The properties of CNR 1 are mainly determined by the properties of the individual sensors, both the
CM 3's and CG 3's. These are discussed in the following chapters. The combination of these
sensors offers the advantage of accuracy, robustness, and the possibility to evaluate the quality of
the measured data.
Generally the accuracy of CNR 1 will be higher than that of competitive Net-Radiometers. The main
reason for this is that the solar radiation measurement performed by the CM 3 is accurate, and
offers a traceable calibration. Due to the fact that the Net Solar radiation can be very intense, 1000
Watts per square metre compared to a typical -100 for the Net Far Infrared radiation, the accuracy
of the solar measurement is very critical. The CM 3 is an instrument that complies with the ISO
second class specifications, and can be relied upon to give an accurate reading. Wind corrections,
as applied by less accurate competitive instruments are not necessary. The robustness of the
materials used implies that CNR 1 will not suffer from damage inflicted by birds Figure 2.1 depicts a
drawing of CNR 1. From a spectral point of view, the CM 3 and CG 3 are complementary. Together
they cover the full spectral range: The CM 3 from 0.3 to 3 microns, and the CG 3 from 5 to 50
microns. The gap between these two produces negligible errors.