20
| English
1 609 929 S04 | (30.6.09)
Bosch Power Tools
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 survace close to
wall A. Switch on the measuring tool. Select
cross-line operation with automatic levelling.
– 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 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 results in the actual height devi-
ation of the measuring tool alongside the lat-
eral 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
5 m
B
180˚
B
B
d
d
180˚
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