Campbell CVF4 Manuál s instrukcemi stáhnout pdf (Strana 27)

CMP6-L, CMP10-L, CMP11-L, and CMP21-L Pyranometers

Battery (Batt_Volt)

'Measure the CMP11

VoltDiff (CMP11_Irr,1,mV25C,2,True ,10000,_60Hz,1000/8.55,0)

CallTable TenMin

NextScan

EndProg

7.3.3.3 CR1000 Example Program for Measuring a CMP21

Although this example is for the CR1000, other CRBasic dataloggers are

programmed similarly. The following program measures the CMP21 every

second. It converts the pyranometer’s millivolt output to W•m

–2

. A

pyranometer calibration of 8.65 μV / W•m

–2

is used for the example program.

The resistance of the internal thermistor is converted to degree Celsius and then

to Kelvin. Every 10 minutes, the program outputs the average and standard

deviation of the flux (W•m

–2

) measurements and temperature measurements.

Wiring for this example is given in TABLE 7-8able 7-8.

TABLE 7-8. CR1000 Wiring for CMP21 Example Program

Wire Color

Description

CR1000

Jumper*

White

Solar Signal (+)

Blue

Solar Signal (–)

Yellow

Voltage Excitation

VX1

Black

Temp Signal

15 SE

Brown

Signal Reference

Clear

Shield

* Jumper 3L to

with user-supplied 26 AWG or larger wire.

'CR1000 Series Datalogger

Public PTemp

Public Batt_Volt

Public CMP21_Irr

Public CMP21_T_C

Public CMP21_T_K

Dim Rs,Vs_Vx

Units CMP21_Irr = W/m2

Units CMP21_T_C = Degrees C

Units CMP21_T_K = Degrees K

DataTable (TenMin,1,-1)

DataInterval (0,1,Min,8)

Minimum (1,Batt_Volt,FP2,0,False)

Sample (1,PTemp,FP2)

Average (1,CMP21_Irr,FP2,False)

StdDev (1,CMP21_Irr,FP2,False)

Average (1,CMP21_T_C,FP2,False)

StdDev (1,CMP21_T_C,FP2,False)

Average (1,CMP21_T_K,FP2,False)

StdDev (1,CMP21_T_K,FP2,False)

EndTable

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