Preparation before Measurement
T.O.2
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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 perpen-
dicular 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 ensure maximum measuring
precision, we recommend the
performance of the steps
described in "5 Inspection and
Adjustment" before using this
instrument.
a
1
2
