Campbell-scientific Bowen Ratio Instrumentation Manual de usuario descargar pdf (Pagina 21)

3-1

Section 3. Sample CR23X Program

The example program is available on the Campbell Scientific FTP site,

ftp://ftp.campbellsci.com/pub/outgoing/files/br_023a.exe. The example

program measures the standard Bowen ratio inputs: vapor pressure and air

temperature gradients, net radiation, and soil heat flux (flux at 8 cm and change

in temperature of the soil layer above). If additional measurements are to be

made or if a different installation is to be used, the program will have to be

altered. Note that even if this exact installation is used, the correct calibration

(multiplier and offset) must be entered for the net radiometer and soil heat flux

plates.

Table 3-1 is a flow chart of the example program and Table 3-2 lists the output

generated by the program.

Power to the pump and cooled mirror is switched on and off by the datalogger.

This can be under manual control by setting a flag in the *6 Mode (flag 6 to

turn on, flag 7 to turn off), or automatically by the program if the battery

voltage drops below 11.5 volts (subroutine 2).

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Campbell-scientific Bowen Ratio Instrumentation Manual de usuario Pagina 21