Vertical Index Error - Pentax W-1502N Series Instruction Manual

4. The software will calculate the new collimation error and vertical index
error automatically.
5. Tap "Enter" to save the new values, or tap "Cancel" to use old values.
Note:
The adjustment can be performed by the program when C<30", if C>30",
adjust the reticle.
Reticle Adjusting:
1. Rotate the instrument in face right position, turning horizontal tangent
screw until Hr'=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:
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