Olympus BHTP Manuale di istruzioni - Pagina 17
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17
3.
ADJUSTMENT
OF
STAGE
BLOCK
HEIGHT
In
addition
to
the
vertical
movement
of
the
stage
by
means
of
coarse
and
fine
adjustments,
the
stage
block
height
can
be
changed far
observation
of
specimens
which
are
thicker
than
standard
slides.
T o
lower
the
stage
block:
F=--
1)
Lmmn
the
stage
block
loching
screw
El
with
Allen
wrench
provided,
and
raise
the
stage
block
until
the
stopping
screw
El
can
be
seen:
then reclamp.
2) Replace the stopping
screw into the lower threaded hole El. (Fig.
17)
3)
Unctamping the stage block again, lower until
it
stops, and clamp.
I.
U s e
of Immerdon
Objectives
I . Focus
the specimen with a low power objective.
2. Put
a
drop of immersion oil
on
the specimen slide and the front lens of the
immersion objective.
3. Turn the revolving nosepiece to bring the immersion objective into the
light path, and focus with the fins
adjustment
knobs.
NOTE:
E l
Care should
be
taken to prevent oil bubbles from forming in the oil film.
If this occurs, re-apply immersion
oll,
for these bubbles greatly deterio-
rate the lens performance.
H After use carefully wipe off the immersion oil deposited on the lens
surfaces with gauze moistened
with xytene.
Never Imve oil an the lens
surfaces after use
as
oil remnants will seriously impair the performance
of
the lens system.
1. Swing
out the fop 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. Therefore, swing out the top lens of the condenser, using only
the loiver aperture of the lower condenser lens (N.A. 0.25).
2. Insert the analyzer into the light path. and attain the crossed filter
position with analyzer and polarizer at
0
setting.
At
this position, the
polarizer vibration is in thexdirection, and the analyzer vibration in they
direction. To open the filter position, pull out the analyzer rotation screw.
3. Rotate the stage until the extinction of the image is attained.
From this position,
it
is easy to rotate the stage slowly and to measure the
retardation angle.