Fig.19
Fig.20
N125-DE
11
3.2.4 Condenser Adjustment（Fig.19）
Turn the condenser focus knob①to move the
condenser up and down.Raise the condenser when
using the high magnification objective, and descend
it when using the low magnification one.
★ The condenser and the objectiveare coaxial.
It has been adjusted before leaving factory,
so the user needn’t to adjust them by self
★ The highest position of the condenser has
been adjusted too. It also needn’t any user’
s operation. (The top surface of the condenser
is 0.03mm-0.4mm lower than the stage top
surface.)
★ The aperture iris diaphragm is designed for
the adjustment of the numerical aperture,not
for the brightness.
Generally, setting the aperture iris diaphragm
to 70- 80% of the N.A. of the objective in use will
provide an image with good contrast.If you want
to observe the image of the aperture iris diaphragm,
remove one eyepieceand look through the tube.
You will see a dark circle encroaching on the
bottom of the tube.
3.2.5 Aperture Iris Diaphragm Adjustment
（Fig.20）
Turn the aperture iris diaphragm stick①to adjust the
aperture iris diaphragm.
②
①
①
1. Focus the specimen with 10× objective.
2. Adjust the condenser focus knob①to get a clear
image of the field iris diaphragm.
3. Turn the condenser centering knobs②to center the
image of field iris diaphragm in the field of view.
