User's Guide _______________________________________________________________________
170 __________________________________________________________________ M211107EN-C
4. After the optical surfaces are properly cleaned, check that the
WINDOW CONT values of both the receiver and transmitter in the
status message are close to zero. This can also be checked
afterwards through a remote (modem) line.
NOTE
The windows must be dry before checking the WINDOW CONT values.
5. If the WINDOW CONT values are not close to zero, give the
command CALIBRATE WINDOW_CLEAN
VISIBILITY_SENSOR. This command has no parameters and it
is used to set the clean references for the contamination control.
The command also sets the reference for the backscatter
measurement.
NOTE
The windows must be dry before giving the
CALIBRATE
WINDOW_CLEAN VISIBILITY_SENSOR
command.
NOTE
There must not be any objects in the measurement volume when the
CALIBRATE WINDOW_CLEAN VISIBILITY_SENSOR
command
is given. Especially, the opaque glass plates used for visibility
calibration must be removed first.
While cleaning the windows and the hoods, it is also recommended to
clean the window of the Background Luminance Sensor according to the
instructions of the LM21 User's Guide (see section
Related Manuals on page 11).
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