Olympus VANOX Buku Petunjuk - Halaman 22
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F.
Focusing Procedure
Both coarse and fine focusing adjustments affect vertical
stage displacement.
Since all objectives are parfocal only a minimum of fine adjustment motion is vequired
when changing objective powers.
1. Standard Focusing Procedure
1
)
Operate the fine adjustment knob
to
bring the fine adjustment indicator line
to the
center
of the
fine
adjustment range. (Fig" 14)
2)
Please the objective 10X in position.
3) Bring the specimen close t o the objective
with
the coarse adjustment knob.
4) While looking through the eyepiece,
lower the stage slowly and focus on the
specimen.
5) Turn the revolving nosepiece
to
b r ~ n g the objective to be used
Into
the light path.
6)
Set the auxiliary lens system according to the magnification of the objective.
7)
Adjust aperture iris diaphragm and field iris diaphragm
{See page
21
.)
8 ) Focus
accurately with
the fine adjustment knob
*
Be sure t o rotate
the nosepiece only by its knurled ring.
Fig. 14
Fig.
15
2. Automatic Pre-Focusing
Lever (Fig.
15)
This lever i s provided t o prevent possible contact between specimen and objective
as well as to simplify coarse focusing.
The
lever is locked after coarse focus has been accomplished. This prevents further
upward travel of t h e stage and automatically provides a limiting stop if the stage
is
lowered and Then raised again.
The
automatic pre-focusing
lever
does not restrict fine focusing.
3.
Tension Adjustment of Coarse Adjustment Knobs
While the coarse adjustment motion is normally stiff and heavy, it is freely adjustable for
either heavy or l
ight movement depending on the observer's preference. To adjust the
tension hold the
two
coarse adjustment knobs with your both hands and rotate them
in
the opposite direction
a t
the same time. (Fig 16)
F i g . 16