Incidental light results in a positive signal. The pyranometer mounting plate and ambient air should
be at the same temperature, as much as possible. Conversion of the voltage to irradiance can be
done according to equation 1.1. This is sometimes done in the data logging system itself,
sometimes during evaluation in the user's software. Measuring with the upward-facing CM 3, the socalled
global (solar) radiation is measured. The downward-facing CM 3 measures the reflected solar
radiation. When calculating the Net radiation, the Reflected radiation must be subtracted from the
global radiation. See 1.1.2.5.