Optika Italy B-510 Serie Manual De Instrucciones página 16

10.7 Coarse focus tension adjustment
• Adjust the tension using the provided tool.
• The coarse knob tension is pre-set in the factory.
1. To modify the tension according to personal's needs, rotate
the ring ① using the provided tool. (Fig. 23)
• Clockwise rotation increases the tension.
• If the tension is too loose, the stage could go lower by itself or
the focus easily lost after fine adjustment. In this case, rotate
the knob in order to increase the tension.
10.8 Coarse upper limit lever
The upper limit knob has two functions: prevent the contact
between slide and objective and acts as "focus memory".
1. After focusing the specimen, pull the lever ② toward the
front of the microscope and lock it. (Fig. 24)
• In this way the focus upper limit is set.
2. Now one can lower the stage with coarse focus knob, replace
the specimen and raise again the stage up to the upper limit:
specimen will be in approximate focus and will need a fine
adjustment to get the proper focus.
• Fine focus movement is not affected by the coarse
focus lock.
• To unlock, move the lever in the opposite direction to the
one used for the locking.
10.9 Stage
Stage accepts standard slides 26 x 76 mm, thickness 1,2 mm
with coverlside 0,17 mm.
It is possible to place two slides side by side on the stage.
• Open the spring arm of the slide holder
frontally the slides on the stage. (Fig. 25)
• Gently release the spring arm of the slide holder.
• A sudden release of the spring arm could cause the
falling of the slide.
10.10 Aperture diaphragm
• The Numerical Aperture (N.A.) value of the aperture
diaphragm affects the image contrast. Increasing or reducing
this value one can vary resolution, contrast and depth of
focus of the image.
• With low contrast specimens set the numerical aperture
④
value (printed on the condenser ring) to about 70%-80%
of the objective's N.A. (Fig. 26)
• Example: with objective PLAN 40x/0,65 set the scale to
0.65 x 0.8 = 0,52
③
and place
③
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②
LOCK
①
F ig. 23 F ig. 23
UNLOCK
F ig. 24 F ig. 24
F ig. 25 F ig. 25
④
F ig. 26 F ig. 26