Olympus BHS-653P Manuel d'instruction - Page 15

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Centering the Stage

1) Place a specimen on the stage, and insert two centering wrenches

into the stage center-

ing screws (Fig. 13). Looking through the eyepiece and objective IOX, fix your eyes on

some particular point, for instance, at the point A or the center of the cross hairs.

2) As you rotate the stage, the particular point in the specimen image moves f rom the point A

in a circular path ( A

A or A

A ) around the center of the

circular path E. (Diag. a)

3) When the stage is turned by 180° from the

point A, the particular point coincides with

the point C.

4) Coincide the particular point to the point E

by means of the two centering wrenches

(Fig. 13). (Diag. b)

5) Next, move the particular point from the

point E to the center A of the cross hairs

(Diag.

c).

Ir Repeat this procedure until the stage centra-

tion is complete. After completing the cen-

tration, remove the wrenches.

Fig. 13

Diag. a

Diag. b

Diag. c

Centerins the Obiectives

This objective centration is necessary to all

the PO objectives except P010X. After

completing the stage centration, insert two

centering wrenches

into the objective

centering screws provided at each centerable

objective aperture in the nosepiece. (Fig.

14) The other procedure is just the same as

with stage centration.

Use of Iris Diaphragms

Fig. 14

When the top lens of the polarizing condenser is swung out for orthoscopic observation, the

aperture iris diaphragm serves as a field iris diaphragm and the field iris diaphragm as an aper-

ture iris diaphragm.

For conoscopic observation, generally the aperture iris diaphragm is fully opened and the

field iris diaphragm can be effectively used for reduction of glares and conoscopicobserva-

tion of very small objects.