Campbell Scientific CNR2 Radiometer - 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