Centering Of 12V-S0W Halogen Lamp - Nikon Epiphot 300 Manual

3. Centering of 12V-S0\V Halogen Lamp
When using 12V-50W halogen lamps, center it as described below. When 12V-100W
halogen lamps is used, proceed to the next section since it doesn't need centering.
( 1) Push the mirror block changeover lever to put the brightfield mirror block in the
optical path.
(2) Push both the OB/PHOTO•SIDE and OB/PHOTO changeover levers to provide the
binocular eyepieces with 100% light output.
(3) Tum on the power switch of the power supply unit. Rotate its lamp intensity control
dial to CTRL. Set the lamp intensity control dial of the microscope base at about 6V.
(4) If a Nomarski prism, the polarizer and the analyzer are in the optical path, remove
them from the optical path.
(5) Fully open the aperture and field diaphragms.
(6) Rotate the revolving nosepiece to switch to the IOx objective.
Rotate the stage movement knobs to locate the center of the opening in the stage ring
almost right above the top of that objective.
(7) Place a flat, high reflectance sample on the stage. Face its surface to be observed
downward.
(8) Rotate the coarse focus and fine focus knobs to focus on the sample.
Stop down the field diaphragm to make the field diaphragm image clearly visible.
This makes focusing easier.
(9) Loosen the eyepiece tube clamp screw to tum the eyepiece tube to the left. Tighten
the clamp screw to fix the eyepiece tube. (If the operator can easily reach the
lamphouse from the front of the microscope while looking into the eyepiece facing
front, it is not necessary to change the direction of the eyepiece tube.)
(10) Remove one of the binocular eyepieces to view the viewfield through the eyepiece
sleeve. The objective's exit pupil is visible there as a bright circle. Also visible there
is the diffuser plate built in the illuminator.
( 11) Loosen the lamp house clamp screw to move the
lamphouse slowly back or forth. Fix the
lamphouse at the point where the filament image
of the lamp is sharply formed on the diffuser
plate.
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