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計測機器 Apogee Instruments SP-230のPDF オーナーズマニュアルをオンラインで閲覧またはダウンロードできます。Apogee Instruments SP-230 18 ページ。 Pyranometer
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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.