Olympus CHA Buku Petunjuk - Halaman 13
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Halaman Cetak
Troubles
Causes
Remedies
bl
Dust
or
dirt is visible
in
Dust or dirt on the glass surface at
the field of view.
the light exit on the base.
Dust on condenser top lens.
Remove dust or dirt.
Dirty specimen.
Dust on eyepiece.
cl
Excessive image contrast.
Condenser is lowered excessively.
Raise the condenser.
Aperture iris diaphragm
is stopped
Open the diaphragm.
down excessively.
dl
Resolution problems:
Objective is not correctly position-
Slightly
rotate the nosepiece until
ed in the light path.
it clicks into position.
·
Image is not sharp.
·
Insufficient contrast.
Dirt on objective front lens.
Clean the objective.
·
Image
details
lack de-
finition.
Immersion objective is used
with-
Apply immersion oil.
out immersion oil.
Bubbles in the immersion oil.
Remove bubbles.
Olympus immersion oil is not used.
Use Olympus immersion oil.
Dirty specimen.
Dust
on
eyepieces and condenser
Clean.
top lens.
e) Field
of view is partially
Objective is not correctly position-
Slightly
rotate the nosepiece until
out of focus.
ed in the Iight path.
it clicks into position.
Specimen is not correctly position-
Place the specimen on the stage and
ed
on the stage.
secure it with the specimen holder
or stage clips.
f)
When objectives are
chang~
Mechanical tube length is not cor-
Adjust with the tube length adjust-
ed they are not parfocal.
rectly adjusted.
ment rings on the observation tube.
g) Light
intensity
does not
Condenser is lowered excessively.
Raise the condenser.
increase although the volt-
Rheostat trimmer screw is not cor-
Adjust it correctly.
age is raised.
rectlyadjusted.
2.
Electric System
a)
Illuminator
is too bright
Voltage
selector
switch
is not
Set the switch
to match the mains
(or too dark).
matched
with
the
mains
voltage
voltage.
(for CHA).
Mains voltage
is too high (or too
Adjust the
mains voltage with
a
low).
variable voltage transformer.
Rheostat trimmer screw is not cor-
Adjust it correctly.
rectly adjusted.
bl Output voltage for the 11-
Voltage
selector
switch
is not
Set the switch to match the mains
luminator cannot
be reg-
matched with
the
mains voltage
voltage.
ulated.
(for CHAI.
Mains voltage is too low (or too
Adjust the
mains voltage with
a
high).
variable voltage transformer.