9 CHECK AND ADJUSTMENT

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.

2Perform 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 9.9 “Inspection and Adjustment of Optic Axis for Auto -Tracking” .

9.3.5Checking / 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).

lCheck

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.

lAdjustment

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.

Capstan adjustment screws

1/2 of displacement

Capstan

adjustmentEyepiece screws

Plummet telescope

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.

9-8

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Topcon GTS-821A, GTS-822A, GTS-823A, GTS-825A instruction manual Checking / Adjusting the Optical Plummet Telescope
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GTS-822A, GTS-825A, GTS-821A, GTS-822A, GTS-823A, GTS-825A, GTS-823A specifications

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