL TIME 85
- 8.4 ANALOG OUTPUT TO STRIP 86
- 8.5 CONVERTING 0-360 WIND 87
- DIRECTION OUTPUT TO 0-540 FOR 87
- STRIP CHART 87
- Parameters 6 101
- SECTION 13. CR7 MEASUREMENTS 125
- LENGTH ON THE SIGNAL SETTLING 127
- /(R ( )) 129
- 13.4 THERMOCOUPLE 135
- MEASUREMENTS 135
- 13.5 BRIDGE RESISTANCE 139
- Excitation 141
- Measurement Sequence 141
- 13.6 RESISTANCE MEASUREMENTS 143
- REQUIRING AC EXCITATION 143
- MULTIPLE I/O MODULES 144
- SECTION 14. INSTALLATION 145
- AND OPTIONS 146
- 14.3 HUMIDITY EFFECTS AND 149
- 14.4 RECOMMENDED GROUNDING 149
- PRACTICES 149
- 14.5 USE OF DIGITAL CONTROL 150
- PORTS FOR SWITCHING RELAYS 150
- 15.1 I/O CARD IDENTIFICATION 151
- NUMBER DECODING 151
- APPENDIX A. GLOSSARY 159
- This is a blank page 162
- WITH STANDARD SOFTWARE 163
- C.1 TELECOMMUNICATIONS 165
- COMMAND WITH BINARY 165
- RESPONSES 165
- C.2 FINAL STORAGE FORMAT 167
- D.1 VOLTAGE REFERENCE 171
- CALIBRATION PROCEDURE 171
- D.2 CLOCK CALIBRATION 172
- PROCEDURE 172
- FIGURE D.2-2. CR7X CPU Card 174
- LIST OF TABLES 175
- LIST OF FIGURES 177
- 13. CR7 MEASUREMENTS 178
- 14. INSTALLATION 178
- CR7 INDEX 179
- CR7 INDEX 186
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