Page 13
10.8 Centering the condenser
•
The condenser is mounted and pre-centered before ship
-
ment from the factory.
•
To remove the condenser, use a 1.5 mm Allen key and turn
the fixing screw on the right-hand side of the condenser hold
-
er.
If re-centering is necessary, proceed as follow:
1.
Insert the 5x objective into the optical path (if the 5x objective
is not available, use the lower magnification objective).
2.
Focus the specimen.
3.
Close the aperture diaphragm using the
①
dial, moving the
dial towards the “4” value for the 5X objective. (Fig. 17)
4.
Raise the condenser to the end of its travel by turning the
condenser height adjustment screw
②
on the left side of the
condenser holder.
5.
Centre the condenser using the centering screws
③
until the
field of view is evenly lit (no lighter or darker areas within the
field of view).
6.
Then open the diaphragm completely.
10.9 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.
1.
Move the aperture ring
①
(Fig. 18) to the value corresponding
to the objective in use. You can move the dial to lower or
higher values to adjust the observation to your preference.
•
With low contrast specimens set the numerical aperture
value (printed on the condenser ring) to about 70%-80% of
the objective’s N.A. If necessary, remove on eyepiece and,
looking into empty sleeve, adjust the condenser’s ring in
order to obtain an image like the one in fig. 19.
F
Fig. 18
ig. 18
①
F
Fig. 17
ig. 17
③
①
②
30-20%
F
Fig. 19
ig. 19
FIELD OF VIEW
APERTURE
DIAPHRAGM
70-80%
Содержание B-383 Series
Страница 1: ...Ver 2 1 2022 INSTRUCTION MANUAL B 383 Series Model B 383MET...
Страница 24: ...Modello B 383MET Serie B 380 MANUALE DI ISTRUZIONI Ver 2 1 2022...
Страница 47: ...Ver 2 1 2022 MANUAL DE INSTRUCCIONES Modelo B 383MET Serie B 383...
Страница 70: ...Ver 2 1 2022 MANUEL D UTILISATION Mod le B 383MET Serie B 380...
Страница 93: ...Ver 2 1 2022 BEDIENUNGSANLEITUNG Serie B 383 Modell B 383MET...
Страница 116: ...Ver 2 1 2022 MANUAL DE INSTRU ES Modelo B 383MET S rie B 383...