SHANGHAI ESURVEY GNSS CO., LTD.
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8.3 Check and Adjust the Vertical Line of the Reticle
If the vertical line of the telescope reticle is not perpendicular to the horizontal axis of the telescope,
adjustment is required (because one point on the vertical line may be used to collimate the target
for horizontal angle measurement or for vertical staking).
To check and adjust the vertical line of the reticle, do the following:
1. Set the instrument on a tripod and precisely level it.
2. Set a point A at 50 m away from the instrument.
3. Collimate the telescope of the instrument to point A, turn the vertical tangent screw, and
observe if point A moves along the vertical line of the reticle:
o If it does, no adjustment is required.
o If not, proceed to step 4 - 8.
4. Turn the eyepiece cover of the reticle counterclockwise, and remove the cover to expose
the four screws fixing the eyepiece:
5. Use a cross screwdriver to slightly loosen the four screws fixing the eyepiece.
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