9 CHECK AND ADJUSTMENT
9-8
Note:
1 First, loosen the capstan adjustment screw on the side to which the vertical cross-hair line must
be moved. Then tighten the adjustment screw on the opposite side by an equal amount which
will leave the tension of the adjustment screws unchanged. Revolve in the counterclockwise
direction to loosen and in the clockwise direction to tighten, but revolve as little as possible.
2 Perform following adjustment after complete above adjustment. Section 9.4 “Adjustment of
Compensation Systematic Error of Instrument” , Section 9.2 “Checking the Optical Axis” and
Section 9.8 “Inspection and Adjustment of Optic Axis for Auto -Tracking (GPT-8000A Series)”.
9.3.5 Checking / Adjusting the Optical Plummet Telescope
Adjustment is required to make the line of sight of the optical plummet telescope coincide with the
vertical axis (otherwise the vertical axis will not be in the true vertical above the reference point when
the instrument is optically plumbed).
• Check
1) Coincide the center mark and the point. (See Chapter 2 “PREPARATION FOR
MEASUREMENT”.)
2) Rotate the instrument 180° or 200g around the vertical axis and check the center mark.
If the point is properly centered in the center mark, adjustment is not required. Otherwise,
adjust in the following manner.
• Adjustment
1) Take off the adjustment section cover of the optical plummet telescope eyepiece. This will
expose four capstan adjustment screws which should be adjusted with the accessory adjusting
pin to shift the center mark to the point. However, correct only one-half of the displacement in
this manner.
2) Use the leveling screws and coincide the point and center mark.
3) Rotate the instrument 180° or 200g around the vertical axis once more and check the center
mark. If it is coincided to the point, then further adjustment is not required. Otherwise, repeat
the adjustment.
Note:
First, loosen the capstan adjustment screw on the side to which the center mark must be moved.
Then tighten the adjustment screw on the opposite side by an equal amount which will leave the
tension of the adjustment screws unchanged. Revolve in the counterclockwise direction to loosen
and in the clockwise direction to tighten, but revolve as little as possible.
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