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10.7 Optical Plummet
Checks
①Set the instrument on the tripod, and place a piece of white paper with a cross drawn on it
right under the instrument.
②Look through the optical plummet, and move the paper so that the intersecting point of the
cross comes to the center of the field of view.
③Adjust the leveling screws so that the center mark of the optical plummet coincides with
the intersecting point of the cross.
④Rotate the instrument around the vertical axis. Look through the optical plummet each 90°
of rotation, and observe the center mark position against the intersecting point of the cross.
⑤If the center mark always coincides with the intersecting point, no adjustment is necessary.
Adjustments
①If the center mark does not coincide with the intersecting point,
rotate the optical plummet focusing knob cover and remove it.
②Mark the point set on the line of sight at each step of 90° on the
white paper and call them A, B, C and D.
③Join the opposed points (A,C and B,D) with a straight line, and
set the intersecting point 0.
④Turn the four optical plummet adjusting screws with a
adjusting pin so that the center mark coincides with the
intersecting point 0.
⑤Repeat from ④ and check that adjustment is correct.
10.8 Offset Constant
The offset constant rarely changes. It is recommended, however, that check be done once or
twice a year.
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