Centering The Episcopic Aperture Diaphragm - Nikon ECLIPSE L200ND / ECLIPSE L200N Instructions Manual

If your sample is of low reflectance and observed under episcopic illumination, you may not
be able to see the aperture diaphragm image. In this case, replace the sample with of
higher reflectance.

3.6.2 Centering the episcopic aperture diaphragm

On normal usage, there is no need to center the episcopic aperture diaphragm since it is
already centered at the factory. If you need very precise centering or off-centered
diaphragm (such as for diagonal illumination), the position of the aperture diaphragm can be
shifted.
Center the episcopic aperture diaphragm using two aperture diaphragm centering screw
holes at the back of the filter slider on the left side arm.
1.
Remove the caps of the centering screw holes and insert the hexagonal screwdrivers in
the centering screw holes.
You can look in the holes to find the centering screw heads.
2.
Remove one eyepiece from the microscope and look inside the open sleeve to find the
image of the aperture diaphragm. Turn the centering screws to match the two centers of
the exit pupil of the objective and the image of the aperture diaphragm in the same
manner as adjusting the size of the aperture diaphragm.
Figure-20 Centering the episcopic aperture diaphragm
For precise centering, using a centering telescope (optional) is recommended with which you
can see the exit pupil of the objective much easier.
3 Operation of Each Part
Tools required: hexagonal screwdriver (2 mm) × 2
Image of the aperture
diaphragm
Exit pupil of the
objective
Match two
centers
18
IC Inspection Microscope ECLIPSE L200ND / L200N Instructions
Aperture diaphragm
centering screw holes