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Levenhuk
Микроскоп
700m
Инструкция по эксплуатации Страница: 4

Levenhuk 700m [4/12] Page 4

Operating principle and illumination

Image creation system: objective (6), prism (7) and eyepiece (9). The

objective lens (6) magnifies a specimen (0), light rays pass through the prism

(7), refract at a 45° angle and create an image in the eyepiece. Total

magnification may be calculated by multiplying magnifications of the

eyepiece and the objective used.

Using the microscope

Getting started

Unpack the microscope and make sure all parts are available.

Move the stage to the lowermost position using the focusing knob and turn on the illumination or

adjust the reflector to evenly illuminate the specimen within the field of view.

Connect the microscope to A/C power using the A/C adapter.

Insert the eyepiece into the eyepiece tube.

Slowly adjust the illumination brightness, from dark to light. When you finish your observations,

always dim the illumination before unplugging the power cable.

If you need to change the light bulb, unplug your microscope first.

Illumination system: lamp (1), collector lens (2), diaphragm (3) and

condenser (4). Light emitted from the lamp (1) passes through the collector

lens (2) and illuminates the diaphragm (3). Then, the light is focused by the

condenser (4). This illumination system is used for observations of a

specimen (0) in transmitted light. You can also use a different type of

illumination (e.g. a reflector) for observations in reflected light.

Focusing

Place a specimen on the stage and fix it with the holders.

Select the 4x objective rotating the revolving nosepiece.

Center the observed specimen in the field of view.

Rotate the focusing knob to slowly raise the stage until the objective is close to the specimen;

keep checking the distance between the objective and the object to avoid their contact.

CAUTION: The objective should not touch the specimen, otherwise the objective or/and the

specimen might be damaged.

Look through the installed eyepiece and lower the stage slowly rotating the focusing knob until

you see the sharp image of the observed specimen.

Such adjustment protects the frontal lens from contacting the object when you use objectives

of other magnifications; though, slight refocusing might be required.

If the image is too bright, adjust the diaphragm disk until the passing light ray is reduced to a

comfortable brightness level. If the image is too dark, increase the light ray.

Selecting the objective

Start your observations with the lowest magnification objective (4x) and select a specimen

segment for detailed research. Then move the specimen to center the selected segment in the

field of view, to make sure it keeps centered when the objective is changed to a more powerful

one. Once the segment is selected, you should center its image in the microscope's field of view

as precisely as possible. Otherwise, the desired segment might fail to center in the field of view

of the higher power objective.

Now you can switch to a more powerful objective by rotating the revolving nosepiece. Adjust

the image focus, the iris diaphragm and the illumination brightness if required.

When using a 100x objective lens, you have to fill the space between the lens and the specimen

with immersion oil. There should be no air bubbles in the oil, as they might reduce the resulting

quality of the image. You must wipe the 100x objective clear after using it.

Levenhuk 700m [4/12] Page 4

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