CE318-T Photometer
User Operation Manual
Revision V4.10 October 2021
62
Night time measurements are executed if:
• The moon phase is between the first and last quarter
• Moon air mass is higher than 7
• Sun air mass is below -7. Sun air mass below -7 means that the sun is already
set and far enough so that it is not lightening too much the sky.
BRDF (CE318-TU9) and BRDF 12 filters (CE318-TU12)
The BRDF Photometer executes Group S scenario every day from sun air mass 5 in
the morning to sun air mass 5 in the evening. (A group S scenario is around 2h long).
The group S scenario automatically starts at a round True Solar Time minute if no other
scenario is running.
Note 1: The Almucantar is executed only if the sun zenith is between air mass 4.0 and
air mass 1.5.
Note 2: A PARK, GOSUN and 3SUN are executed between each zenith angle change.
SEAPRISM (CE318-TV12)
The SEAPRISM photometer executes group P scenario every day from sun air mass
5 in the morning to sun air mass 5 in the evening. The group P scenario automatically
starts at every round hour and half hour True Solar Time.
Before air mass 5 and after air mass 5 the SEAPRISM photometer executes the
STANDARD scheduler.
Polarized (CE318-TP9)
After each 3 MOON scenario, the Polarized photometer can execute a MOONP
scenario.
Note 1: The “Pol moon” setting has to be activated in PW of the CU.
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