User's Manual

74
reticle.
Reticle Adjusting:
1. Rotate the instrument in face right position, turning horizontal tangent screw until
Hrƍ=Hr+C.
2.Loosen the shield of telescope’s reticle.
3. Adjusting 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:
1. When adjust 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.
2. After the reticle adjustment, it is necessary to adjust the vertical index error by
program.
5.7 Vertical Index Error
The deviation between vertical circle zero position and horizontal direction is vertical
index (i), it is necessary to concern this error when measure vertical angle. The instrument
program applied a formula to remove this error. This correction can offer the index for the
formula.
Warning: Before starting this operation, be sure to read 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 when adjust the vertical circle,
the value should be stable when reading.
1) Check:
Please adjust the reticle of telescope and correct the collimation error before this
operation.
(1) Mount the instrument at the tripod or a stable device and level it accurately, then turn
on the instrument.
(2) Aim at the cross-hairs of collimator or the obvious target at a distance, VA should be