Campbell CS106 Manuale delle Istruzioni Scaricare il pdf (Pagina 26)

Appendix B. Example Programs

B.2 CR1000 Program Using Pipeline Mode

Although this example is for the CR1000, other CRBasic dataloggers, such as

the CR6, CR200(X), CR800, CR850, CR3000, and CR9000(X) are

programmed similarly. In the example, the CR1000 measures the CS106 once

an hour in a program that runs at 1 Hz. In order to keep the CR1000 running in

a pipeline mode, the measurement instruction is placed outside the “If”

statement. The measurement is made every scan, and the measured value is

first written into a temporary variable called “CS106_temp”. Once the CS106

is turned on one minute before the hour, the CS106 starts to make the correct

pressure measurements. At the top of the hour, the correct value is copied into

the current variable called “pressure”, and the sensor is turned off immediately.

The program’s integration parameter for the VoltSE() instruction is _60Hz.

However, for Eddy Covariance programs or other datalogger programs that are

executed at a higher frequency, the integration parameter should be 250 µs

instead of _60Hz or _50Hz. This prevents skipped scans.

'CR1000 Datalogger

Public CS106_temp, pressure

Units pressure = mbar

DataTable (met_data,True,-1)

DataInterval (0,60,min,10)

Sample (1,pressure,IEEE4)

EndTable

BeginProg

PipeLineMode

Scan (1,sec,3,0)

'Measurement is made every scan outside the "If" statement

VoltSE (CS106_temp,1,mV2500,1,False,0,_60Hz,0.240,500)

'Turn on CS106 one minute before the hour

If (TimeIntoInterval (59,60,min)) Then WriteIO (&b1000,&b1000)

'Copy the correct value to a current variable called "pressure" at the top of the

hour

'Turn off CS106 after the measurement

If (TimeIntoInterval (0,60,min)) Then

pressure = CS106_temp

WriteIO (&b1000,&b0)

EndIf

CallTable met_data

NextScan

EndProg

B-2

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Campbell CS106 Manuale delle Istruzioni Pagina 26