NPZ TAL -2 Service Manual
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NPZ TAL -2 Service Manual

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TELESCOPE ТАЛ -2 (ТАЛ-2Т)
SERVICE MANUAL


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  • Page 1 TELESCOPE ТАЛ -2 (ТАЛ-2Т) SERVICE MANUAL...

  • Page 2: Table Of Contents

    CONTENTS Page . General directions 2. Specifications 3. Standard equipment 4. Design and principle of operation of telescope 5. Preparation for operation 5.. Telescope assembling 5.2. Telescope balancing 5.3. Precautionary measures 6. Order of operation 6.. Operation with telescope 6.2. Photographic observations 6.3.

  • Page 3: General Directions

    1. GENERAL DIRECTIONS ATTENTION! The telescope forms the inverted image like any astronomical instrument does. The direct observations of the Sun through the black light filter are permitted only with the use of a solar diaphragm. Telescope ТАЛ-2 (ТАЛ-2Т) (hereinafter in the text referred to as "telescope") is designed for visual observation of the celestial objects.

  • Page 4: Specifications

    2. SPECIFICATIONS Diameter of primary mirror 50mm Focal ratio Focal length 200mm Magnifications: -with the eyepiece of f'=40 mm -with the eyepiece of f'=25 mm -with the eyepiece of f'=7.5 mm -with the eyepiece of f'=40 mm and Barlow lens -with the use eyepiece of f'=25 mm and Barlow lens -with the eyepiece of f'=7.5 mm and Barlow lens Angular field of view of the telescope at magnification:...

  • Page 5: Standard Equipment

    3. STANDARD EQUIPMENT Name Telescope Supply unit Eyepiece of f'=40 mm Support Finderscope of 8x magnification Pier Tripod Equatorial mounting Bundled conductors Bracket Control panel Cable for car mains Accessories and Parts Reticle Barlow lens Eyepiece of f'=25 mm Eyepiece of f'=7.5 mm Yellow light filter Black light filter (solar) Blue light filter...

  • Page 6: Design And Principle Of Operation Of Telescope

    Name Screen (for observation of the Sun) Market Containers Housing Housing Service documents Service manual * Telescope can be completed with a metal pier (TAЛ-2) or tri pod (TAЛ-2T) ** Optional accessories 4. DESIGN AND PRINCIPLE OF OPERATION OF TELESCOPE The telescope consists of four basic units: the telescope tube, equatorial mounting, pier with supports or tripod, supply unit.
  • Page 7 Fig. . General view of telescope with metal pier:  - focusing mechanism; 2 - bushing; 3 - finderscope; 4 - ring; 5 - telescope tube; 6 - equatorial mounting; 7 - pier; 8 - bundled conductors; 9 - supply unit; 0 - cord;  - supports; 2 - control panel...
  • Page 8 Fig. 2. General view of telescope with tri pod: ,2 - stops; 3 - objects table...
  • Page 9 tube. The smoothness of the tube movement can be controlled. For this purpose the left handwheel is held by one hand and the right handwheel is rotated clockwise (with some effort) relative to the left handwheel by the other hand. The chosen position of the tube can be fixed in this way, if necessary.
  • Page 10 Fig. 5. Equatorial Mounting:  - folding clips; 2 - micrometer screw of slow-motion mechanism; 3 - declination axis; 4 - circle of declinations; 5 - counterweights; 6 - bolt; 7 - bracket with scale of latitudes; 8 - electric watch drive; 9 - handwheel of micrometer screw of polar axis;...
  • Page 11 declination is figured from 0 to 90° with a division value of °. Circle positioned on the polar axis (the circle of hour angles) is figured from 0 to 24 hours with a division value of 0 minutes. The declination axis has braking screw 2 and mechanism 2 of slow motion which moves the tube in the range of ±4°.
  • Page 12 Fig 6. Control Panel:  - indicator; 2 - speed selection buttons; 3 - correction buttons; 4 - lighting button; 5 - plug...
  • Page 13 Fig. 7. Optical train of telescope:  - primery mirror; 2 - eyepiece; 3 - diagonal mirror; 4 - finderscope...
  • Page 14 Focusing mount Eyepiece Focusing mount Eyepiece Barlow lens Fig. 8. Diagram of setting Barlow lens...

