Campbell Scientific CNR4 Net Radiometer User Manual

Page 33

CNR4 Net Radiometer

'CR3000 Series Datalogger
'

'CNR4 program
'This program measures CNR4 four-component net radiometer
'This program also measures the thermistor inside the CNR4

'
'User must enter the sensitivity values for all four probes in the program and save/compile
'prior to downloading it to the datalogger.

'Search for the text string "unique" to find places to enter the sensitivity values.
'

'Wiring Instructions
'

'ANALOG CHANNELS
'1H CNR4 Pyranometer Upper signal (red)
'1L CNR4 Pyranometer Upper signal reference (blue)

'gnd jumper to 1L
'
'2H CNR4 Pyranometer Lower signal (white)

'2L CNR4 Pyranometer Lower signal reference (black)
'gnd jumnper to 2L
'

'3H CNR4 Pyrgeometer Upper signal (grey)
'3L CNR4 Pyrgeometer Upper signal reference (yellow)
'gnd jumper to 3L

'
'4H CNR4 Pyrgeometer Lower signal (brown)

'4L CNR4 Pyrgeometer Lower signal reference (green)
'gnd jumper to 4L
' CNR4 shield (clear)

'
'
'8H

'8L CNR4 thermistor signal (white)
'gnd CNR4 thermistor signal reference (black)
' CNR4 thermistor shield (clear)

'

'VOLTAGE EXCITATION

'
'VX1 CNR4 thermistor voltage excitation (red)

'

'CNR4 sensor

Public logger_temp, batt_volt
Public cnr4(4)
Alias cnr4(1) = short_up

Alias cnr4(2) = short_dn
Alias cnr4(3) = long_up
Alias cnr4(4) = lo g_dn

Public cnr4_T_C

'CNR

ius

4 thermistor temperature in Celc

Public cnr4_T_K

'CNR4 thermistor temperature in Kelvin

Public long_up_cor

'Dow

re correction

nwelling long-wave radiation with temperatu

Public long_dn_cor

'Upw

ection

elling long-wave radiation with temperature corr

Public Rs_net

'short-wave net radiation

Public Rl_net

'long-wave net radiation

Public albedo

'Albedo

Public Rn

'total net radiation

Units logger_temp degC

Units batt_volt = olts

Units short_up = W m^2

Units short_dn = W m^2

Units long_up = W/m^2
Units long_dn = W/m^2

Units cnr4_T_C = deg_C
Units cnr4_T_K = K