Vaisala WMT52 Manuel d'utilisateur Page 137
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Appendix D ________________________________________ Wind Measurement Averaging Method
VAISALA______________________________________________________________________ 135
APPENDIX D
WIND MEASUREMENT AVERAGING
METHOD
The following three figures represent the wind measurement averaging
for different selections of communication protocol, wind measurement
update interval (I) and averaging time (A). Scalar averaging is used for
both wind speed and direction.
NOTE
Grey boxes indicate that the measurement is in progress during the
corresponding second.
Update (= internal calculation) is always made in the end of the update
interval.
In the auto sending protocols (ASCII automatic (+ CRC) and NMEA
automatic) outputting the data messages is synchronized to take place
immediately after the update.
In ASCII polled (+ CRC), NMEA query and SDI-12 continuous
measurement protocols trying to request data before the update
interval is completed will result in getting the data from the previous
completed update interval.
Wind measurement sampling rate (4, 2, or 1 Hz) does not have any
effect on the averaging scheme. It determines from how many samples
the one second values seen in the figures are calculated.
- USER'S GUIDE 1
- Table of Contents 3
- CHAPTER 5 4
- CHAPTER 6 4
- CHAPTER 7 4
- CHAPTER 8 5
- CHAPTER 9 5
- CHAPTER 10 5
- CHAPTER 11 5
- APPENDIX A 6
- APPENDIX B 6
- APPENDIX C 6
- APPENDIX D 6
- APPENDIX E 6
- List of Figures 7
- List of Tables 9
- GENERAL INFORMATION 11
- General Safety Considerations 12
- Feedback 13
- ESD Protection 13
- Recycling 13
- Trademarks 14
- License Agreement 14
- Regulatory Compliance 14
- Warranty 15
- PRODUCT OVERVIEW 17
- Heating Function 18
- 0803-041 19
- 0803-029 20
- 0804-007 22
- FUNCTIONAL DESCRIPTION 25
- 0.5 L 1 t 26
- Heating (Optional) 27
- INSTALLATION 29
- Selecting the Location 30
- 0806-005 31
- 0803-043 33
- 0803-044 35
- 0803-042 35
- Marine Grounding Jumper 37
- Aligning the WMT52 38
- Wind Direction Offset 39
- WIRING AND POWER MANAGEMENT 41
- Heating Voltage 42
- External Wiring 44
- Internal Wiring 45
- 0803-035 46
- Data Communication Interfaces 48
- Power Management 49
- CONNECTION OPTIONS 53
- Connection cables 54
- Service Cable Connection 56
- Connector or Screw Terminal 57
- Checking the Current 58
- Communication Settings (aXU) 58
- Changing the Communication 61
- Settings (aXU) 61
- GETTING THE DATA MESSAGES 63
- General Commands 64
- Reset (aXZ) 64
- Measurement Reset (aXZM) 65
- ASCII Protocol 66
- Abbreviations and Units 66
- Device Address (?) 66
- Wind Data Message (aR1) 68
- Supervisor Data Message (aR5) 69
- Combined Data Message (aR) 70
- Composite Data Message Query 70
- Polling with CRC 71
- Automatic Mode 72
- Automatic Composite Data 73
- Message (aR0) 73
- SDI-12 Protocol 73
- Address Query Command (?) 74
- Change Address Command (aAb) 75
- CRC (aMC) 78
- CRC (aCC) 79
- Send Data Command (aD) 80
- Examples of aM, aC and aD 81
- Commands 81
- Continuous Measurement (aR) 82
- NMEA 0183 V3.0 Protocol 84
- MWV Wind Speed and Direction 85
- XDR Transducer Measurement 87
- B = 11, a = 36, b = 37 etc.) 88
- TXT Text Transmission 93
- SENSOR AND DATA MESSAGE 97
- SETTINGS 97
- Wind Direction 100
- Changing the Settings (aWU) 101
- Supervisor Message 103
- Checking the Settings (aSU) 103
- Setting Fields 104
- Changing the Settings (aSU) 105
- Composite Data Message (aR0) 106
- MAINTENANCE 109
- Vaisala Service Centers 110
- TROUBLESHOOTING 111
- Self-Diagnostics 113
- Error Messaging/Text Messages 113
- Wind Sensor Heating Control 115
- Operating Voltage Control 115
- Technical Support 115
- TECHNICAL SPECIFICATIONS 117
- Table 13 Inputs and Outputs 118
- Table 14 Operating Conditions 118
- Table 16 Materials 119
- Table 17 General 119
- Options and Accessories 120
- Dimensions 121
- 0505-211 122
- Communication Protocol 124
- RS-485 Serial Interface 124
- ASCII, Polled 125
- NMEA 0183 v3.0, Query 126
- Query Commands 128
- SDI-12 PROTOCOL 131
- SDI-12 Timing 133
- CRC-16 COMPUTATION 135
- WIND MEASUREMENT AVERAGING 137
- 0710-044 138
- General Unit Settings 140
- Wind Configuration Settings 140
- Supervisor Settings 141
- *M210925EN* 143
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