  • Page 15: Preparation For Operation 5

    5. PREPARATION FOR OPERATION 5.1. Telescope assembling Prior to assembling the units and parts should be cleaned from the slushing compound of the plant. The telescope is assembled in the following way. Three supports provided with captive screws are fixed to the lower end of the pier through holes.

  • Page 16: Telescope Balancing 6

    operates the indicator lights. The switch of autonomous operation on the mounting and the key of supply unit must be set into “I” position previously. 5.2. Telescope balancing For smooth motion of the telescope and reliable operation of the slow motion knob it is important to balance its movable parts on the axes of the equatorial mounting.
  • Page 18 Fig. 0. Watch drive:  - worm gear wheel; 2 - cap; 3 - screw; 4 - handwheel; 5 - screw; 6 - screw; 7 - motor; 8 - screw; 9 - worm with gear wheel; 0 - worm wheel;  - cap; 2 - screw; 3 - cover...

  • Page 19: Order Of Operation 9

    6. ORDER OF OPERATION 6.1. Operation with telescope Before mounting the telescope it is required to choose a place and prepare a site. It must be even and solid. Mount the telescope on the site and check it for reliable stability. For pointing to an object the telescope should be rotated about two axes.
  • Page 20 In the process of observation it is often required to perform minor corrections in the diurnal run of the telescope. For this purpose one makes use of handwheels 4 (fig. 0) or the buttons 3 (fig. 5) of the control panel.

  • Page 21: Photographic Observations

    telescope tube, the north end of the polar axis should be displaced to the West. If in the process of the star tracking the upper end of the telescope tube is lifted, the north end of the polar axis should be displaced to the East.

  • Page 22: Telescope And Atmospheric Conditions

    The exposures which are required for photographing the star fields are tenths of minutes without hindrance of the street lighting. Therefore, for this period of time one should see to it that the camera follows the sky precisely in its diurnal rotation. Near the centre of the field of view of the camera one chooses the bright star to which the telescope is pointed.

  • Page 23: Maintenance

    7. MAINTENANCE For faultless operation the telescope should be kept in cleanness and protected against mechanical damage. The metal surfaces are periodically dusted by using clean soft napkins, then wiped with a napkin impregnated with acidless vaseline, after that with a dry napkin.

  • Page 24: Possible Derangements And Methods Of Their Elimination

    8. POSSIBLE DERANGEMENTS AND METHODS OF THEIR ELIMINATION When manufacturing the telescope at the plant, the optical pieces are carefully set (adjusted), relative to each other. However, in case of transportation or considerable impacts of the telescope the optical pieces may be displaced (the adjustment is disturbed).
  • Page 25 The adjustment of the telescope is delicate and is carried out only in case, of emergency, when it is clear that the telescope is misadjusted and its mirrors and reflections from them are not concentric. Fig. . Setting concentricity of mirrors:  - inner diameter of focusing mount;...

  • Page 26: Rules Of Storage

    9. RULES OF STORAGE It is recommended practice to store the telescope in the case in the heated premises with relative humidity of maximum 80%, at air temperature from 5 to 40° C. The impacts and sharp shaking should be avoided. It is forbidden to store the telescope together with acids, alkalies, materials which liberate moisture or chemically-active gases and vapours.
  • Page 27 Supplement Table of close stellar pairs for testing image quality of the telescope Coordinates ang. Visible Name Magnitude, h, m degrees, distance, Constellations of star ang. min. ang. s. αPsc 59.4 3’ 4.3-5.3 .9’’ Pisces ° γCet 40.7 02’ 3.4-4.4 2.8’’...

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