USER'S GUIDE____________________________________________________________________
98 __________________________________________________________________ M210482EN-D
9. In case there are no clouds present and if the site is suitable, do a
hard target test. Turn the measurement unit 90 degrees and aim it
on a fixed target (such as a wall or a forest front).
The minimum distance to a hard target should be 300 meters
(1 000 ft). The backscatter signal from a hard target is very strong
compared to the signal from a cloud. The receiver may saturate if
the distance is too short.
CAUTION
When tilting the unit, make sure that nobody is watching the beam with
binoculars or other magnifying optics.
Disable the automatic angle correction with the following
commands:
CEILO > SET MESSAGE ANGLE_COR OFF
CEILO > CLOSE
Compare the distance reading of the ceilometer to a reference
measurement.
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