Drawell B104 LED User Manual - Page 11

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immersion oil, otherwise, the image would be affected.

First of all, take 40X objective which has been focused well out from bright path,

then take 100X objective into bright path. At this time, nosepiece or stage

moving knob should be turned slightly, and also slightly turn fine focusing knob

to clear away the air bubble of immersion oil, otherwise, the air bubble would

affect the image badly.

▲After immersion oil used, the oil of specimen and the microscope surface

should be soon cleaned by absorbent cotton, lens paper, gauze or soft cotton

cloth with moderate mixture of pure industrial alcohol and ether (proportion 1:4)

▲Standard thickness 0.17mm cover glass should be chosen when high times

objective used, and thickness error should be within 0.01mm, otherwise, image

definition would be affected.

4.8 Mirror (Shown in Fig.4)

Mirror of B series microscope is optional, and it is used when electrical power

isn't supplied.

Mirror doesn't be suggested as illumination source when 100X objective used.

Take light collector down from base, then take mirror on base. Turn mirror to

make reflecting face to the light source, and make reflecting face and horizontal face

as 45°approximately to make the light to specimen as possible. The mirror has two

sides, one is a plane mirror, and the other one is a concave one. Concave mirror

is suitable for large-area outside light source, such as bright sky.

4.9 Points of attention after using

4.9.1 Power of microscope should be turned off after using, and the plug should