User's Guide ______________________________________________________________________
232 _________________________________________________________________ M210667EN-C
0401-115
Figure 131 Scanning Axes during Fine Alignment
The user is requested to start the calibration procedure immediately.
NOTE
A Signal indication of at least 60 % is recommended to be achieved after
the fine alignment procedure is finalized. Otherwise please doublecheck
the raw alignment.
NOTE
It is highly recommended to perform the calibration procedure after the
fine alignment.
Proceed with Calibration? (yes/no):
To confirm, type yes<CR>.
To abort the action, type no<CR>.
Calibration
The LT31 subsystems, such as transmitter/receiver measurement units
and PWD sensor, are calibrated at the factory. As the achievable
measurement signal depends on the individual tolerances of the
opto-electronic systems and the alignment result itself, the measurement
signal has to be correlated to the prevailing visibility to bring the
transmissometer into a final operational condition.
Due to the LT31 system topology, an overall calibration is necessary
during initial set-up of the LT31 system. Furthermore, calibration is
necessary whenever any alignment procedure has been performed.
Depending on the situation, an offset and visibility calibration or a
visibility calibration only must be carried out.
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