Olympus CHA Manuel d'instruction - Page 9
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Fig. 1
V.
OPERATION
•
Summary of Putting the Microscope in Operation
1.
Match the line voltage selector switch to local mains voltage (for CHAI. (See
page 5,)
2. Switch on the light source.
3. Adjust the trimmer screw. (See page 7.1
4. Place a specimen slide on the stage. (See page
7.)
5. Loosen the automatic pre-focusing lever.
6. Coarse focus with a low power objective.
7. Make interpupillary and diopter adjustments. ISee page 8.)
8. Swing in the desired objective.
9. Adjust light intensity.
10.
Fine focus.
11.
Lock the automatic pre-focusing lever. (See page 8.1
12.
Adjust the aperture iris diaphragm. ISee page 9.1
A. Adjustment of Minimum Line Voltage (CHA)
The minimum voltage required for the ligh
t
source can be adjusted with the rheostat
trimmer screw at the microscope base plate in accordance with the line voltage and
frequency.
The built·in rheostat incorporates a thyristor in its semi-conductor circuit for the following
advantages:
(a) Extremely fine adjustment of light intensity can be easily achieved.
(bl Flickering of the bulb filament is eliminated and the light intensity is stabilized.
Icl Increased life expectancy of the bulb.
For adjustment of the minimum line voltage, ascertain
that the voltage selector switch is set to conform with
the local mains voltage, and the sliding control lever
CV
is positioned closest to you (low voltage). and then
activate the main switch
CD.
If the bulb is dimly lit,
the secondary VOltage is correct. If it is not lit at all,
rotate the rheostat trimmer screw
@
gradually with a
coin, until the bulb is dimly lit; then push the sliding
control lever forward in order to obtain optimum light
intensity. (Fig.
1)
8.
Placing a Specimen Slide on the Stage
NOTE:
1) Cover glass:
Olympus objectives with an engraving "0.17" are corrected for
use with cover glasses of 0.17mm thickness (No. 1%).
2) Specimen slide:
It is recommended to use specimen slides of O.8mm to 1.5mm
thickness.
However, for use with the immersion darkfield condenser
BH-DCW (optionally availablel. a specimen slide between
O.8mm to 1.2m m th ickness is preferable.
7