3B SCIENTIFIC PHYSICS 500 1013146 Manuale di istruzioni - Pagina 2

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Illumination: Adjustable LED lighting integrated

in base, universal 85 to 265 V, 50/60 Hz power

supply

Condenser: Abbe condenser N.A.1.25 NA 0.65

with iris diaphragm , filter holder and blue filter,

focussed via rack and pinion drive

Dimensions: 306 x 190 x 407 mm³ approx.

Weight: 6.6 kg approx.

3. Unpacking and assembly

The microscope is packed in a molded styro-

foam container.

•

Take the container out of the carton remove

the tape and carefully lift the top half off the

container. Be careful not to let the optical

items (objectives and eyepieces) drop down.

•

To avoid condensation on the optical com-

ponents, leave the microscope in the original

packing to allow it to adjust to room tem-

perature.

•

Using both hands (one around the pillar and

one around the base), lift the microscope

from the container and put it on a stable

desk.

•

The objectives will be found within individual

protective vials. Install the objectives into the

microscope nosepiece from the lowest

magnification to the highest, in a clockwise

direction from the rear.

•

Put the head onto the top of the stand and

tighten the head-lock-screw. Insert the eye-

pieces into the tube.

4. Operation

4.1 General information

•

Set the microscope on a level table.

•

Place the object to be observed in the centre

of the specimen stage and clamp it to the

object guide.

•

Connect the mains cable to the net and turn

on the switch to get the object illuminated.

•

Make certain that the specimen is centered

over the opening in the stage.

•

Adjust the interpupillary distance so that one

circle of light can be seen.

•

Make the necessary eyepiece dioptre ad-

justments to suit your eyes.

•

To obtain a high contrast, adjust the back-

ground illumination by means of the iris dia-

phragm and the variable illumination control.

•

Rotate the nosepiece until the objective with

the lowest magnification is pointed at the

specimen. There is a definite "click" when

each objective is lined up properly.

NOTE: It is best to begin with the lowest power

objective. This is important to reveal general

structural details with the largest field of view

first. Than you may increase the magnification

as needed to reveal small details.

(oil) objective is chosen, objective oil must be

dripped onto the slide.

To determine the magnification at which you are

viewing a specimen, multiply the power of the

eyepiece by the power of the objective.

•

Adjust the holding brake to give a suitable

degree of tightness in the focusing mecha-

nism.

•

Adjust

the

coarse-focusing-knob

moves the stage up until the specimen is fo-

cused. Be careful that the objective does not

make contact with the slide at any time. This

may cause damage to the objective and/or

crack your slide.

•

Adjust the fine-focusing-knob to get the im-

age more sharp and more clear.

•

Colour filters may be inserted into the filter

holder for definition of specimen parts.

Swing the filter holder out and insert colour

filters.

•

Use the knobs of the mechanical stage to

move the slide side-, back- and forwards.

The vernier provides accurate location of the

specimen area.

•

Always turn off the light immediately after

use.

•

Be careful not to spill any liquids on the mi-

croscope.

•

Do not mishandle or impose unnecessary

force on the microscope.

•

Do not wipe the optics with your hands.

•

Do not attempt to service the microscope

yourself.

4.2 Using the polarisation equipment

•

Insert the analyser into the slot on the re-

volving nosepiece.

•

Place the polarising filter on the rim aperture

of the light source.

•

Rotate the polariser until the planes of the

polariser and the analyser are exactly

crossed, so that one sees a black back-

ground.

Any object with a doubly-refracting (birefringent)

structure should now appear brightly illuminated

against the dark background. If that does not

occur, it is possible that the direction of light

vibration of the object coincides with the polari-

sation direction. Whether or not that is the case

When 100x

which