Preparation before Measurement Zipp02 | 17
5. After 2. is finished, turn collimation unit for 180°. If the tubular vial is still
centered, the leveling up of the instrument is finished. If the bubble strays
from the center, perform leveling up with the procedure for adjustment of
tubular vial in "5.1 Tubular Vial".
3.4 Centering
Centering with
plumb bob
1. Tie the plumb bob wire to the hook on the central screw. Adjust the length
of the wire so that the tip of the bob is 2 mm above ground.
2. Loosen the central screw and move the base so that the tip of the plumb
bob is precisely positioned to the ground point (when observed from two
directions perpendicular to each other).
Centering with
Optical plummet
1. Turn the knob of the eyepiece of the optical plummet so that the reticle is
in focus; turn the focusing knob so that the ground point a is in focus.
Then, loosen the central screw to translate the whole instrument (be sure
To ensure maximum meas-
uring precision, we recom-
mend the performance of the
steps described in "5 Inspec-
tion and Adjustment" before
using this instrument.
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