Campbell Scientific CMP3 Pyranometer - Manual (Page 12)

CMP3-L Pyranometer
VoltDiff(Solar_Wm2,1,mV25,1,True,0,_60Hz,66.577896,0) ‘use the 50 mV range for the
CR3000, CR5000 and CR9000
'Set negative readings to zero:
If Solar_Wm2<0 Then Solar_Wm2=0
'Calculate units in MJ, where MJ = m * t * 0.000001. m = Solar_Wm2 from above, and
't = 10 (scan interval)
Solar_MJ=Solar_Wm2*0.00001
'Call Data Tables and Store Data
CallTable(Table1)
CallTable(Table2)
NextScan
EndProg
5.4.2 CR10X Example Program
;{CR10X}
*Table 1 Program
01: 10.0000 Execution Interval (seconds)
; CMP3-L measurement in Wm -2
1: Volt (Diff) (P2)
1: 1 Reps
2: 23 25 mV 60 Hz Rejection Range ;use the 50 mV range for the CR7, 21X and CR23X
3: 1 DIFF Channel ;use the 250 mV range for the CR10X if
4: 3 Loc [ Solar_Wm2 ] calibration factor is > 25 µV/Wm -2
5: 66.5778 Multiplier
6: 0 Offset
; Set negative values to zero
2: If (X<=>F) (P89)
1: 3 X Loc [ Solar_Wm2 ]
2: 4 <
3: 0 F
4: 30 Then Do
3: Z=F x 10^n (P30)
1: 0 F
2: 0 n, Exponent of 10
3: 3 Z Loc [ Solar_Wm2 ]
4: End (P95)
; Calculate units in MJ, where MJ = m * t * 0.000001.
; m = Solar_Wm2 from above, and t = 10 (scan interval).
5: Z=X*F (P37)
1: 3 X Loc [ Solar_Wm2 ]
2: .00001 F
3: 4 Z Loc [ Solar_MJ ]
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