LEITZ DIALUX 20 - Preparing the Microscope for Operation; Changing the Lamps in the DIALUX 20 EB

Changing the Lamps in the DIALUX 20 EB
23181-514R
Fi g. 26
Pulling out th e EB lamp mount
Fig.
27
Inserting a new lamp
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23022-5 12 A
Fig. 28
Inse rting th e lamp mount
Pull the lamp mount out of the fo ot of
the stand. Remove the defective
lamp
In sert new tungsten halogen lamp t o-
gether with its protective cover , whi ch
should be removed only after insertion .
Replace the lamp mount in the foot of
the stand.
.. .
4
preparing the microscope for operation
Fig. 29
Fig. 30
....
. liE_
Fig. 31
22972-512 A
Switch on the microscope illumination.
Mount the specimen with object holder
on the ob j ect stage.
The cl amping of the specimen is ad-
just able: push the button (Fig. 29,
arrow) on the pivot of the specimen
holder , push it to the left for firmer , to
the right for less firm clamping and let
it click in position.
For initial observation choose an ob-
jective of medium magnification (e.g.
NPL FLUOTAR 16 /0.40).
Give the screw (1 . 17) about 5 anticlock-
wise turns and fully raise the condenser
with knurled screw (1.15).
Turn the condenser top in. Open the
aperture diaphragm (10 /11.4) and the
field diaphragm (1.18).
When the
binocular observation tube S
(Fig. 30) is used, carry out interpupil-
lary distance adjustment (by pulling or
pushing) so that both images are co-
incident (only one circular image is
seen).
Transfer the interpupillary dis-
tance determined (scale on the front
plate of the tube) to the two eyepiece
tubes - e.g.
with a 65mm interpupillar
distance set the two eyepiece tubes
each at their "65" mark (Fig. 31).
Carry
out the following corrections for
defective vision:
Look through the right-hand eyepiece
with
your right eye and focus the spe-
cimen with the fine adjustment.
Now
l ook at the same area of the specimen
through the left-hand eyepiece with
your left eye and aga in focus the spe-
cimen by rotating the
left-hand eye-
piece
tube - do not use the fine ad-
justment. Check this
setting finally after
centration of the condenser.
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