User's Manual

12.5 PERPENDICULARITY BETWEEN SIGHT OF VIEW & HORIZONTAL AXIS

(2C)

Inspection

1. Set object A at a far distance at the same

height as the instrument, leveling the instrument

and turn on the power (eg. HL=10°13’10”).

2. Sight object A in horizontal left and read value

of HA. (eg. HR= 190°13’40”).

3. Loosen the vertical and horizontal tangent unit

and rotate the telescope. Sight object A in

horizontal right and read the HA.

4. 2C =HL-HR±180°=-30”≥±20”, overrange. So

it is necessary to adjust 2C.

Adjustment

1.Use the horizontal tangent screw to adjust the

reading of HA.

HR+C = 190°13’40” – 15” = 190°13’25”

2. Take off the cover of the reticle between the

eyepiece and focusing screw. Adjust the two

adjusting screws, loosening one screw and

tightening the other one. Move the reticle to

sight object A exactly.

3. Repeat inspection and adjustment until

|2C|<20”. Then replace the cover of the reticle.