Unitron EXAMET-4, Руководство пользователя, Страница: 19 / 25

EXAMET-4 SERIES MICROSCOPE
UNITRON
®
73 Mall Drive, Commack, NY 11725 • 631-543-2000 • www.unitronusa.com
19
OPERATION
(continued)
Centering the Condenser
- Transmitted Illumination
(Fig. 27-28)
Turn the condenser adjustment knob

to raise it
to its highest position.
Turn the spanner

to move the front lens into
the light path.
Rotate the 20x objective into the light path and
focus the specimen.
Rotate the field diaphragm adjustment ring

to
move the field diaphragm to the smallest position.
The image of field diaphragm can be observed
through the eyepiece.
Adjust the condenser centering adjustment screw

to center the image of field diaphragm to the
field of view.
Open the field diaphragm slowly. If the image is
in the center and inscribed to the field of view, the
condenser is correctly centered (Fig. 28).
In use, you can enlarge the field diaphragm a bit
and make the image circumscribed to the field of
view.
Field Diaphragm
- Transmitted Illumination
By limiting the amount of light entering the
condenser, the field diaphragm can prevent
other light and strengthen the image contrast.
When the image is just on the edge of the field
of view, the objective will obtain the clearest
image.
Fig. 27
Fig. 28
Fig. 29