Bresser BioScience Mode D'emploi page 9

III. OBSERVING OPERATION
1. Turn the power switch down in or
illumination. The power switch also works as a brightness
control knob.
2. By tur ning the nosepiece, set the 10x objective into the
operation position. Then focus the specimen, which is on
the stage.
3. Adjust the interpupillary distance and the diopter (for
binocular observation).
4. Adjust the up & down position of the condenser , the light
control and the apertur
satisfying luminal effect. When you watch with the 4x or 10x
objective, bring down the condenser to get symmetrical
light. When you watch with the 4x objective, put the
auxiliary lens of condenser in observation position.
5. When you inter change objectives, tur n the nosepiece and
refocus slightly with the fine focusing knob. When you use
the 100x objective, be sur e to put a dr op of immersion oil
between the objective and the specimen as well as
between the condenser and the slide.
IV. THE OPERATIONS OF EACH UNIT
1. Adjustment of interpupillary distance (Fig. 4)
C
Put the specimen on the stage and bring it into the exact
focus. Adjust the interpupillary distance of the binocular
viewing by "folding" the binocular tube (1) on the optical head,
until the right and the left field of view can be composed to
one.
2. Adjustment of diopter (Fig. 4)
Put the specimen on the stage. T urn the 40x objective to the
working position. Firstly, observe at the right eyepiece with the
right eye; adjust the coarse and fine focusing knob to image
clearly. Secondly, observe at the left eyepiece with the left eye;
adjust the diopter control (2) to image clearly.
der to switch on the
e diaphragm in or der to get a
Fig. 4
3. Coarse/Fine focusing (Fig. 5)
B C D
The instrument uses a coaxial coarse/fine focusing
mechanism. The knob for tensional adjustment of focusing (4)
is used for adjusting the tension of the coarse focusing knob
(3) to pr event the stage fr om naturally sliding down. The limit
knob (1) pr events accidental contact between specimen and
objective. After locking the limit knob (by tur
fastening) at a chosen height of the stage, you cannot focus
the object closer to the objective using the coarse focusing
knob. So, the object is pr otected against damage. (2) is the
fine focusing knob.
4. Stage (Fig. 6)
B
B
The convenient specimen holder (1) on the stage is used for
holding the slide glass (2). The longitudinal (lengthwise)
adjustment knob (3) and the transversal (cr
knob (4) are coaxial. The stage moves expediently.
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Fig. 5
C D
Fig. 6
E
ning up and
E
oss) adjustment