13
3-10
Selecting the Light Path of the trinocular Tube
1.
Slide the mirror selector lever
①
–Fig.27 towards your desired
observation method.
BF: Reflected light brightfield observation
DF: Reflected light darkfield observation
Make sure the selection lever is fully engaged into position.
3-11
Centring the Field Iris Diaphragm (FS)
1.
Slide the mirror selector lever
①
-Fig.27 to “BF”.
2.
Engage the 10X objective by rotating the revolving nosepiece,
place the specimen on the stage and adjust approximate
focusing.
3.
Pull out the FS knob
④
-Fig.27 on the reflected light illuminator
to reduce the aperture iris diaphragm.
4.
Rotate the two FS centring screws
②
-Fig.27 using the Allen
key to adjust so that the field iris image becomes concentric
within the field of view.
5.
While pushing in the FS control
④
-Fig.27, open the field iris
diaphragm until the field iris image inscribes the field of view. If
the image is found to be eccentric, adjust the centring again.
6.
Open the field iris so that its image is almost the same size as
(Fig. 28) the field of view.
Using the Field Iris Diaphragm
Observations in reflected brightfield light
The field iris diaphragm adjusts the illuminated area to obtain a
high contrast image.
Depending on the object in use, adjust the FS control
④
-Fig.27
of the reflected light illuminator until the iris image
circumscribes the field of view to block any unnecessary light.
Observations in reflected darkfield light
The field iris diaphragm must be opened by pushing in the FS
control.
①
②
③
④
⑤
Fig.27
Fig.28
Field iris diaphragm image
阑图象
Field of view of
eyepiece
