16
Fig. 23
}When using the U-CTAD centering adapter for objective lens, perform the
operation in “
3
Adjusting the Centering Adapter for Objective Lens” on
the next page before proceeding to the following steps.
}When the U-CTAD centering adapter for objective lens is not used,
switching the objective may deviates the rotation center of the rotary
stage from the center of the field of view. If strict alignment is required,
adjust centering every time after switching the objective.
1. Place the specimen on the stage.
2. Find a mark
1
on the specimen and bring that to the center of cross
lines in the cross-eyepiece.
3. Loosen the stage rotation clamping knob
2
, rotate the stage and turn
the two stage centering knobs
4
to bring the center of the virtual circle
3
, drawn by the rotation of the stage, to the center of the cross lines.
4. Move the specimen alone and bring a second mark to the center of the
cross lines.
}Repeat steps 3 and 4 a few times until the center of stage rotation
coincides with the center of the eyepiece cross lines.
2. Align the center of the reference plane of the orientation plate with the cross lines of the eyepiece, and engage the
analyzer in the light path to achieve the cross-Nicol condition.
3. While observing the oriented plate, rotate the stage till the orientation plate looks darkest, and clamp the stage rotation there.
Rotate the stage so that the bottom edge of the dark orientation plate is adjacent to the cross line.
4. Disengage the analyzer from the light path for the brightfield, and loosen the observation tube clamping screw slightly.
5. Rotate the observation tube so that the cross line in the eyepiece is in parallel with the bottom edge of the orientation
plate, and tighten the observation tube clamping screw.
Orientation
plate
Cross lines in eyepiece
Reference line
Parallel
2
Centering the Rotary Stage
(Figs. 23 & 24)
Fig. 24
1
1
3
4
2
