Olympus CHA-P Manuale di istruzioni - Pagina 13

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Olympus CHA-P Manuale di istruzioni
7. Focusing
Mjusfment
1)
Tension
adjustment
of
coarse
adjustment
knobs
A
Wnsion
adjustment
ring
@
is
pmvidd
next
to
the
right
hand
coarse
adjustment
knob.
With
this
device
-r--l$
-
'
the
tension
of
the
maw
adjustment
is
freely
adjust-
able
for
either
heavy
or
light
movement
depending
on
1.
5;
operator
preferma.
(Fig.
7)
However,
do
not
l o o m
the
tension
adjustment
riw
too
much,
becausa
the
stage
drops,
or
the
fins
ad-
justment
knobs
slip
easily.
-
- -
.
t
Fig.
7
f
Be
carefut
not
to
mtate
the
right
and
I&
m r s a
adjustment
knobs
in
the
opposite
directions
simul-
tanerwdy.
2)
Pre-focusing
Iever
Crr
This
lewr
@
Is
locked
after
mars
focus
has
h n
aecompiistaed.
It
prevents
further
upward
travel
of
the
stqe
by
means
of
the
warse
adjustment
knobs,
and
automatically
provides
a
limiting
stop
if
the
stage
is
lowered
and
then
raised
again.
(Fig.
81
8.
Orthaseodc
Observation
Fig.
8
1)
Swing
out
the
top
lens
of
the
condenser.
In
princfple,
polarized
light
enters
the
light
path
paraitel
to
the
optical
axis,
to
enable
obsewatjon
of
the
optical
characteristics
of
the
m i m e n .
Howww,
this
method
will
darken
the
field
of
view
and
lower
the
resolving
power
of
the
objective
extremely.
Them
fore,
swing
out
the
top
bns
of
the
mndenser,
using
only
the
lawer
aperture
of
the
lower
cundenser
lens.
2)
Insert
the analyzer into
the
light path, and attain crossed filaer position
with analymr
and
polarizer
at
o0
setting.
At
this posltion, the polarizer vibration is in the
nortbouth
direction, and
the
analyzer vibration in the
east-west
direction. To open the f i k posi-
tion, pull out the analyzer roQtion
m .
3 ) Rotate
the
stage
until extinction of the image
i s
attained.
From this position, rotate the
by
45'
to
obtain the diwnal posi'tion, at which
position, the retardation angle is m u r e d .