Olympus CHA-P Gebruiksaanwijzing - Pagina 12
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4. Centering the Stage
1) Looking
through
the eyepiece
and
objective
10X,
determine
some
particular point, as
you
like, in the specimen
image and coincide this point with the center of the cross hairs
of the eyepiece.
2) Rotating
the
stage,
coincide
the center of the rotation of
a specimen point with the cen-
ter of the cross hairs by means
of the two centering screws (1),
(Fig. 5)
*
Repeat
this
procedure
until
the centration is secured.
Circular path of
specimen point
Fig. 5
5. Centering the Objectives
This centration is required for all PO objectives except
the objective PO 10X.
1) Insert
a
centering
wrench
(1)
into
each
centering
screw of the nosepiece. (Fig. 6)
2) By means of the two centering wrenches, coincide the
center of the cross hairs to the rotation center of the
specimen.
3) After all objectives are centered, remove the centering
wrenches.
6. Use of Aperture Iris Diaphragm
Adjust
the
opening
of
the
aperture
iris
diaphragm
according
to
various
conditions such
as the numerical
aperture
of
the
objective,
image
contrast,
depth
of
focus, and flatness of field. Generally it is often prefera-
>
70
80%
ble to stop down
the aperture iris diaphragm to 70%
30—20%
or 80% of the N. A. of the objective.
A
À)
^
After
the
eyepiece
is
removed
from
the
observation
tube,
if necessary,
look
through
the observation
tube
and
check
the
opening
of
the
aperture
diaphragm
at the objective pupil.