Olympus BHS-751P Manuel d'instruction - Page 14

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Centering the Condenser

1) Bring the objective 10X into the light path.

If a specimen is placed on the circular rotat-

able stage without a mechanical stage it is

recommended t o hold the peripheries of the

specimen with the stage clips provided.

2) Swing in the condenser top lens, and bring

the specimen into focus.

3 ) Stop down the field iris diaphragm

O .

slightly blurred image of the field diaphragm

can now be seen in the eyepiece. (Fig. 1 1 )

Fig. 11

4) Adjusting the condenser height, focus on the

image o f the field diaphragm.

If the specimen slide is too thick, i t is sometimes impossible to obtain a sharply-focused

Image.

5) While widening the diameter of the field progressively, use the condenser centering screws

t o bring the diaphragm image into the center of view. (Fig. 11)

6) Push analyzer

into the light path, and

--.

7 7 7 3 ? w - , *

make sure that both polarizer and analyzer

are set at position "0" t o attain the "crossed

filter" position. Then loosen the clamping

screw

of the polarizer. (Fig. 12)

Remove the specimen out of the light path

that a transparent area comes into the

light path. Keeping the polarizer at the

"0"

position, rotate the polarizer rotation ring

until the optimum extinction is obtained,

then clamp the ring. (Fig. 12)

Make sure that no test plate i s engaged.

Fig.