Apogee Instruments SQ-100X Series Owner's Manual - Page 9

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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 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.