Apogee Instruments SP-230 Gebruikershandleiding - Pagina 8
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Cosine Response:
Directional, or cosine, response is defined
as the measurement error at a specific
angle of radiation incidence. Error for
Apogee silicon-cell pyranometers is
approximately ± 2 % and ± 5 % at solar
zenith angles of 45° and 75°, respectively.
Mean cosine response of eleven Apogee
silicon-cell pyranometers (
represent two standard deviations
above and below mean
response measurements were made
during broadband outdoor radiometer
calibrations (BORCAL) performed during
two different years at the National
Renewable Energy Laboratory (NREL) in
Golden, Colorado. Cosine response was
calculated as the relative difference of
pyranometer sensitivity at each solar
zenith angle to sensitivity at 45° solar
zenith angle. The blue symbols are AM
measurements, the red symbols are PM
measurements.
8
error bars
). Cosine