Olympus BHS-651P Manuel d'instruction - Page 17

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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

with Allen wrench provided, and raise

the stage block until the stopping screw

can be seen, then reclamp.

Replace the stopping screw into the lower

threaded hole@).

(Fig. 17)

Fig. 17

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.

Turn the revolving nosepiece t o bring the immersion objective into the light path, and

focus with the fine adjustment knobs.

NOTE:

Care should be taken t o prevent oil bubbles from forming in the oil f i l m If

any, re-apply immersion oil, for these bubbles greatly deteriorate the lens

performance.

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.

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).

Insert the analyzer into the light path,

and attain the crossed filter position with

analyzer and polarizer at

setting. A t

this position, the polarizer vibration is in

the X direction, and the analyier vibra-

tion in the

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

toward the operator.

(Fig. 18)

Fig. 18