Centering - Prexiso T.O.2 Manual De Usuario

3.4 Centering

Centering with
plumb bob
Centering with
Optical plummet
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".
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).
1 2
a
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 not to turn the

To ensure maximum meas-
uring precision, we recommend
the performance of the steps
described in "5 Inspection and
Adjustment" before using this
instrument.
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