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Summary of Contents for Campbell CSAT3
- Page 1 CSAT3 THREE DIMENSIONAL SONIC ANEMOMETER INSTRUCTION MANUAL REVISION: 3/98 COPYRIGHT (c) 1996-1998 CAMPBELL SCIENTIFIC, INC.
- Page 2 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.
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Page 3: Table Of Contents
CSAT3 THREE DIMENSIONAL SONIC ANEMOMETER INSTRUCTION MANUAL TABLE OF CONTENTS PAGE GENERAL ............................ 1 SPECIFICATIONS ........................1 INITIAL SETUP .......................... 2 Factory Settings......................... 2 SDM Address ..........................2 INSTALLATION .......................... 3 Orientation ..........................3 Mounting............................ 3 Leveling ............................. 5 Fine Wire Thermocouple......................5 WIRING ............................ - Page 4 CSAT3 Coordinate System and Mounting Hardware ..............4 CSAT3 Sonic Anemometer, KH20 Krypton Hygrometer and FW05 Fine Wire Thermocouple................... 4 Typical Average CSAT3 Power Requirements at + 12 VDC ............. 9 CSAT3 Pipeline Delay ....................... 9 PC as the Trigger Source .......................B-2 CSAT3 as the Trigger Source ....................B-3...
- Page 5 TABLE OF CONTENTS Converting u Wind from Word 2....................B-4 Converting Speed of Sound from Word 3 ................B-4 Decoding the Diagnostic Flags from Word 4................B-4 Special Case - Not a Number....................B-4 RS-232 Status, Response to the S or P Command ...............B-5 Data from Example CR23X SDM Clock Rate Search Program ..........D-1 SDM Clock Rate Report ......................D-2...
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Page 6: General
1. GENERAL connectors. This cover is used to mount the The CSAT3 is a three dimensional sonic connectors to the side of the CSAT3 head and anemometer. It measures wind speed and the minimized temperature gradient across the speed of sound on three nonorthogonal axes. -
Page 7: Initial Setup
RS-232 cable. MEASUREMENT PATH LENGTH: 10.0 cm vertical; 5.8 cm horizontal 3.2 SDM ADDRESS Each CSAT3 on the SDM bus must have a TRANSDUCER PATH ANGLE FROM unique address. A hex thumb switch within the HORIZONTAL: 60 degrees electronics box is used to change the SDM address. -
Page 8: Installation
See Section 3 of the Tripod Weather Station Installation manual for details and A krypton hygrometer can be mounted next to the recommendations on installing the tripod. CSAT3 on the same vertical pipe (see Figure 4-2). -
Page 9: Csat3 Coordinate System And Mounting Hardware
CSAT3 THREE DIMENSIONAL SONIC ANEMOMETER Logan, Utah CSAT3 10.00 cm 3-D SONIC ANEMOMETER S/N: 102 MADE IN USA FIGURE 4-1. CSAT3 Coordinate System and Mounting Hardware FIGURE 4-2. CSAT3 Sonic Anemometer, KH20 Krypton Hygrometer, and FW05 Fine Wire Thermocouple. -
Page 10: Leveling
Ground Black that the bubble level is mounted on, is parallel to the terrain. TABLE 5-2. CSAT3 SDM Output to a CR23X and CR10(X) Datalogger Firmly grasp the sonic anemometer block, loosen the bolt underneath the block, and adjust Channel... -
Page 11: Csat3 Outputs
Signal High Purple SDM communications between the CR9000 and Signal Low CSAT3 is achieved via the 9 pin CSI serial I/O port on the 9080 peripheral and memory card. The CR9000 instruction CSAT3() is used to 6. CSAT3 OUTPUTS communicate with the CR9000 over the SDM The CSAT3 has three signal outputs: SDM, bus. -
Page 12: Operational Principles
If the CSAT3 is set to use its between transducers but also by the current wind speed and speed of sound conditions. -
Page 13: Sampling Modes
This aliasing does not that under gusty conditions the wind speed compromise the variances and covariances could change to the extent that the CSAT3 sets (and therefore, fluxes) computed from aliased its search window to a point in time which data. -
Page 14: Data Pipeline Delay
CSAT3 THREE DIMENSIONAL SONIC ANEMOMETER FIGURE 8-1. Typical Average CSAT3 Power Requirements at +12 VDC Trigger Measure Times i + 1 i + 2 i + 3 Of Flight Process Data i - 1 i + 1 i + 2... -
Page 15: Datalogger Programming Using Sdm
Data” TABLE 10-1. SDM-CSAT3 (P107) Instruction sends a measurement trigger to the CSAT3 Parameters whose SDM address is specified in parameter 2. The CSAT3 also sends wind speed and the PARAMETER DATA DEFAULT sonic virtual temperature (defined in Equation NUMBER... -
Page 16: Diagnostic Word
