Campbell Scientific CSAT3 CSAT3 3-D Sonic Anemometer - Page 16

CSAT3 Three Dimensional Sonic Anemometer

FIGURE 4-4.

CSAT3 coordinate system and original noncaptive

mounting hardware (s/n 0107 to 0630)

4.3

Leveling

Over flat level terrain, adjust the anemometer head so that the bubble within

the level is in the bullseye.

Over sloping terrain, adjust the anemometer head

so that the horizontal surface that the bubble level is mounted on is parallel to

the terrain.

Firmly grasp the sonic anemometer block, loosen the bolt

underneath the block, and adjust the head accordingly.

Finally, tighten the bolt

with a 9/16” wrench.

4.4

Fine Wire Thermocouple

A fine wire thermocouple (model FW05 and FWC-L35) can be mounted to the

side of the anemometer block to measure temperature fluctuations.

Attach the

female connector from the FWC-L35 to the side of the anemometer with the

short screw (#2-56 0.437”, p/n 3514) that was provided with the thermocouple

cover.

Insert the male connector of the FW05 into the female connector of the

FWC-L35.

Finally, attach the thermocouple cover to the anemometer block,

using the thumb screw, so that both the FW05 and FWC-L35 connectors are

covered.

5.

Wiring

There are four military style connectors on the CSAT3 electronics box.

They

are labeled as +12V SDM, RS-232, Transducer Head, and Analog Output.

Connect the cable from the anemometer head to the electronics box labeled

Transducer Head.

The anemometer head cable is 2.13 m (7 ft) in length.

Each

of the signal cables is 7.62 m (25 ft) in length.

Connect the appropriate signal

cable to the electronics box.

See the TABLE 5-1 through TABLE 5-8 for

details on the wire color scheme.

8

Section	Page
Revision and Copyright Information	1
Warranty	3
Assistance	4
Table of Contents	5
1. General	9
2. Specifications	9
2.1 Measurements	9
2.2 Output Signals	10
2.3 Physical Description	11
2.4 Power Requirements	12
3. Initial Setup	12
3.1 Factory Settings	12
3.2 DM Address	13
4. Installation	13
4.1 Orientation	13
4.2 Mounting	14
4.3 Leveling	16
4.4 Fine Wire Thermocouple	16
5. Wiring	16
6. CSAT3 Outputs	19
6.1 SDM Output	19
6.1.1 CRBasic Dataloggers	20
6.1.2 EDLOG Dataloggers	20
6.1.3 CR9000	20
6.2 RS-232 Output	21
6.3 Analog Output	21
7. Operational Principles	21
7.1 Embedded Code Version 4	21
7.2 Embedded Code Version 3	22
7.3 Effects of Crosswind on the Speed of Sound	23
8. CSAT3 Trigger	24
8.1 Sampling Modes	25
8.1.1 Single-Measurement Mode	26
8.1.2 Oversample Mode	26
9. Data Pipeline Delay	26
10. Datalogger Programming using SDM	27
10.1 CRBasic CSAT3 () Instruction	27
10.2 EDLOG SDM-CSAT3 (P107) Instruction	27
10.3 Datalogger Instruction Parameters	27
10.4 Diagnostic Word	30
10.5 SDMTrigger ()/SDM-Group Trigger (P110)	31
10.6 Example CRBasic Datalogger Program	31
10.7 Example EDLOG Datalogger Program	36
11. Maintenance	45
11.1 Wicks	46
11.2 Calibration	47
11.2.1 Cold Shifted Calibration	47
11.2.2 Test for Wind Offset	48
12. Select Backdoor Commands	50
Appendix A. CSAT3 Orientation	53
A.1 Determining True North and Sensor Orientation	53
A.2 Online Magnetic Declination Calculator	55
Appendix B. Serial Communications with the CSAT3	57
B.1 CSAT3 RS-232 Commands	57
B.2 CSAT3 Binary Data Output Format	59
B.3 Words 0 through 3	60
B.4 Word 4	61
B.5 CSAT3 RS-232 Status Format	61
Appendix C. CSAT3 Measurement Theory	63
C.1 Theory of Operation	63
C.1.1 Wind Speed	63
C.1.2 Temperature	63
Appendix D. SDM Communications and Long Signal Cables	67
D.1 Brief Description of SDM Clock Rates	67
D.2 CR3000 Example	68
D.3 CR23X Example	68

Campbell Scientific CSAT3 CSAT3 3-D Sonic Anemometer - Page 16

Wiring

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