Newcon Optik YUNNAT-2P-3 operation manual Purpose, Standard Equipment

PURPOSE

The microscope is intended for observation of the transparent specimens by transmitted light against a bright field in taking up natural sciences in schools or other educational establishments as well as for various researches in laboratory practice.

STANDARD EQUIPMENT

Microscope with zoom eye-piece and objective lenses:………………………………………………….1

8x …………………………………………………….…………..…1

20×…………………………………………………………………….1

40x……………………………………………………………………1

Wrench ………………………………………………………………1

Napkin .……………………………………………………………..1

Slide ..………………………………………………………………3

Cover ..………………………………………………………………1

Packing case …………………………………………………………1

Certificate ………………………………………………………….1

SPECIFICATIONS

Magnification ……………………………………………...80x-160x, 200x-400x, 400x-800x

Field of view .mm ……..……………………………………………………………….0.2-2.0

Achromatic lenses ………………………………………………….8x0.20, 20x0.40, 40x0.60

Zoom eye piece ………………………………………………………………………10x-20x

Weight, kg, max ……………………………………………………………………………1.4

Overall dimensions, mm, max ……………………………………………………11x150x340

DESIGN

In transmitted-light mode of operation a beam reflected from a concave mirror and passed through a diaphragm and a microscope slide illuminates the transparent specimen covered with a cover glass. Lenses 8x or 20x form an image of the specimen in the focal plane of the zoom eyepiece. The microscope magnification is the product of the objective magnification and the eyepiece magnification. The microscope consists of the following main parts: a base , a drawtube holder bracket, a specimen stage with a tilting mechanism, a turret with lenses, a drawtube with a zoom eye-piece. N o t e : Since efforts are continually made to improve the reliability and performance of the microscope minor changes may be introduced in its design without special notice in this Manual.

PREPARING FOR OPERATION

After transportation (or storage) at low temperatures the packaged microscope should be kept indoors at a temperature of 20±5°C for at least 4 hours.

Unpack the microscope; screw the drawtube into the drawtube holder and the instrument is ready for operation.

OPERATING PROCEDURE

Install the microscope on the working table with its stage arranged from you. Tilt the drawtube holder to a position suitable for operation. The force to be applied for turning if required is adjusted by tightening the hinge using the wrench furnished in the standard equipment. Since the quality of the image in the microscope depends to a great extent on lighting the adjustment of the lighting is an important preparatory operation. Light from a source should illuminate the mirror uniformly and be directed by the latter through the diaphragm onto the specimen. Turn the mirror until a field of view becomes uniformly illuminated. The focusing is performed by rotating the handwheels (knobs). Turn the knobs to lower the stage place the specimen under study onto it and lock with clamps. Elevate the stage to look into the eye-piece until the specimen image will appear. When focusing it is good practice to carefully move the object under study, since it is easier to trace a moving image than a fixed one. Having found the image achieve the most sharply defined image of the object through even slower rotation of the knobs. Having caught the object in the observation field ( in focusing ) try to vary the lighting by changing the mirror tilt. As often happens, the object poorly seen in direct light is clearly seen under skew rays. Sometimes, the object is better seen in weak lighting. In such case it is a sound practice to use the diaphragm. The adjustable stop limiting the stage motion is adjusted with allowance for the following dimensions: 1-1.9 mm-thick slide and 0.17 mm thick cover glass. Here, the stop provides a gap between the lens body and the cover glass surface. At specimen’s thickness differing from that of the described above, the focusing should be performed with a great care, since the working state for objective lens 20x is 1.8 mm.

After changing the lenses or varying the eyepiece magnification it is necessary to perform the additional focusing. To view the object in the microscope ultimately with a left or right eyes, leave one eye opened to prevent it from getting tired.

OPERATING INSTRUCTIONS

The microscope offers a trouble-free operation for a long time, provided it is kept clean and adequately protected against mechanical damages with the operating instructions strictly observed.

Keep the napkins for attending the microscope clean. Thoroughly remove dust and fluids that get onto the microscope during operation. Protect the microscope against deposition of dust on the drawtube internal surface and on the objective internal lenses. Never touch the lens surfaces with fingers. To clean the lens external surface from dust use a soft napkin or a soft brush. If after removing the dust the lens surface still remains insufficiently clean, then wipe it with a napkin slightly moistened with alcohol or ester. Dust from the surface of the lens seated deeply in the mount should be removed with cotton turned onto a wooden stick. Having noticed that the lubricant in the microscope movable parts gets strongly thickened wipe the rubbing surfaces with gasoline and a clean napkin then lubricate them with an acid-free lubricant. It is not recommended to frequently unscrew the drawtube from the drawtube holder to avoid damage to the thread. Never disassemble the lenses since they may become faulty. Having accomplished operations with the microscope, lower the specimen stage, remove the specimen and cover the microscope with a cover available in the set of the standard equipment.