11
through the eyepieces, tilt the
joystick to aim accurately at the
object for a sharp image.
4) Locking the base
When finishing the adjustment,
fasten the base locking screw (2) to
lock the base (4) and prevent it from
sliding.
Fig.24
3.4 Operation illumination unit-------------------------------------------------
1) Changing the slit width
Turn the slit width control knob (35)
and the slit width will be changed
from 0mm to 9mm. The slit
becomes a circle at the 9mm size.
The scale on the knob indicates the
width value approximately (Fig.25).
Fig.25
2) Changing the aperture and slit
height
Turn the aperture and slit height
control knob (29) and 6 different
circular beams of light are available
at full aperture: 9, 8, 5, 3, 1, 0.2 dia
respectively. With a slit image, the
slit
height
can
be
changed
continuously from 1 to 9mm, which
is indicated through the display
window (27) (Fig.26).
3) Rotating the slit image
Swing the aperture and slit height
control knob (29) horizontally to
revolve the slit image at any angle
in
the
vertical
or
horizontal
direction. The rotation angle scale
indicates the angle of image rotation
with small division for 5
o
and big
division for 10
o
(Fig.27)
.
Fig.26
Fig.27
4) Deflecting the illumination light
Loosen the centering knob (34) and
swing the slit width control knob
(35)
back and forth so the light spot
moves away from the center of the
microscope vision field. It is mainly
used to examine the eyes by indirect
retro-illumination.
Fasten
the
