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Section 6. Data Table Declarations and Output Processing Instructions
6-29
When used with polar sensors, the instruction does a modulo divide by 360 on
wind direction, which allows the wind direction (in degrees) to be 0 to 360, 0
to 540, less than 0, or greater than 540. The ability to handle a negative
reading is useful where a difficult to reach wind vane is improperly oriented.
For example, a vane outputs 0 degrees at a true reading of 340 degrees. The
simplest solution is to enter an offset of -20 in the instruction measuring the
wind vane, which results in 0 to 360 degrees following the modulo divide.
When a wind speed sample is 0, the instruction uses 0 to process scalar or
resultant vector wind speed and standard deviation, but the sample is not used
in the computation of wind direction. The user may not want a sample less
than the sensor threshold used in the standard deviation. If this is the case,
Write the datalogger program to check wind speed, and if it is less than the
threshold set the wind speed variable equal to 0 prior to calling the data table.
Standard deviation can be processed one of two ways: 1) using every sample
taken during the output period (enter 0 for the Subinterval parameter), or 2)
by averaging standard deviations processed from shorter sub-intervals of the
output period. Averaging sub-interval standard deviations minimizes the
effects of meander under light wind conditions, and it provides more complete
information for periods of transition
1
.
Standard deviation of horizontal wind fluctuations from sub-intervals is
calculated as follows:
σ(Θ)=[((σΘ
1
)
2
+(σΘ
2
)
2
...+( σΘ
M
)
2
)/M]
1/2
where σ(Θ) is the standard deviation over the output interval, and σΘ
1
... σΘ
M
are sub-interval standard deviations.
A sub-interval is specified as a number of scans. The number of scans for a
sub-interval is given by:
Desired sub-interval (secs) / scan rate (secs)
For example if the scan rate is 1 second and the Data Interval is 60 minutes, the
standard deviation is calculated from all 3600 scans when the sub-interval is 0.
With a sub-interval of 900 scans (15 minutes) the standard deviation is the
average of the four sub-interval standard deviations. The last sub-interval is
weighted if it does not contain the specified number of scans.
Measured raw data:
S
i
= horizontal wind speed
Θ
i
= horizontal wind direction
Ue
i
= east-west component of wind
Un
i
= north-south component of wind
N = number of samples
1
EPA On-site Meteorological Program Guidance for Regulatory Modeling
Applications.
- CR5000 Measurement and 1
- Control System 1
- Warranty and Assistance 2
- TABLE OF CONTENTS 3
- APPENDIX 4
- CR5000 MICROLOGGER 6
- OV2.1 Memory 9
- OV2.3 Data Tables 10
- OV3.2 PC9000 Installation 10
- OV3.3.1 File 13
- OV3.3.2 Edit 13
- OV4. Keyboard Display 15
- OV4.1 Data Display 16
- OV4.1.1 Real Time Tables 17
- CR5000 Overview 18
- OV4.2 Run/Stop Program 20
- OV4.3 File Display 21
- OV4.3.1 File: Edit 22
- OV4.4 Configure Display 23
- OV5. Specifications 24
- 1.2 Power Requirements 25
- 1.3 CR5000 Power Supplies 26
- 1.4 Solar Panels 28
- BOOST REGULATOR 29
- 1.7 CR5000 GROUNDING 30
- CR5000 ICROLOGGER 31
- 1.10 Maintenance 36
- BATTERY2 38
- (datalogger/cr5000) 38
- 2.1 Data Storage in CR5000 41
- 2.2 Internal Data Format 42
- 2.3 Data Collection 43
- 2.3.1.1 File Type 44
- 2.3.1.2 Collection Method 44
- 2.3.1.3 Table Selection 45
- 2.3.1.4 File Control 45
- 2.3.2 RealTime Write File 46
- 2.3.3 Logger Files Retrieve 47
- 2.3.4 Via PCMCIA PC Card 47
- 2.4 Data Format on Computer 50
- 2.4.2 TOA5 ASCII File Format 51
- 3.1.1 Voltage Range 55
- 3.1.4 SettlingTime 57
- 3.1.5 Integration 57
- Measurements 58
- 3.3 Signal Settling Time 59
- 3.4.1 Error Analysis 62
- Thermocouple Limits of Error 65
- Noise on Voltage Measurement 67
- Error Summary 69
- CR5000 Junction Box 70
- 3.7 Pulse Count Measurements 74
- 3.8 Self Calibration 75
- 4.1 Format Introduction 77
- 4.2 Programming Sequence 78
- 4.3 Example Program 80
- CallTable Temp 82
- 4.4 Numerical Entries 83
- 4.6 Flags 84
- 4.7 Parameter Types 85
- 'Calibration factors: 86
- Station Name 91
- Sub, Exit Sub, End Sub 91
- Subroutine Example 93
- 6.1 Data Table Declaration 95
- 6.2 Trigger Modifiers 96
- OpenInterval 97
- FillStop 99
- 6.3 Export Data Instructions 102
- TableOption 103
- BufferControl 103
- Highlimit, MinAmp, Form) 118
- Code Form 119
- Constant 119
- Measured raw data: 123
- 7.8 Digital I/O 128
- 7.9 Peripheral Devices 128
- 7.1 Voltage Measurements 129
- Integ, Mult, Offset) 130
- 7.3 Half Bridges 131
- 7.4 Full Bridges 134
- 7.5 Current Excitation 137
- 7.7 Self Measurements 141
- Calibrate (Dest, AllRanges) 142
- ± 10 mV) and resolution 146
- Silicon diodes 146
- . Resistor 146
- PortGet (Dest, Port) 147
- PortSet (Port, State) 148
- Pulse Channel 149
- PulseCountReset 151
- ReadIO (Dest, Mask) 151
- TimerIO 153
- WriteIO (Mask, Source) 154
- SDMAddress 156
- SEG TSEG q22 158
- Parameter 160
- & Data Type 160
- Description 165
- Result 167
- SDMSpeed (BitPeriod) 168
- SDMTrigger 168
- ValuesPerRep 170
- This is a blank page 172
- Instructions 173
- ACOS (Source) 174
- ASIN (Source) 175
- ATN (Source) 176
- AvgSpa (Dest, Swath, Source) 177
- Cos (Source) 179
- CosH (Source) 179
- Variable or 180
- Frac (Source) 183
- Int, Fix 186
- Log (Source) 187
- LOG10 (number) 187
- MemoryTest 188
- MaxSpa (Dest, Swath, Source) 188
- MinSpa (Dest, Swath, Source) 189
- Move (Dest, Swath, Source) 190
- Randomize 194
- RealTime 195
- RectPolar (Dest, Source) 196
- RMSSpa (Dest, Swath, Source) 197
- RND (Source) 197
- Sgn (Source) 201
- Sin (Source) 201
- SinH (Source) 202
- Sqr (Source) 202
- StdDevSpa 203
- Tan (Source) 203
- TANH (Source) 204
- Derived Math Functions 205
- Section 9. Program Control 207
- CallTable 208
- Data, Read, Restore 209
- ClockSet 209
- Delay (Option, Delay, Units) 210
- FileManage 212
- FileMark (TableName) 213
- For ... Next Statement 213
- Power Off 217
- RunDLDFile 218
- Reset Table 219
- Select Case Statement 221
- Slow Sequence 223
- While…Wend 227
- This is a blank 236
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