7
aperture, not use for adjusting brightness. Usually, for most specimen, it can be obtained a
good , enough contrast image if reducing the diaphragm opening to 70- 80% of the N.A. of
the objective in use.
·Adjusting the center of the aperture diaphragm (iris diaphragm):
The center of the condenser's aperture diaphragm(iris diaphragm) has been pre-adjusted at
the factory, and should not require readjustment. Push the Bertrand lens in or take away the
ocular, look into the tube, you will see a bright circle. Changing the diaphragm opening
slowly, you can observe the circle is changed coaxially.
5
．
Orthogonal polarized light viewing
：
(1)When the polarizer is in the center of the optical path, its polarized direction is east-west at
0°.The analyzer is located in the center of the optical path all the time, and marked with0°-
90° graduation. Swing the analyzer lever, let the graduation center to the 90° scale line. So
the two polarized prism is orthogonal exactly. That means the polarized direction of the
polarizer is east-west, and the direction of the analyzer is south-north.
(2)When the polarizer is get out of the optical path, the analyzer will still stay in the center of
the optical path. The instrument is in the single polarizing observation.
6
．
Convergent light observation
：
The convergent light observation is often use the high magnification objective. Under the
orthogonal polarized light state, push in the bertrand lens, and rise up the condenser, then you
can observe the convergent light performance of the specimen.
7
．
Optical Compensator:
Constant optical compensator just like1/4λ, λ slip and quartz wedge variable optical
compensator is equipped. After the specimen focus, separately insert 1/4λ slip (micaceous), λ
slip (gypsum) and quartz wedge into the slot under the analyzer at 45°, and you can observe
first class gray interferogram, first class red interferogram and the Ⅳ class avriable optical
interferogram of the specimen correspondingly.
8
．
Adjusting the illumination system
：
The illumination has been pre-adjusted at the factory. If need to change the lamp, please
follow the bellow step: First, pull out the button under the base, and carry down the bulb,
replace it with a new one. Second, loose the light source adjusting bolt, and adjust the
filament into the center of the viewing field, then screw down the bolt, so you have a best
illumination environment for observation..
Ⅵ.MAINTENANCE
1
．
Carefully open the box, avoid the accessories dropping to ground and being damaged,
for example, the lens.
2
．
All the lenses have been well checked and adjusted. it is forbidden to disassembly them
by yourself.
3
．
The nosepiece and coarse/fine focus unit have a compact and precise frame, please don’t
disassembly them as possible as you can.
4
．
Keep the instruction clean, wipe dust regularly. Pay attention to avoid contaminating the
optical elements especially.
5
．
Place the instruction in a cool, dry position, when end use the microscope, remember to
