10
3. 2 Focus adjustment
3.2.1
Adjusting the rotation tension of the focus
adjustment knob
(fig.13
fig.14)
For these Microscopes ,the tension has been
adjusted well before delivery.
1
．
Rotate the focus adjustment knob
①
to move
the slider
②
to a lower place for fear that the
zoom body drops down suddenly if the
tension is decreased too much.
2
．
Hold
the focus adjustment knobs
①
with both
hands, stop the left knob and rotate the right
knob to increase or decrease the focus knob
tension.
3. Brightness adjustment: the right brightness
adjustment knob
③
is used to adjust the
bottom illumination, and the left brightness
adjustment knob
④
is used to adjust the top
illumination
3.2.2 Adjusting tension collar
（
Fig.15
）
1. If the microscope body falls down by its own
weight or the focus obtained by fine
focusing is lost immediately, the rotation
tension adjustment may be too light. In this
case, rotate the tension collar with provided
spanner to increase the rotation tension
..
2. The brightness adjustment method is the same
as that of fig14
。
Spanner
Fig.15
⑤
图
7
②
①
②
Fig.13
③
④
Fig.14
,
