User's Guide ______________________________________________________________________
248 _________________________________________________________________ M210667EN-C
NOTE
A proper linearity test demands stable and homogenous atmospheric
situations. Whenever the
APPLIED FILTER VALUE
is displayed as
NONE
, the 2-minutes-Variation-versus-current-Measurement deviation
and the Reference-Quality-Indication may be used to judge the change
of the prevailing atmospheric situation.
For standard linearity tests it is recommend that the Reference-Quality-
Indication be read as 'steady' or 'very steady'.
If the prevailing visibility has changed so much that the once taken
reference is not longer a proper one, the current visibility can be set as
the new reference by pressing R.
Once the filter holder is mounted to the receiver support unit and an
optical filter has been chosen to be applied to the optical path, the user
has to give the filter value to the system.
Enter Filter Value (e.g. 0.5)! (ESC to exit):
NOTE
The filter values are given as decimal values. A so called 50 % filter has
the filter value of 0.5.
NOTE
If a combination of optical filters will be applied, the overall filter value
is the product of all individual filter values. To calculate the overall filter
value for combinations of optical filters, the individual filter values have
to be multiplied.
Example: Three optical filters will be applied. The individual filter
values are 0.72, 0.71, and 0.51. The overall filter value is
0.72 x 0.71 x 0.51 = 0.264384.
The filter value of any optical filter is mentioned on the calibration label
on the optical filter.
After typing the filter value (e.g.
0.7239<CR>
), the user is asked to apply
the filter.
Apply Filter! Done? (yes/no):
To confirm, type
yes<CR>
.
To abort the action, type
no<CR>
.