Olympus BHT Manual de instrucciones - Página 15
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Focus Adjustment
Tension of Coarse Adjustment Knobs and
Fine Adjustment.
Although the tension of the coarse adjust-
ment knobs has been already adjusted for
optimum performance by the manufacturer,
'3
'i
i t is possible t o personally adjust the tension
of the coarse adjustment for either heavy or
light movement depending on the operator's
la
r r
preference by rotating the tension adjust-
ment ring
@.
(Fig.
17)
Fig. 17
The ring can be rotated by inserting a screwdriver into one of the holes on the periphery of
the ring. The clockwise rotation (in the direction of the arrow) tightens the coarse adjust-
ment knobs. Do not loosen the ring too much, because the stage may drop or the fine
adjustment knobs may slip.
NOTE: Do not rotate the right and left coarse adjustment knobs in the opposite directions
simultaneously. If the stage drops and the specimen goes out of focus, the tension
adjustment ring is too loose. Tighten the ring.
I
Use of Rubber Cap for Fine Adjustment Knob
I
-b
Attaching
this
cap
over
the
fine
adjustment
knob
increases
the
sensitivity
of
the
fine
focus-
ing
motion.
(The
rubber
cap
is
optionally
avail-
able.)
2 .
Pre-Focusing Lever
This lever
@
is provided to prevent possible
contact between specimen and objective as
well a s to simplify coarse focusing. (Fig.
18)
The lever is locked after coarse focus has
been accomplished. This prevents further
upward travel of the stage by means of the
coarse adjustment knobs, and automatically
provides a limiting stop if thestage is lowered
and then raised again. The pre-focusing lever
Fig.
10
does
not
restrict
fine
focusing.
3.
Adjustment
of
Stage
Block Height
In
addition
to
the
vertical
movement
of
the
stage
by
means
of
coarse
and
fine
adjust-
ments,
the
stage
block
height
can
be
changed
for
observation
of
specimens
'which
are
thlcker
than
standard
slides,
e.g.
chambers,
flasks,
etc.
with
much
larger
thickness.
The
stage block
height
can
be
adjusted
b y
loosening
the
stage
block
locking
screw
@
Fig.
19
with
the
Allen
wrench
provided
and
retightening
i t
at
the
upper
position.
Then,
dislocate
the
lower
limit
stop
pin
beneath
the
stage
block
into
a
lower
tapped
hole.
After
lowering
the
stage
block,
reclamp
the
stage
block
locking
screw
a.
(Fig.
19)