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Adjustment
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 fall of the center of optical plummet on the
paper at every 90°. As illustrated: Point A, B, C, 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 be sure the adjustment is correct.
6. Replace the protective cover.
22.9 Instrument Constant（K）
Instrument constant has been checked and adjusted in the factor, 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.
Inspection
1. Mount and level the instrument on Point A in a plain place. Use the vertical hair to mark Point B and
Point C on the same line with the distance of 50m on the same line, and set the reflector accurately.
2. After setting temperature and air pressure in the instrument, 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 you can get the Instrument Constant：
K＝ＡＣ－(ＡＢ＋ＢＣ)
K should be closed to ０，If ｜K｜＞５ｍｍ, the instrument should be strictly inspected in the
standard baseline site, and adjusted according the inspection value.
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