Campbell Scientific CMP6-L, CMP11-L, and CMP21-L Pyranometers - Manual (Page 27)

CMP6-L, CMP11-L, and CMP21-L Pyranometers
'CR1000 Series Datalogger
Public PTemp
Public Batt_Volt
Public CMP11_Irr
Units CMP11_Irr = W/m2
DataTable (TenMin,1,-1)
DataInterval (0,1,Min,4)
Minimum (1,Batt_Volt,FP2,0,False)
Sample (1,PTemp,FP2)
Average (1,CMP11_Irr,FP2,False)
StdDev (1,CMP11_Irr,FP2,False)
EndTable
BeginProg
Scan (1,Sec,0,0)
'Measure the Battery Voltage and Panel Temperature
PanelTemp (PTemp,250)
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 7-8.
TABLE 7-8. CR1000 Wiring for CMP21 Example Program
Wire Color Description CR1000 Jumper*
White Solar Signal (+) 3H
Blue Solar Signal (–) 3L
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.
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