Campbell CR800 Specifications Page 211
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Section 8. Processing and Math Instructions
Parameter
& Data Type
Enter
Dest
Variable or
Array
The Variable in which to store the results of the instruction. When multiple covariances are
calculated, the results are stored in an array with the variable name. An array must be
dimensioned to at least the value of NumOfCov.
NumOfCov
Constant
The number of covariances to be calculated. If four data sets are to be compared against a
fifth set, this would be set to four.
SizeOfSets
Constant
The number of values in the data sets for the covariance calculations.
CoreArray
Array
The array that holds the core data set. The covariance of core data with each of the other sets
is calculated independently. The data need to be consecutive in the array. If the first data
value is not the first point of the array, the first point of the data set must be specified in this
parameter.
DatArray
Array
The array that contains the data set(s) for calculating the covariance with the CoreSet. When
multiple covariances are calculated, the data sets have to be loaded consecutively into one
array. The array must be dimensioned to at least the value of NumOfCov multiplied by
SizeOfSets. For example, if each set of data has 100 elements (SizeOfSets), and there are 4
covariances (NumOfCov) to be calculated, then the DatArray needs to be dimensioned to 4 x
100 = 400. If the first value of the first set is not the first point of the array, the first point of
the data set must be specified in this parameter.
DewPoint (Dest, Temp, RH)
Parameter
& Data Type
Enter
Dest
Variable
The variable in which to store the dew point temperature (°C).
Temp
Variable
The variable that contains air temperature (°C).
RH
The variable that contains RH (%).
The dew point instruction calculates the dew point temperature from
previously measured values of RH and air temperature. While end results may
not be quite as accurate as those from a dedicated dew point sensor, they are
acceptable for a wide range of applications.
Calculating Dew Point
Measure the relative humidity (RH) and air temperature (T
a
; units °C) with the
appropriate instruction for the sensors you are using.
Dew point temperature is calculated as follows:
1. The saturation vapor pressure (S
vp
; units kPa) is calculated using Lowe’s
equation (see SatVP).
2. The vapor pressure (V
p
; units kPa) is calculated from V
p
= RH ∗ S
vp
/
100).
3. The dew point (Td; units °C) is calculated from the inverse of a version of
Tetens’ equation, optimized for dewpoints in the range -35 to 50°C:
T
d
= (C
3
∗ ln(V
p
/ C
1
)) / (C
2
. ln(V
p
/ C
1
))
8-9
- CR800/CR850 Measurement 1
- Warranty and Assistance 2
- Appendix 7
- Figures 7
- OV1.1.8 Digital I/O (C1-4) 11
- OV1.1.9 Pulse Inputs (P1-2) 12
- OV1.1.10 Program Status 12
- OV1.2.1 CS I/O 12
- OV1.2.2 Computer RS-232 13
- OV2.1 Memory 14
- OV2.2 Programming 14
- OV2.3.1 Pipeline Mode 15
- OV2.3.2 Sequential Mode 15
- OV2.3.3 Slow Sequence Scans 16
- OV2.3.4 Task Priority 16
- OV2.4 Data Tables 17
- OV2.5 PakBus 17
- OV3. Device Configurator 18
- OV3.1 Main DevConfig Screen 19
- OV3.2 Deployment Tab 20
- OV3.2.2 Ports Settings 21
- OV3.2.3 Advanced 23
- OV3.3 Logger Control Tab 24
- OV3.5 Settings Editor Tab 26
- OV3.6 Terminal Tab 27
- OV4. Quick Start Tutorial 28
- OV4.4 PC200W Software 30
- OV4.4.4 Send the Program 35
- OV4.4.5 Monitor Data Tables 35
- OV4.4.6 Collect Data 36
- OV4.4.7 View Data 37
- OV5. Keyboard Display 39
- CR1000KD or CR850 Display 40
- OV5.1 Data Display 41
- CR800 and CR850 Overview 42
- 1.2 Power Requirements 53
- 12V ALKALINE BATTERY PACK 55
- 1.4 Solar Panels 58
- 1.7 CR800 Grounding 59
- 1.10 Maintenance 63
- 1.10.1 Desiccant 64
- 2.1 Data Storage in CR800 69
- 2.2 Internal Data Format 69
