10
BM-300
3.2 Adjustment and Operation
3.2.1 Brightness Adjustment
（
Fig.16
）
1.
Connect the power cord and set the main switch to
“
－
”state (ON).
2.
Turning the brightness adjustment knob clockwise, the
voltage raise, and the brightness strengthen; whereas
turning at the contra direction, the voltage decline, and
the brightness weaken.
2.T
Using the microscope with low voltage in the voltage
range can prolong the service life of the bulb.
3.3.2 Placing the Specimen
（
Fig.17
）
1. Place the specimen in the center of the mechanical
stage and use the stage clips to clamp it.
2. Turn the portrait and lateral adjustment
knob
②
of the mechanical ruler, move the specimen to the
required position.
Be careful when changing the objective. If you
finish the observation with the short working distance
objective, and want to change another one, be careful of
not letting the objective touch the specimen.
3.3.3 Focusing the Specimen
（
Fig.18
）
1. Focus the specimen with 10X objective. To avoid the
objective touching the specimen during focusing, you
should raise the mechanical stage to let the specimen close
to the objective at first, then slowly separate them to bring
the specimen to focus.
Fig.13
Fig.15
Fig.14
