8
2.3 Filter
Unit
Remove the lid from the filter unit and replace the filter (see Fig. 2.5).
589
nm
Front of the instrument
Filter
Figure 2.5 Top view of filter unit
Note: Lightly pressing the left and right ends of the disk pops up the lid of the filter
unit.
The filter must be inserted in a specified direction. Insert it by noting the
wavelength indication at the top of the filter, as illustrated. If it is inserted an
incorrect orientation,
ʺ″
ERROR
ʺ″
will appear.
To keep out dust and foreign matter and to prevent light leakage, keep the lid
closed except when replacing.
