Olympus BHS-751P Manual de instrucciones - Página 17
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4
3.
Adjustment o f Stage Block Height
In addition to the vertical movement of the
stage by means of coarse and fine adjust-
ments, the stage block height can be changed
for observation of specimens which are
thicker than standard slides. To lower the
stage block;
1 ) Loosen the stage block locking screw
a
with Allen wrench provided, and raise
the stage block until the stopping screw
a
can be seen, then reclamp.
2)
Replace the stopping screw into the lower
threaded hole@).
(Fig. 17)
Fig. 17
3)
Unclamping the stage block again, lower
until it stops, and clamp.
I .
Use of Immersion Objectives
1) Focus the specimen with a low power objective.
2 )
Put a drop of immersion oil on the specimen slide and the front lens of the immersion
objective.
3)
Turn the revolving nosepiece t o bring the immersion objective into the light path, and
focus with the fine adjustment knobs.
NOTE:
a
Care should be taken t o prevent oil bubbles from forming in the oil f i l m If
1
any, re-apply immersion oil, for these bubbles greatly deteriorate the lens
performance.
a
After use carefully wipe off the immersion oil deposited on the lens surfaces
with gauze moistened with xylene. Never leave oil on the lens surfaces after
use as oil remnants will seriously impair the performance of the lens system.
J.
Orthoscopic Observation
1) Swing out the top lens o f the condenser.
In principle, polarized light enters the light path, parallel to the optical axis, t o enable
observation o f the optical characteristics of the specimen. However, this method will
darken the field of view and lower the resolving power o f the objective extremely. There-
fore, swing out the top lens of the condenser, using only the lower aperture of the lower
condenser lens (N.A.
0.25).
2)
Insert the analyzer into the light path,
and attain the crossed filter position with
analyzer and polarizer at
0
setting. A t
this position, the polarizer vibration is in
the X direction, and the analyier vibra-
tion in the
Y
direction. To open the filter
position, pull out the analyzer rotation
screw.
3 )
Rotate the stage until the extinction of
the image is attained, and move the 45"
click stop lever
a
toward the operator.
(Fig. 18)
Fig. 18