Campbell-scientific CMP6-L, CMP11-L, and CMP21-L Pyranometers Uživatelský manuál stáhnout pdf (Strana 28)

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

'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

BeginProg

Scan (1,Sec,0,0)

‘Measure the Battery Voltage and Panel Temperature

PanelTemp (PTemp,250)

Battery (Batt_Volt)

‘Measure the CMP21 pyranometer

VoltDiff (CMP21_Irr,1,mV25C,3,True,10000,_60Hz,1000/8.65,0)

'CMP21 Thermistor Measurement

BrHalf (Vs_Vx,1,mV5000,15,Vx1,1,2500,True ,0,250,1.0,0)

Rs = 1000*(Vs_Vx/(1-Vs_Vx))

CMP21_T_C = 1/(1.0295e-3+2.391e-4*LN(Rs)+1.568e-7*(LN(Rs))^3)-273.15

'Convert CMP21 temp to Kelvin.

CMP21_T_K = CMP21_T_C+273.15

CallTable TenMin

NextScan

EndProg

7.3.3.4 CR10X Example Program for Measuring a CMP6

The following program uses a CR10X to measure a CMP6 every 10 seconds

and convert the mV output to W•m

–2

and MJ•m

–2

. A sensor calibration of

14.33 µV / W•m

–2

is used for this example program. The program outputs an

hourly average flux (W•m

–2

), and a daily total flux density (MJ•m

–2

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 41 42

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Campbell-scientific CMP6-L, CMP11-L, and CMP21-L Pyranometers Uživatelský manuál Strana 28

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