Bosch GLL 3-80 P Professional Notice Originale page 20

OBJ_BUCH-1046-001.book Page 20 Tuesday, September 22, 2009 6:20 PM
20 | English
Checking the Horizontal Levelling Accuracy of
the Lateral Axis
For this check, a free measuring distance of
5 metres on a firm surface between two walls A
and B is required.
– Mount the measuring tool onto a tripod, or
place it on a firm and level surface close to
wall A. Switch on the measuring tool to oper-
ation with automatic levelling. Select the
operating mode in which a horizontal laser
plane as well as a vertical laser plane in front
of the measuring tool are generated.
5 m
– Direct the laser against the close wall A and
allow the measuring tool to level in. Mark the
centre of the point where the laser lines
cross each other at wall A (point I).
180˚
– Turn the measuring tool by 180°, allow it to
level in and mark the cross point of the laser
lines on the opposite wall B (point II).
1 609 929 S05 | (22.9.09)
– 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
a tripod or by underlaying, if required) in
B
such a manner that the cross point of the la-
ser lines is projected against the previously
marked point II on the wall B.
d d
– Without changing the height, turn around the
B
measuring tool by 180°. Direct it against the
wall A in such a manner that the vertical laser
line runs through the already marked point I.
Allow the measuring tool to level in and mark
the cross point of the laser lines on the wall A
(point III).
– 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
lateral axis.
On the measuring distance of 2 x 5 m = 10 m,
the maximum allowable deviation is:
10 m x ±0.2 mm/m = ±2 mm.
Thus, the difference d between points I and III
must not exceed 2 mm (max.).
B
B
180˚
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