English | 15
Bosch Power Tools 1 609 929 S07 | (2.10.08)
Checking the Horizontal Levelling Accuracy of
the Longitudinal Axis
A free measuring distance of 20 m on a firm sur-
face between two walls A and B is required for
the check.
– Mount the measuring tool onto the holder or
a tripod, or place it on a firm and level sur-
face close to wall A. Switch the measuring
tool on.
– Direct the horizontal laser beam, which runs
parallel to the longitudinal axis of the meas-
uring tool, at the close wall A. Allow the
measuring tool to level in. Mark the centre of
the laser beam on the wall, (point I).
– Turn the measuring tool around by 180°,
allow it to level in and mark the centre point
of the laser beam on the opposite wall B
(point II).
– Without turning the measuring tool, position
it close to wall B. Switch the measuring tool
on and allow it to level in.
– Align the height of the measuring tool (using
the tripod or by underlaying, if required) in
such a manner that the centre point of the
laser beam is projected exactly against the
previously marked point II on wall B.
– Rotate the measuring tool by 180° without
changing the height. Allow it to level in and
mark the centre point of the laser beam on
wall A (point III). Take care that point III is as
vertical as possible above or below point I.
– The difference d of both marked points I and
III on wall A results in the actual height de-
viation of the measuring tool alongside the
Longitudinal axis.
On the measuring distance of 2 x 20 m = 40 m,
the maximum allowable deviation is:
40 m x ± 0.3 mm/m = ±12 mm.
Thus, the difference d between points I and III
may not exceed 12 mm (max.).
A
B
20 m
A
B
180˚
A
B
d
180˚
A
B
OBJ_BUCH-815-001.book Page 15 Thursday, October 2, 2008 9:04 AM
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