2-10
2 PREPARATION FOR MEASUREMENT
2.5.2 L
evelling
PROCEDURE
1) Perform the centering procedure.
See Section 2.5.1 “Centering”.
2) Roughly center the bubble in the circular level by either
shortening the tripod leg closest to the offcenter
direction of the bubble or by lengthening the tripod leg
farthest from the offcenter direction of the bubble. Adjust
one more tripod leg to center the bubble.
3) Power ON the instrument.
See Section 2.1 “Power Switch Key ON”.
The electric circular level is displayed on the <Tilt>.
“
” indicates the bubble in circular level. The range of
the inside circle is ±4' and the range of the outside circle
is ±6'.
Tilt angle values X and Y are also displayed on the
screen.
•
“
” is not displayed when the tilt of the instrument
exceeds the detection range of the tilt sensor. Level the
instrument while checking the air bubbles in the circular
level until “
” is displayed on the screen.
•
When executing the measurement program, if
measurement starts with the instrument tilted, the
circular level is displayed on the screen.
4) Using levelling foot screws, center “
” in the circular
level.
First, turn the instrument until the telescope is parallel to
a line between levelling foot screws A and B. Next, set
the tilt angle to 0° using foot screws A and B for the X
direction and levelling screw C for the Y direction.
•
When the bubble is in the center, proceed to step 5.
5) Loosen the centering screw slightly.
Looking through the optical plummet eyepiece, slide the
instrument over the tripod head until the survey point is
exactly centered in the reticle.
Retighten the centering screw securely.
If the instrument is levelled using laser plummet, emit
the laser plummet beam and check it again.
See “PROCEDURE: Centering with the laser
Tripod legs
adjustment
Tilt
X -3'20"
Y 3'40"
X
Y
OK L-ON
Tilt
X ****
Y ****
X
Y
OK L-ON
Slide the instrument
over the tripod head
Centering screw
