18-5
18 CHECKS AND ADJUSTMENTS
18.4 Reticle
Check 1: Perpendicularity of the reticle to the horizontal axis
1) Carefully level the instrument.
2) Align a clearly visible target (the edge of a roof for example)
on point A of the reticle line.
3) Use the telescope fine motion screw to align the target to
point B on a vertical line.
If the target moves parallel to the vertical line, adjustment is
unnecessary. If its movement deviates from the vertical line,
have our service representative adjust it.
Check 2: Vertical and horizontal reticle line positions
•
Perform check in weak sunlight and no scintillation.
•
"Tilt crn" should be se to "Yes (H,V)" and "coll.crn" to "Yes" in <Obs. condition> while performing
checks.
1) Carefully level the instrument.
2) Install a target at a point about 100m in the horizontal
direction from the instrument.
3) While the observation screen is displayed and the
telescope is in Face 1, sight the center of the target
correctly and read out the horizontal angle A1 and the
vertical angle B1.
Example:
Horizontal angle A1 =18° 34' 00"
Vertical angle B1
=90° 30' 20"
4) While the telescope is in Face 2, sight the center of the
target correctly and read out the horizontal angle A2 and
the vertical angle B2.
Example:
Horizontal angle A2 =198° 34' 20"
Vertical angle B2
=269° 30' 00"
