Vaisala WINDCAP WS425 Podręcznik Użytkownika Strona 39
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Chapter 3 _______________________________________________________ Functional Description
The microcontroller calculates WS from the measured transit
times using the following formula:
)
t
/1
(1/t
L5
.0
V
r
f
W
−⋅
⋅=
where
V
w
=
Wind velocity
L
=
Distance between two transducers
t
f
=
Transit time in the forward direction
t
r
=
Transit time in the reverse direction
Measuring the six transit times allows V
w
to be computed for each
of the three ultrasonic paths. Using V
w
values of two array paths
is enough to compute WS and WD.
Figure 12 below shows the different paths of WMT700 and the
vectors provided by the wind sensor:
1104-066
Figure 12 Measurement Paths of WMT700
where
1–6
=
Measurement paths 1 to 6 of WMT700
L
a
, L
b
, L
c
=
Distance between two transducers
VAISALA ________________________________________________________________________ 37
- Planning Guide 0
- Configuring call direction 5
- Glossary 9
- SWD-1000192-0414013325-001 11
- Provide feedback 12
- Legal notice 13
- Contents 16
- Overview 17
- Requirements 18
- System requirements: PBX 21
- Welcome to Verizon Wireless 23
- The Basics 24
- (see page 18) 38
- THE BASICS 40
- Assistance 41
- Mobile Entertainment 53
- Optional Services 84
- More Information 91
- MORE INFORMATION 110
- USER'S GUIDE 120
- WARNING 122
- Using Standard WMT700 Cables 123
- WS425 Analog Output Signals 128
- OPERATION 131
- List of Tables 132
- Configuration 135
- Parameter Handling Commands 136
- S — Set Parameter 137
- G — Get Parameter 138
- Set Port Settings 139
- Display Port Settings 139
- START — Start Continuous 140
- Measurement 140
- STOP — Stop Wind Measurement 140
- ERRORS — Get Error Codes and 141
- Information Commands 142
- Configuration Parameters 144
- Configuring Data Messages 145
- Data Messages 146
- Status Flags 149
- Operating WMT700 152
- GENERAL INFORMATION 154
- WMT700 Data Message 21 156
- WMT700 Data Message 22 156
- WMT700 Data Message 23 157
- WMT700 Data Message 24 158
- WMT700 Data Message 25 159
- Missing Readings 160
- Error Indication 161
- Measurement Mode Commands 162
- MEAS — Start Measurement 163
- POLL — Poll Data 164
- SLEEP — Enter Low-Power Mode 164
- Version Information 165
- Related Manuals 165
- @a M 12<CR><LF> 166
- Output Mode 167
- Output Operation Mode 168
- Wind Speed Output 169
- Voltage 170
- Wind Direction Output 171
- S aout1minv,0.1 172
- S aout1maxv,5 172
- S aout1err,1 172
- Profiles 173
- Communication Profiles 173
- Entering Configuration Mode 175
- Documentation Conventions 176
- WS425 F/G ASOS Profile 177
- WS425 F/G ASOS Commands 178
- Direction 179
- WS425 F/G ASOS Data Message 181
- WAP2131870503012.6014.7K99xx 182
- Configurable Parameters 183
- WS425 A/B NMEA Standard Data 184
- Message 184
- WS425 A/B NMEA Extended 186
- Commands 186
- Recycling 187
- WS425 A/B NMEA Extended Data 188
- WS425 A/B ASCII Profile 189
- WS425 A/B ASCII Commands 190
- WS425 A/B WAT11 Profile 193
- SDI-12 Profile (v 1.3) 195
- SDI-12 Commands 197
- Regulatory Compliances 198
- ?! — Address Query 199
- SDI-12 Data Messages 207
- Trademarks 209
- Warranty 209
- MAINTENANCE 211
- Periodic Maintenance 212
- Visual Inspection 212
- Cleaning 212
- Testing Proper Operation 213
- 1005-003 214
- TROUBLESHOOTING 215
- Error and Event Messages 217
- PRODUCT OVERVIEW 220
- Technical Support 221
- Product Returns 221
- TECHNICAL DATA 222
- Table 62 Accessories 225
- Dimensions 226
- 1103-055 227
- COMPLETE COMMAND SET FOR 228
- TYPICAL SYSTEM ENVIRONMENTS 230
- 1003-005 232
- 1003-052 233
- 1003-053 234
- 1004-001 235
- DEFAULT SETTINGS FOR 236
- DIFFERENT COMMUNICATION 236
- PROFILES 236
- CONFIGURATION PARAMETERS 240
- 1104-065 243
- WMT700 NMEA MWV PROFILE 245
- WMT700 NMEA MWV Commands 247
- WMT700 NMEA MWV Data Message 248
- ACCESSORIES 249
- 1304-061 250
- CERTIFICATES 253
- 1104-064 254
- *M211095EN* 256
- 1305-001 257
- 1305-002 257
- 1305-003 258
- 1305-004 258
- Ordering Options 259
- Heating 260
- Digital Communication Units 261
- Channel 263
- Connection Cables 263
- Table of Contents 264
- Mounting Adapters 265
- Accessories 265
- Bird Cage 268
- WM Verifier 269
- Table 17 Cables 270
- Cable Tightening Tool 271
- FUNCTIONAL DESCRIPTION 272
- 1005-007 273
- 1104-066 274
- CHAPTER 4 275
- Calculations 276
- 0212-044 277
- Scalar Averaging 278
- Vector Averaging 279
- Measurement Methods 280
- Serial Communication 283
- Protocols 285
- CHAPTER 5 286
- 1001-111 287
- Serial Interface Timing 288
- Analog Output 289
- Figure 18 Frequency Output 290
- Analog Output Scaling 291
- Missing Readings and Error 294
- Indication 294
- INSTALLATION 296
- 1001-016 299
- Installation Procedure 302
- Mounting 303
- 1306-029 304
- 1306-140 305
- 1006-077 306
- 1006-078 307
- 1006-079 310
- 1006-080 311
- 1306-033 312
- 1103-054 313
- Alignment 315
- Installing Bird Cage 316
- 1104-086 317
- APPENDIX E 319
- APPENDIX F 319
- APPENDIX G 319
- 1009-016 321
- Connector Signals 323
- Heated Transducers and Arms 325
- Powering 326
- 1301-017 327
- 1104-054 328
- 1104-055 328
- Heating Power 329
- List of Figures 330
- CAUTION 331
- 1104-081 334
- 1104-082 335
- 1104-083 336
- Before You Start 337
- Mounting Procedure 339
- Tightening Connector 340
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