- 2.3 Data Collection 70
- 2.4 Data Format on Computer 70
- 3.1.1 Voltage Range 75
- 3.1.4 SettlingTime 77
- Measurements 78
- 3.3 Signal Settling Time 80
- Settling Time 82
- 3.4.1 Error Analysis 83
- Time Minutes 85
- Measured - Actual degrees C 85
- Thermocouple Limits of Error 86
- ± 0.5% Not Estab 86
- Noise on Voltage Measurement 88
- Error Summary 89
- can be minimized by making 90
- CR800 Junction Box 91
- 3.8 Self Calibration 95
- °C) the 96
- °C out into a 96
- Programming 97
- 4.2 Programming Sequence 98
- 4.3 Example Program 100
- CallTable Temp 102
- 4.4 Variable Data Types 103
- 4.5 Numerical Entries 105
- 4.6.1 What is True? 106
- 4.6.2 Expression Evaluation 106
- 4.7 Flags 107
- 4.8 Parameter Types 107
- AngleDegrees 111
- AS type 112
- PipelineMode 114
- SequentialMode 115
- Station Name 115
- Sub, Exit Sub, End Sub 116
- 6.1 Data Table Declaration 119
- 6.2 Trigger Modifiers 120
- OpenInterval 121
- FillStop 123
- DSP4 (FlagVar, Rate) 126
- BufferControl 127
- Remarks 128
- StatusCommand 129
- Highlimit, MinAmp, Form) 144
- Measured raw data: 150
- Calculations: 150
- ΘΘ ΘuNUSsNS 152
- ()(( /)) ( /) 153
- ΘuUS US=− =−21 811 153
- This is a blank page 154
- 7.8 Specific Sensors 156
- 7.9 Peripheral Devices 156
- 7.1 Voltage Measurements 157
- Integ, Mult, Offset) 158
- 7.4 Full Bridges 162
- 7.5 Excitation 164
- 7.6 Self Measurements 165
- Calibrate (Dest, AllRanges) 166
- 7.7 Digital I/O 169
- Timeout, Mult, Offset) 170
- ± 10 mV) and resolution (1.2 171
- Silicon diodes 171
- PortsConfig (Mask, Function) 172
- PortGet (Dest, Port) 172
- PortSet (Port, State) 173
- Constant 174
- ReadIO (Dest, Mask) 176
- Offset) 176
- WriteIO (Mask, Source) 177
- SlowAntenna 179
- Variable 180
- SettlingTime 181
- SDMAddress 184
- TimeQuanta t 185
- SDMSpeed (BitPeriod) 199
- SDMTrigger 199
- SDMX50 (SDMAddress, Channel) 200
- Mult, Offset) 201
- Instructions 203
- ACOS (Source) 204
- ASIN (Source) 206
- ATN (Source) 206
- AvgSpa (Dest, Swath, Source) 208
- Cos (Source) 209
- CosH (Source) 210
- FirstSetStart) 210
- DewPoint (Dest, Temp, RH) 211
- Exp (Numeric Expression) 213
- Frac (Source) 215
- Int, Fix 218
- Ln (Source) 219
- Log (Source) 219
- LOG10 (number) 219
- MaxSpa (Dest, Swath, Source) 220
- MinSpa (Dest, Swath, Source) 220
- Randomize (Number) 227
- RealTime 227
- RectPolar (Dest, Source) 228
- RMSSpa (Dest, Swath, Source) 229
- RND (Source) 229
- SatVP (Dest, Temp) 230
- Sgn (Number) 233
- Sin (Angle) 233
- SinH (Expression) 234
- Sqr (Number) 234
- Tan (Source) 235
- TANH (Source) 236
- Derived Math Functions 239
- Section 9. Program Control 241
- CallTable 242
- Data … Read … Restore 243
- ClockSet (Source) 244
- Delay (Option, Delay, Units) 244
- Do … Loop 245
- FileManage 246
- FileMark (TableName) 247
- For ... Next 247
- RunProgram 251
- ResetTable 252
- Scan … NextScan 252
- SelectCase … EndSelect 253
- Slow Sequence 257
- Timer (TimNo, Units, TimOpt) 259
- WaitDigTrig (Port, Edge) 260
- While…Wend 261
- DisplayMenu/EndMenu 264
- 11.1.1 Constant Strings 267
- 11.1.2 Add Strings 267
- Processing Instructions 268
- LowerCase (SourceString) 269
- StrComp (String1, String2) 270
- UpperCase (SourceString) 270
- Functions 271
- DialVoice (DialString) 272
- BooleanVariable) 273
- SerialClose (ComPort) 274
- SerialFlush (ComPort) 275
- ClockReport 280
- PakBusClock (PakBusAddr) 280
- Routes (Dest) 280
- GetSwath) 281
- TimeOut, Settings) 282
- TimeUntilTransmit 283
- 14.2.2 PakBus Address Setup 291
- 14.2.4 Router Setup 293
- 14.2.5.2 Baud Rates 294
- 14.3 PakBus Concepts 295
- 14.3.2 PakBus Devices 296
- 14.3.3 Neighbor Discovery 296
- 14.3.4 Neighbor Removal 297
- 14.3.6 Routers 298
- 14.3.8 Leaf-Nodes 302
- ComPort_2 303
- PakBusPort 303
- 14.4 Settings Editors 304
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