Leica DM2000 Operating Manual page 32

7. Start-up
• Set the light intensity using the brightness
control (33.2, 35.2).
• Close the field diaphragm (33.4, 35.3) until the
edge of the diaphragm appears in the
specimen plane (34a).
• Using the condenser height adjuster (33.3,
35.1), adjust the condenser until the edge of
the field diaphragm appears in sharp relief
(34b).
• If the image does not appear in the middle of
the field of view (34c), the condenser must be
moved into the middle of the field of view with
the help of the two centering bolts (35.4). The
tool required for this purpose is magnetically
attached to the underside of the stage.
• Open the field diaphragm just enough for it to
disappear from the field of view (34d).
Fig. 33 Leica DM2500
1 Focus wheel
2 Brightness control
3 Condenser height adjuster
4 Field diaphragm control
5 On/off switch
6 Condenser centering
7 Stage positioning
1
32
2 3 4 5 6
Note:
The condenser height adjustment depends on
the thickness of the specimen. It may be
adjusted for different specimens.
Fig. 34 Köhler Illumination
a Field diaphragm not focused, not centered
b Field diaphragm focused, but not centered
c Field diaphragm
Diameter shown here is too small
d Field diameter (light) = Field diameter (view)
(Köhler Illumination)
Fig. 35
1 Condenser height adjuster
2 Brightness control
3 Field diaphragm
4 Condenser centering
7
a
c
1 2 3
b
d
4