NOTE: The adjustment can be performed by the program when C<30″, if C>30″, adjust the reticle.
III. Reticle adjustment
1. Rotate the instrument in face right position, turning horizontal tangent screw until:
2. Loosen the shield of telescope’s reticle.
3. Adjust two screws at left and at right until the vertical hairs of telescope’s reticle coincides with the cross-hairs
of collimator or target.
4. Repeat the check and adjustment procedure until the error is accepted.
NOTE:
• When adjusting the screws of reticle, firstly loosen the screw on the moving direction of reticle, secondly
tighten another screw by the same mount, clockwise turning is for tightening, and anticlockwise turning is for
loosening, the turning mount for tightening or loosening should be same.
• After the reticle adjustment, it is necessary to adjust the vertical index error by program, see 10.9. Vertical index
error.
10.9. Vertical index error
The deviation between vertical circle zero position and horizontal direction is vertical index (), it is necessary to
concern this error when measure vertical angle. The instrument program applied a formula to correct this error.
WARNING: Before starting this operation, be sure to read this manual carefully, otherwise it may cause data faulty.
Because of the close relationship between vertical index and compensator zero position, it is necessary to check and
adjust compensator zero position before adjusting vertical circle, the value should be stable when reading.
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