Olympus BHTP 200 Manuel d'instruction - Page 16
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When
the top
lens of
the polarizing condenser is swung
out
for
orthoscopic obewatbn, the aperture iris diaphmgm serves
as
a fidd iris
diaphragm and the
field Iris diaphragm as
an
apertuw I r i s
ditlaphr&grn.
For conoscopic observatlon, generally the apeflu# iris
diaphragm
is
fully
opened and the
fiild irk diaphragm can be effectively
used far
mduction of glare and conoscopic observation of very
small
objects.
1. APERTURE IRIS
DIAPHRAGM
Adjust the opening of the aperture iris diaphragm according to
the
various wnditions such as the numerical aperture of the objective,
image contrast, depth of focus, and flatness of field. Generally
it
is
often
preferable to stop
down
the apertureirisdiaphragm to
about
70% at 80%
of the N.A. of
the
objective.
After the
eyepiece
I s
removed from
the
observation
tube,
if
necessary,
look through the 0bServati~n tube and check the
opening
ofthe
aperture
diaphragm at
the
objectivs pupil.
2. FIELI3 IRIS DIAPHRAGM
me
field iris diaphragm controls the
diameter of
the ray bundle imping-
ing on the specimen surface and thus increases image definition.
Generally, it is preferable to slightly open the field
iris
diaphragm until it is
just
outside
the field
of
view.
Frn
75
1.
TENSION
OF
COARSE
ADJUSTMENT
KNOBS
AND
FINE
ADJUST-
.
'3
1
Y
MENT
Although
the
tension
of
the
coarse
adjustment
knobs
has
already
been
adjusted
far
optimum
performance
by
the
manufacturer,
it
is
possible
to
I
adjust
the
tension
of
the
coarse
adjustment
for
either
heavy
or
light
mwement
depending
on
the
operator's
personal
preference
by
rotating
the
tension
adjustment
ring
B
(Flg.
15)
The
ring
can
be
rotated
by
inserting
a
screwdriver
into
one
of
the
holes
on
the
periphery
of
the
rlng.
1
The
clockwise
rotation
(in
the
direction
of
the
arrow)
tightens
the
coarse
adjustment
knobs.
Do
nd
loosen
the
ring
too
much,
because
the
stage
may
drop
or
the
fine
adjustment
knobs
may
slip.
Fig.
16
NOTE: Do not rotate the right and left coarse adjustment knobs in the
opposite directions simultaneously, If the stage drops and the specimen
goeg
out
o f
focus,
the
tension adjustment ring
is too
loose. Tighten the
-
-9
ring.
t
2.
PRE-MCUSIF~G
LEVER
This
lever
El
is
pmided
to
prevent
possible
contact
between
specimen
and
objecfi*
as
well
as
to
simplify
coarse
focusing.
(fig.
16)
The
lever
is
locked
after
coarse
focus
has
been
accomplished.
This
prevents
further
upward
travel
of
fhe
stage
by
means
of
the
coarse
adjustment
knob,
and
automatically
pmides
a
limiting
stop
if
the
stage
i s
lowered
and
then
raised
sgain.
The
pre-focusing
l m r
d m
not
restrid fine
focusing.
14