Olympus BHA-P Manuale di istruzioni - Pagina 15
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8.
Focusing Adjcistment
1 )
Tension adjustment of coarse adjustment ltnobs
A tension adjustment ring
IS
provided nc!xt to the
riqlit hand coarse adjustment knob. With this clevice the
terisior) o f the coarse adjustment is freely adjustable
lo^.
eittier- heavy o i liclti t movement rfependincl or1 opcrator
01-eference.
Iiowever, d o n o t loosen thc: tension adjustrnent rlny too
rnoch, because the stage clrops, or the fine adjustrncnt
knobs sl111 eas~ly.
Fig.
7
*
Be careful n o t t o rotate the right and left coarse adjust-
m e n t knobs
in
the opposite directions sim~iltaneously.
2)
Pre-focusing lever
This levci.
3)
is locked after coarse focirs has been
accomplished. I t prevents further ~ i p w a r d travel o f the
stage by nienns of the coarse adjustrnent knobs, and
autoniatically provides a liiniting stop if the stage is
lowered and then raised agaln. (Fig.
8)
F I ~ .
8
9.
Orthoscopic Observation
1 ) Swing o u t tile top eris
of
the condensel
In principle, polarizided light enters the light path, parallel t o the optical axis, t o enable
observalion of the optical characler~st~cs o f the specirnen. However, this method w i l l
darken the field o f view and lower the resolving power o f the objective extremely. There-
fore, swing out the top lens o f the condenser, using only the lower aperture of the lower
condenser lens.
2)
Insert the a n a l y ~ e r i n t o the light path, and attain the crossed filter position w i t h analyzer
and polari7er at
0
setting.
A t this p o s ~ t o r i , the p o l a r i ~ e r v i b r a ~ i In is in the north-south
direction, and the analyzer vibration i n the east-west d ~ r e c t i o n . T o open the filter posi-
tion, p u l l out the analyrer rotation screw.
3)
Rotatc the stage u n t i l the extinction o f the image is
a t t a n e d , and n)ove tlic
4 5 '
click stop lever
$
toward
the operator.
(Fig, 9)
Frorn this position, i t is easy to rotate the stage i n
4 5 '
Increments w i t h o u t having to ircfer t o the angular
scale, and the stage clicks at the c l l a ~ o n a l position, at
\vliicii position. the retardation angle i s measured. T o
relcase the
45O
c l ~ c k stops, push back the
45"
click slop
lever.
I
Fig.
9