Apogee SQX Series Owner's Manual - Page 8

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Apogee SQX Series Owner's Manual
Cosine Response
Directional, or cosine, response is defined as the
measurement error at a specific angle of radiation
incidence. Error for Apogee SQ-100X series quantum
sensors is approximately ± 2 % and ± 5 % at solar
zenith angles of 45° and 75°, respectively.
Mean cosine response of five SQ-
100X series quantum sensors.
Cosine response measurements
were made by direct side-by-side
comparison to the mean of seven
reference SQ-500 quantum
sensors.