Olympus CHA-P Gebrauchsanweisung - Seite 13
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7. Focusing Adjustment
1) Tension adjustment of coarse adjustment knobs
A tension adjustment ring @ is provided next to the
right hand coarse adjustment
knob.
With
this device
the tension of the coarse adjustment is freely adjust-
able for either heavy or light movement depending on
operator preference.
(Fig. 7)
However,
do
not
loosen the tension adjustment ring
too
much,
because the stage drops, or the fine ad-
justment
knobs slip easily.
*
Be
careful
not to rotate the right and
left coarse
adjustment
knobs
in the opposite directions simul-
taneously.
2) Pre-focusing lever
This lever @ is locked after coarse focus has been
accomplished.
It prevents
further upward
travel
of
the
stage
by
means
of
the
coarse
adjustment
knobs,
and
automatically
provides
a
limiting
stop
if the stage is lowered and then raised again. (Fig. 8)
NS
8. Orthoscopic Observation
Fig. 8
1) Swing out the top lens of the condenser.
In principle, polarized light enters the light path parallel to the optical axis, to enable
observation
of the optical
characteristics of the specimen.
However,
this method
will
darken the field of view and lower the resolving power of the objective extremely.
There-
fore, swing out the top lens of the condenser, using only the lower aperture of the lower
condenser lens.
2) Insert the analyzer into the light path, and attain crossed filter position with analyzer
and polarizer at 0° setting.
At this position, the polarizer vibration is in the north-south
direction, and the analyzer vibration in the east-west direction. To open the filter posi-
tion, pull out the analyzer rotation screw.
3
Rotate
the
stage
until
extinction
of
the
image
is attained.
From
this
position,
rotate the stage
by 45°
to obtain
the diagonal position, at which
position, the retardation angle is measured.
10