3 calculation of the net solar radiation, Wiring – Campbell Scientific CNR2 Radiometer User Manual
Page 10
CNR2 Net Radiometer
4.3 Calculation of the Net Solar Radiation
The net radiation, E
NET
, is calculated using the sensor measurement results for
net short-wave radiation and net long-wave radiation. The net radiation is the
difference between the net short-wave and net long-wave radiation.
E
NET
= E
NETSW
+ E
NETLW
5. Wiring
The two radiation outputs from CNR2 Net Radiometer can be measured using
differential or single-ended inputs on the datalogger. A differential voltage
measurement (VoltSE instruction in CRBasic or Instruction 2 in Edlog) is
recommended because it has better noise rejection than a single-ended
measurement.
FIGURE 5-1. Pin Layout on Campbell Scientific Black Cable
TABLE 5-1. CRBasic Datalogger
Connections for Differential Measurement
Heat Shrink Label
Color
Pin
Number
CR800/CR850
CR1000/CR3000/CR5000
Pyranometer Sig
White
1
Differential Input (H)
Pyranometer Ref
Blue
2
Differential Input (L)
Pyrgeometer Sig
Brown
3
Differential Input (H)
Pyrgeometer Ref
Black
4
Differential Input (L)
Shield Clear
6