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Otherwise, the following adjustment is required.
Adjust
1. Take off the protective cover between the optical plummet eyepiece and focusing knob.
2. Fix the paper. Rotate the instrument and mark the point of the center of optical plummet which falls on
the paper at every 90. As illustrated: Point A, B, C, and D.
3. Draw lines that attach AC and BD and mark the intersection point of the two lines as O.
4. Adjust the four adjusting screws of the optical plummet with an adjusting pin until the center mark
coincides with Point O.
5. Repeat the inspection and adjusting steps to make the instrument meets the requirements.
6. Replace the protective cover.
12.8 INSTRUMENT CONSTANT (K)
Instrument constant has been checked up and adjusted in the factory, K=0. It seldom changes and it is
suggested to check one or two times every year. The inspection should be made on the base line, also
can be made according to the following method.
Check
1. Mount and level the instrument on Point A at a plain field. Use the vertical hair to mark Point B and
Point C with the distance of 50m on the same line, and set the reflector accurately.
2. After setting temperature and air pressure, measure the horizontal distance of AB and AC accurately.
3. Set the instrument on Point B and center it accurately, measure the Horizontal Distance of BC
accurately.
4. Then the Instrument Constant can be obtained:
K＝AC－(AB＋BC)
K should be near to 0, If ｜K｜＞5mm, the instrument should be strictly inspected in the standard
baseline site, and adjusted according to the inspection value.
Adjust
If a strict inspection proves that the Instrument Constant K has changed and is not close to 0. If the
operator wants to adjust, should set Stadia Constant according to the Constant K
●Set the orientation via the Vertical Hair to maintain Point A, B, C on the same line precisely. There
must be a fixed and clear centering mark on the ground of Point B
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