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CSAT3 will send wind speed and the sonic virtual temperature via the SDM bus to the

datalogger.

Ux input location: The input location to store the first of five data values. The CSAT3

returns the following data after receiving the "trigger and get data" command in

parameter 3: u, v, w, T and a diagnostic word.

Diagnostic word: The fifth output from the CSAT3 is the diagnostic word. The diagnostic

word describes the status of the anemometer and is useful in filtering data. For example,

when the anemometer is locking in on the ultrasonic signals after receiving the acquire

signals command, the -99999's it sends to the datalogger can be filtered out of the

statistics based on the diagnostic word.

Appendix 1 shows a sample program for the SDM-CSAT3 (P107) used with a CR23X

datalogger.

8. Data collection

To start data collection, connect the CSAT3 to power (see Table 1). The CSAT3 will start

taking data if the data logger program has been transferred to the internal memory. The

data logger program will be on the CR23X before the experiment starts and it will reside

in the internal memory for the entire duration of the experiment. In case of a power

outage, the data logger will resume taking data after it has been reconnected to power. To

stop data collection, disconnect the power line.

9. Data Transfer

- The data is stored on the internal memory of the CR23X datalogger. Once per day,

the data needs to be retrieved from the datalogger. A laptop is used for this purpose.

Connect the laptop via the RS232 cable (stored in the enclosure of the metstation) -

use the parallel port of the laptop - to the CR23X. Start Campbell Scientific data

communication software package PC208 (shortcut is on desktop of the laptop;

PC208.exe file is located under C:\PC208).

- Do the following to save the data on the hard drive of the laptop: Open datalogger

session. Retrieve data. Save (user will be prompted to give file name; default format:

Year, Day, Hour/Minute, Seconds (2400 at midnight) - accept); Data logger will send

data from time since last data has been retrieved by user;

- Transfer data with portable zip drive/disk to desktop computer in lab. Do NOT

remove the data from the hard drive of the laptop in the field.

- Write data to cd.

- Note date/time of data transfer and storage in field logbook.

- Data validation and transfer to data manager Ziad Ramadan at Clarkson University

([email protected]): The data will be validated at Johns Hopkins University (in

charge for this operation are Markus Pahlow and Jan Kleissl). A completeness check

will be performed and missing data will be designed as -99999. After data validation

the data will be sent (via email) once per week to the data manager. One file for every

day in ASCII format.

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Campbell CSAT3 Manual de usuario Pagina 6