6
Ⅴ.OPERATION
1
．
Illumination
Turn the brightness adjustment knob & the main switch until you obtain the needed
brightness. The illumination brightness is decided by kinds of conditions, for example, the contrast
of specimen, the magnification of objective, the adjust ability of the eyes and soon. Too weak or
too intensive light is not correct. Generally, please don't adjust the brightness onto the highest state,
or the bulb service life will be shortened for full load working.
2
．
Focus
When observing, use the 10×objective to focus. To avoid the objective touch the specimen,
please rise the stage up to let the objective near the specimen at first, by rotating the coarse focus
knob, then looking into the eyepiece and reversing the coarse knob slowly in the same time until
you find a image, then turn the fine focus knob to obtain a sharp image. Following above steps,
you can change the magnification free and focus on the specimen with no risk of destroying.
The tightness of the tension adjustment collar has adjusted before leaving factory, if finding
it’s very loose (the mechanical stage drop itself because of deadweight), please turning the tension
adjustment collar until the tightness is in order.
3
．
Adjusting the stage and the objective optical axis coincident with each other: The nosepiece
is center adjustable, the objective optical axis and stage has been pre-adjusted coincident at the
factory, and should not require readjustment.
If they are not coincide accurately, please adjust it follow the bellow steps: First, focus on the
specimen, find a visibly target point in the viewing field, and move it to the crossing point of
ocular, rotate the stage, if the stage deviated from the center of the objective optical axis, the
target point will rotate around the mechanical center of stage. The trail is a circle. According to
the target point's trail, you can find the move regular. Adjust the centering bolts on the nosepiece,
to move the objective optical axis into the center of mechanical stage, let them overlap
completely. Then rotate the stage again, observe the two points and note them whether keep
coincident with all the time ( Is the target point moving?). If moving, repeating the adjustment
until the target point stay still.
s
4
．
Focusing the condenser
：
（
1
）
The highest position of condenser has been pre-adjusted at the factory, and should not
require readjustment.
（
2
）
Turn the condenser focus knob to shift the condenser. It need to raise the condenser
when using the high magnification objective, and to decline when using the low
magnification one.
（
3
）
Adjusting the aperture diaphragm (iris diaphragm):
·The aperture diaphragm (iris diaphragm) is designed for matching the objective's numerical
