Cimel CE318-T User Manual

CE318-T Photometer
User Operation Manual
Revision V4.10 October 2021
60
4.3. Day and night measurement schedule in Auto mode
Standard (CE318-TS9) and polarized (CE318-TP9)
The photometer follows a daily schedule of automatic actions. Some actions are
triggered by the time of the day and some by the air mass which is related to the
thickness of atmosphere the sun light has been through to get to the photometer
(Langley times). The Langley times depend on both the site where the photometer is
located and the date. They are automatically calculated and set in the photometer
sequence list each day at 1AM.
Moreover night time measurements can be done. It is important to notice that night
time measurements are not activated by default.
To activate night time measurements and to choose the measurement period, go in
the SETTINGS menu on the CU. (See part 3.7)
- switch Moon setting to ON
- choose a value between 2 and 15 min in P.moon setting (default 3mn)
Automatic actions done by the photometer in Auto mode (day and night time):
Air mass
Equivalent zenith angle
(0°: Zenith ; 90°: Horizon)
Group
Air mass 7.0
81.8°
Group A
Air mass 6.5
81.15°
Group A
Air mass 6.0
80.40°
Group A
Air mass 5.5
79.52°
Group A
Air mass 5.0
78.46°
Group A
Air mass 4.5
77.16°
Group A
Air mass 4.0
75.52°
Group E
Air mass 3.8
74.74°
Group A
Air mass 3.6
73.87°
Group A
Air mass 3.4
72.89°
Group A
Air mass 3.2
71.79°
Group A
Air mass 3.0
70.53°
Group C
Air mass 2.8
69.07°
Group A
Air mass 2.6
67.38°
Group A
Air mass 2.4
65.37°
Group A

Cimel CE318-T Specifications

General

Brand	Cimel
Model	CE318-T
Category	Measuring Instruments
Language	English