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14 | English
1 609 92A 0KH | (28.4.14) Bosch Power Tools
Direct the laser against the close wall A and allow the meas-
uring tool to level in. Mark the centre of the point where the
laser lines cross each other on the wall (point I).
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).
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 such a manner that the cross
point of the laser lines is projected against the previously
marked point II on the wall B.
Without changing the height, turn around the 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
indicates the actual height deviation of the measuring tool.
The maximum permitted deviation d
max
is calculated as
follows:
d
max
= double distance of the walls x 0.3 mm/m
Example: With a 5 metre distance between the walls, the max-
imum deviation must not exceed
d
max
= 2 x 5 m x 0.3 mm/m = 3 mm. Thus, the marks must not
be more than 3 mm apart.
Checking the Levelling Accuracy of the Horizontal Line
For the check, a free surface of approx. 5 x 5 metres is
required.
Mount the measuring tool between both walls A and B onto
the holder or a tripod, or place it on a firm and level
surface. Allow the measuring tool to level in.
At a distance of 2.5 metres from the measuring tool, mark
the centre of the laser line (point I on wall A and point II on
wall B) on both walls.
Set up the measuring tool 5 metres away turned by 180°
and allow it to level in.
Align the height of the measuring tool (using a tripod or by
underlaying, if required) in such a manner that the centre
of the laser line is projected exactly against the previously
marked point II on wall B.
A
B
5 m
A
B
180°
A
B
d
180°
A
B
2,5 m
5,0 m
A
B
2,5 m
d
5,0 m
2,5 m
2,5 m
5,0 m
0m
A
B
OBJ_BUCH-2049-002.book Page 14 Monday, April 28, 2014 4:59 PM
14


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