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26.4 The Optical Sight
Ⅰ. Check
1. Mount the instrument on a tripod and fix it.
2. Set a cross mark target which apart from the
instrument about 50m.
3. Take the telescope sight the cross mark.
4. Observe the optical sight collimator whether
collimating the cross mark, if collimate the mark,
adjustment is not necessary; if not, adjust it.
Ⅱ. Adjustment
1. Mount the instrument at the tripod and fix it.
2. Set a cross mark target which apart from the
instrument about 50m.
3. Take the telescope sight the cross mark.
4. Loosen two fixing screws, adjust the collimator, then fix the two screws again.
26.5 Optical Plummet (optional)
Ⅰ. Check
1. Mount the instrument at the tripod and fix it.
2. Set a cross mark under the instrument
3. Coincide the center mark of the optical plummet with the cross mark by adjusting three
leveling foot screws.
4. Turn the instrument 180°/200gon, check the center mark and cross mark, if they are
coincide, no adjustment is necessary, if not, adjust it.
Ⅱ. Adjustment
1. Set the instrument on stable device and fix it.
2. Set a cross mark under the instrument.
3. Use the three leveling screws and coincide the center mark of plummet and cross mark
on the ground.
4. Rotate the instrument 180°/200gon around and take off the cover of the optical
plummet eyepiece, adjust the four adjusting screws with the adjusting pin to shift the
center mark to the cross mark, correct only one-half of the displacement in this manner.
(5) Repeat the operation in (3) and (4) until coincide the center mark of the plummet and
cross mark on the ground.
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