Campbell CR800 Specifications Page 152
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Section 6. Data Table Declarations and Output Processing Instructions
6-34
The algorithm for σ(θu) is developed by noting (Figure 6.4-4) that
Cos U / s ; where
ii
(') '
Θ
Θ
Θ
Θ
iii
u
=
=
−
FIGURE 6.4-5. Standard Deviation of Direction
The Taylor Series for the Cosine function, truncated after 2 terms is:
Cos ( ') ( ' ) /ΘΘ
ii
≅−12
2
For deviations less than 40 degrees, the error in this approximation is less than
1%. At deviations of 60 degrees, the error is 10%.
The speed sample may be expressed as the deviation about the mean speed,
ss'S
ii
=
+
Equating the two expressions for Cos (θ‘) and using the previous equation for
s
i
;
12
2
−=+(')/ /(' )Θ
iii
UsS
Solving for
(')Θ
i
2
, one obtains;
(') / (')'/ '/ΘΘ
iiiii
U S sS sS
22
22 2=− − +
Summing
(')Θ
i
2
over N samples and dividing by N yields the variance of Θu.
Note that the sum of the last term equals 0.
(( )) ( ')/ ( /) (( ') ')/
σ
ΘΘ ΘuNUSsNS
iii
i
N
i
N
22 2
11
21==−−
==
∑∑
s
i
Θ
'
i
Θ
u
U
i
U
- 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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