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CSAT3 Three Dimensional Sonic Anemometer
CSAT3 Three Dimensional
Sonic Anemometer
Revision: 11/07
C o p y r i g h t © 1 9 9 8 - 2 0 0 7
C a m p b e l l S c i e n t i f i c , I n c . Warranty and Assistance
The

CSAT3 THREE DIMENSIONAL SONIC ANEMOMETER is
warranted by CAMPBELL SCIENTIFIC, INC. to be free from defects in
materials and workmanship under normal use and service for twelve (12)
months from date of shipment unless specified otherwise. Batteries have no
warranty. CAMPBELL SCIENTIFIC, INC.'s obligation under this warranty is
limited to repairing or replacing (at CAMPBELL SCIENTIFIC, INC.'s option)
defective products. The customer shall assume all costs of removing,
reinstalling, and shipping defective products to CAMPBELL SCIENTIFIC,
INC. CAMPBELL SCIENTIFIC, INC. will return such products by surface
carrier prepaid. This warranty shall not apply to any CAMPBELL
SCIENTIFIC, INC. products which have been subjected to modification,
misuse, neglect, accidents of nature, or shipping damage. This warranty is in
lieu of all other warranties, expressed or implied, including warranties of
merchantability or fitness for a particular purpose. CAMPBELL SCIENTIFIC,
INC. is not liable for special, indirect, incidental, or consequential damages.
Products may not be returned without prior authorization. The following
contact information is for US and International customers residing in countries
served by Campbell Scientific, Inc. directly. Affiliate companies handle
repairs for customers within their territories. Please visit
www.campbellsci.com to determine which Campbell Scientific company
serves your country. To obtain a Returned Materials Authorization (RMA),
contact CAMPBELL SCIENTIFIC, INC., phone (435) 753-2342. After an
applications engineer determines the nature of the problem, an RMA number
will be issued. Please write this number clearly on the outside of the shipping
container. CAMPBELL SCIENTIFIC's shipping address is:


CAMPBELL SCIENTIFIC, INC.
RMA#_____

815 West 1800 North

Logan, Utah 84321-1784

CAMPBELL SCIENTIFIC, INC. does not accept collect calls.


CSAT3 Table of Contents
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1. General .........................................................................1
2. Specifications ..............................................................1
2.1 Measurements ...........................................................................................1
2.2 Output Signals ..........................................................................................2
2.3 Physical Description .................................................................................3
2.4 Power Requirements.................................................................................3
3. Initial Setup ..................................................................3
3.1 Factory Settings ........................................................................................3
3.2 SDM Address ...........................................................................................4
4. Installation....................................................................5
4.1 Orientation ................................................................................................5
4.2 Mounting ..................................................................................................5
4.3 Leveling ....................................................................................................7
4.4 Fine Wire Thermocouple..........................................................................7
5. Wiring............................................................................7
6. CSAT3 Outputs ..........................................................10
6.1 SDM Output ...........................................................................................10
6.1.1 CRBasic Dataloggers ....................................................................11
6.1.2 EDLOG Dataloggers.....................................................................11
6.1.3 CR9000 .........................................................................................11
6.2 RS-232 Output........................................................................................12
6.3 Analog Output ........................................................................................12
7. Operational Principles...............................................12
7.1 Embedded Code Version 4 .....................................................................12
7.2 Embedded Code Version 3 .....................................................................13
7.3 Effects of Crosswind on the Speed of Sound .........................................14
8. CSAT3 Trigger............................................................15
8.1 Sampling Modes .....................................................................................16
8.1.1 Single-Measurement Mode ...........................................................17
8.1.2 Oversample Mode.........................................................................17
9. Data Pipeline Delay....................................................17
i CSAT3 Table of Contents
10. Datalogger Programming using SDM ....................18
10.1 CRBasic CSAT3 () Instruction ............................................................ 18
10.2 EDLOG SDM-CSAT3 (P107) Instruction........................................... 18
10.3 Datalogger Instruction Parameters....................................................... 18
10.4 Diagnostic Word .................................................................................. 21
10.5 SDMTrigger ()/SDM-Group Trigger (P110) ....................................... 22
10.6 Example CRBasic Datalogger Program............................................... 23
10.7 Example EDLOG Datalogger Program ............................................... 27
11. Maintenance .............................................................37
11.1 Wicks ................................................................................................... 37
11.2 Calibration............................................................................................ 38
11.2.1 Cold Shifted Calibration............................................................. 39
11.2.2 Test for Wind Offset .................................................................. 39
12. Select Backdoor Commands ..................................41
Appendices
A. CSAT3 Orientation .................................................. A-1
A.1 Determining True North and Sensor Orientation................................ A-1
A.2 Online Magnetic Declination Calculator............................................. A-3
B. Serial Communications with the CSAT3 ............... B-1
B.1 CSAT3 RS-232 Commands ................................................................ B-1
B.2 CSAT3 Binary Data Output Format.................................................... B-3
B.3 Words 0 through 3............................................................................... B-4
B.4 Word 4................................................................................................. B-5
B.5 CSAT3 RS-232 Status Format ............................................................ B-5
C. CSAT3 Measurement Theory..................................C-1
C.1 Theory of Operation ............................................................................ C-1
C.1.1 Wind Speed ............................................................................... C-1
C.1.2 Temperature............................................................................... C-1
D. SDM Communications and Long Signal Cables...D-1
D.1 Brief Description of SDM Clock Rates............................................... D-1
D.2 CR3000 Example ................................................................................ D-2
D.3 CR23X Example ................................................................................. D-2
ii CSAT3 Table of Contents
Figures
1. CSAT3 Coordinate System and Captive Mounting Hardware ...................6
2. CSAT3 Coordinate System, and Captive Mounting Hardware and
Cup Washer ......................................................................................6
3. CSAT3 Coordinate System and Original Noncaptive Mounting
Hardware ..........................................................................................7
4. Typical Average CSAT3 Current Drain at +12 VDC...............................16
5. CSAT3 Pipeline Delay .............................................................................16
6. Proper Location of the Top and Bottom Wicks........................................38
7. CSAT3 running at 1 Hz and successfully communicating with the
CSAT3............................................................................................40
8. Recommended Settings for the Wind Vertical Axis.................................40
9. Recommended S