Apogee Instruments SP-230 Manual do Proprietário - Página 12
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Silicon-cell pyranometers can still be used to measure shortwave radiation in conditions other than clear
sky or from radiation sources other than incoming sunlight, but spectral errors occur when measuring
radiation with silicon-cell pyranometers in these conditions. The graphs below show spectral error
estimates for Apogee silicon-cell pyranometers at varying solar zenith angles and varying atmospheric air
mass. The diffuser is optimized to minimize directional errors, thus the cosine response graph in the
Specifications section shows the actual directional errors in practice (which includes contributions from
the spectral shift that occurs as solar zenith angle and atmospheric air mass change with time of day and
time of year). The table below provides spectral error estimates for shortwave radiation measurements
from shortwave radiation sources other than clear sky solar radiation.
Spectral error for Apogee SP
series pyranometers as a function
of solar zenith angle, assuming
calibration at a zenith angle of 45°.
Spectral error for Apogee SP
series pyranometers as a function
of atmospheric air mass, assuming
calibration at an air mass of 1.5.
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