CSAT3 THREE DIMENSIONAL SONIC ANEMOMETER TABLE 10-2. CR23X and 21X Execution Interval and CSAT3 Execution Parameter CR23X/21X Execution CR23X/21X Execution CSAT3 Execution Parameter Interval (seconds) Frequency (Hz) 0.05 0.0625 0.075 13.333 0.0875 to 0.1 11.429 to 10 0.1125 to 0.1625 8.889 to 6.154... -
Page 17: Sdm-Group Trigger (P110)
With the SDM Group Trigger (P110), all bring the anemometer back on-line, connect the group trigger devices are triggered to make CSAT3 to the SDM bus and execute the SDM- simultaneous measurements. The data from CSAT3 (P107) instruction with the “Set each device is then retrieved with the Execution Parameter”... -
Page 18: Maintenance
SDM Output and a CR23X Datalogger ;signal or making measurements, e.g. ;diag <> 61503. ;{CR23X} 05: If (X<=>F) (P89) X Loc [ diag ;Flag 1 - Set low to configure the CSAT3. <> 3: 61503 *Table 1 Program Then Do Execution Interval (seconds) 06: Do (P86) ;Get the data from the CSAT3. -
Page 19: Calibration
(435) 752-3268, to obtain an RMA number. 12. CALIBRATION The CSAT3 is calibrated over the temperature range of -30° to +50°C. The CSAT3 will not operate outside that temperature range. Contact Campbell Scientific if the CSAT3 will be operated in an environment where temperature is outside the range of -30°... -
Page 20: Example Flux Program
Table 2 to examine energy balance closure. Connect all the sensors to the CR23X and power to the CSAT3 and the KH20. Download the program to the CR23X. Verify that all the sensors are reading correctly by checking the data in Input Locations 1 through 20. -
Page 21: Cr23X Sensor Connections
Clear HFT3#1 Black HFT3#1 White HFT3#1 Clear HFT3#2 Black HFT3#2 White HFT3#2 Clear TCAV Purple TCAV TCAV Clear CSAT3 Green CSAT3 White CSAT3 Brown HMP45C Orange CS615 Orange +12 V CSAT3 CSAT3 Black/Clear +12 V HMP45C +12 V CS615 HMP45C... -
Page 22: Serial Communications With The Csat3
B.1 CSAT3 RS-232 COMMANDS The CSAT3 powers up its RS-232 drivers when it detects that the RTS (request to send) line has been asserted by the PC. All RS-232 communications begin with the PC asserting the RTS line. The CSAT3 responds by asserting the CTS (clear to send) line. -
Page 23: Pc As The Trigger Source
1 The CSAT3 will ignore this command if a datalogger (SDM) is triggering the anemometer. 2 After the PC takes over as the trigger source it must continue to trigger the CSAT3 at the rate specified in the Execution Parameter (An). If the CSAT3 does not receive a trigger for three seconds it will enter the Lost Trigger state. -
Page 24: Csat3 Binary Data Output Format
B.2 CSAT3 BINARY DATA OUTPUT FORMAT Five words are sent by the CSAT3's RS232 output. Words 0 through 3 are 16 bit signed integers and word 4 is 16 bit unsigned integer. The five words are sent starting with word 0 and ending with word 4. - Page 25 (m s The speed of sound reported by the CSAT3 is the average between the three sonic paths. The relationship to find the speed of sound is given in Table B-6. Word 3 must be converted to a base 10 representation before applying the equation.
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Page 26: Csat3 Rs-232 Status Format
B.5 CSAT3 RS-232 STATUS FORMAT The CSAT3 returns a 10 ASCII byte status in response to an S or P command. This status provides information on the CSAT3’s Trigger Source and the Execution Parameter. It also indicates if the analog outputs are on/off, if the CSAT3 is reporting good data, and serial number of the CSAT3. -
Page 27: Csat3 Measurement Theory
Substitute Eq. (7a) and (7b) into (6) and ignore where A is a 3 x 3 coordinate transformation the higher order terms. This yields matrix, that is unique for each CSAT3 and is stored in ROM memory. γ γ... - Page 28 APPENDIX C. CSAT3 MEASUREMENT THEORY is sonic virtual temperature and γ where T REFERENCES the ratio of specific heat of dry air at constant pressure to that at constant volume (Fleagle Kaimal, J. C. and Businger, J. A.: 1963, “A and Businger, 1980;...
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Page 29: Sdm Communications And Long Signal Cables
Communication between the CR23X and example datalogger programs listed at the end CSAT3 fails at the default SDM clock rate. of this section. The example programs start Thus, a slower SDM clock rate must be used. - Page 30 APPENDIX D. SDM COMMUNICATIONS AND LONG SIGNAL CABLES parameters that were tested and their failure rate as a percent of attempts. The following report was created from the above SPLIT parameter file, SDM.PAR. TABLE D-2. SDM Clock Rate Report SDM Clock Rate Report Failures Attempts Param...
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