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Appendix C. CR3000 Program for Measuring Pt-100 Temperature Sensor

C-4

Average (1,albedo,IEEE4,False)

Average (1,Rn,IEEE4,False)

EndTable

DataTable (cnr4_ts,True,-1)

DataInterval (0,1,Sec,10)

CardOut (1,-1)

Sample (4,cnr4(1),IEEE4)

Sample (1,cnr4_T_K,IEEE4)

EndTable

BeginProg

'Load the multiplier values for the CNR4

cnr4_mult(1) = pyranometer_up_mult

cnr4_mult(2) = pyranometer_dn_mult

cnr4_mult(3) = pyrgeometer_up_mult

cnr4_mult(4) = pyrgeometer_dn_mult

Scan (1,Sec,3,0)

PanelTemp (logger_temp,250)

Battery (batt_volt)

'CNR4 radiation measurements

VoltDiff (cnr4(1),4,mV20C,1,True ,0,_60Hz,cnr4_mult(1),0)

'PRT (Pt-100) temperature measurement

Resistance (cnr4_prt_R,1,mV200,8,Ix1,1,1500,True,True,0,_60Hz,1,0)

Rs_R0 = cnr4_prt_R/100

PRT (cnr4_T_C,1,Rs_R0,1,0)

'Convert CNR4 temperature to Kelvin

cnr4_T_K = cnr4_T_C+273.15

'Correct the long-wave radiation values from pyrgeometers

long_up_corr = long_up+5.67e-8*cnr4_T_K^4

long_dn_corr = long_dn+5.67e-8*cnr4_T_K^4

'Compute short-wave net radiation

Rs_net = short_up - short_dn

'Compute long-wave net radiation

Rl_net = long_up - long_dn

'Compute albedo

albedo = short_dn/short_up

'Compute net radiation

Rn = Rs_net + Rl_net

CallTable cnr4_data

CallTable cnr4_ts

NextScan

EndProg

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Campbell CVF4 Specifiche Pagina 58

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