Topcon AP-L1A, Инструкция по эксплуатации

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17. CHECK AND ADJUSTMENT
17-6
17.3.3 Adjustment of the Vertical Cross-hair
Adjustment is required if the vertical cross-hair is not in a place perpendicular to the horizontal axis
of the telescope ( since it must be possible to use any point on the hair for measuring horizontal
angles or running lines).

Check

Set the instrument up the tripod and carefully level it.

Sight the cross-hairs on a well defined Point A at a distance of, at least, 50 meters ( 160ft.) .

Next swing the telescope vertically using the vertical jog and shuttle, and check whether the
point travels along the length of the vertical cross-hair.

If the point appears to move continuously on the hair, the vertical cross-hair lies in a plane
perpendicular to the horizontal axis ( and adjustment is not required ).

However, if the point appears to be displaced from the vertical cross-hair, as the telescope is
swung vertically, adjustment is required in the reticle plate.

Adjustment

Unscrew the cross-hair adjustment section cover, by revolving it in the counterclockwise
direction, and take it off. This will expose four eyepiece section attachment screws.

Loosen all four attachment screws slightly with the accessory screw-drive (while taking note of
the number of revolutions).
Then revolve the eyepiece section so that the vertical cross-hair coincides to Point A
e
.
Finally, re-tighten the four screws by the amount that they were loosened.

Check once more and if the point travels the entire length of the vertical cross-hair, further
adjustment is not required.
Note : Perform following adjustment after complete above adjustment .
Chapter 17.3.4 "Collimation of the Instrument", Chapter 17.3.6 "Adjustment of Vertical Angle
Zero Datum" , Chapter 17.5 "Inspection and Adjustment of Optic Axis for Auto -Tracking"
Eyepiece section
attachment screws
Eyepiece
Eyepiece section
attachment screws