Aperture Diaphragm - Gima L1200B Bedienungsanleitung

15
fig. 8
fig. 9
fig. 10
ENGLISH
5. Elevated condenser
The condenser is moved up or down via turning up-
down knob . The condenser can be taken down easily
if unscrews the condenser holding screw , filter plate
places on the filter seat. (Fig.8)
6. Power switch and adjustable brightness
Turn on the power switch , adjust the light control 
until image can be observed comfortably.
Note: Don't let the light control at the lightest posi-
tion so long that reducing the life-span of the lamp.
(Fig.8)
7. Adjusting of field diaphragm (optional)
Switch on the power, put the specimen on the stage,
then turn the 10X objective into the working position,
observe with 10X eyepieces. Turning the up/down con-
denser knob and reach the image of field diaphragm.
Then concenter field diaphragm and optical axis with
adjusting screw . Turn the ring  of field diaphragm
when the field diaphragm more than the field of eye-
piece. Using 4X objective, the adjust method as so.
(Fig.9)

8. Aperture diaphragm

The aperture diaphragm lever  can be turn to adjust
NA of the illuminal system (Fig.8).Removing the eye-
pieces, watch through the eyepiece tube, adjusting
screw is used while the diaphragm image is eccentric
with the objective pupil . Turn the aperture diaphragm
for getting an image with advisable contrast. Usually,
adjusting diameter of the aperture diaphragm image 
to 70-80 percent of the objective pupil can get it. (Fig.10)