English |
17
Bosch Power Tools
1 609 929 K01 | (1.10.07)
Levelling accuracy
Influences on Accuracy
The ambient temperature has the greatest influ-
ence. Especially temperature differences occur-
ring from the ground upward can divert the laser
beam.
As thermal fluctuation is largest close to the
ground, the measuring tool, if possible, should
be mounted on a commercially available tripod
and placed in the centre of the working area.
Apart from exterior influences, device-specific
influences (such as heavy impact or falling
down) can lead to deviations. Therefore, check
the accuracy of the measuring tool each time be-
fore starting your work.
First, check both the height as well as the level-
ling accuracy of the horizontal laser line, then
the levelling accuracy of the vertical laser line.
If the measuring tool should exceed the maxi-
mum deviation in anyone of the three measuring
procedures, have it repaired through a Bosch
after-sales service agent.
Checking the Height Accuracy of the
Horizontal Line
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 the cross point of the laser lines on the
wall A (point
III
).
A
B
5 m
A
B
180˚
A
B
d
180˚
A
B
OBJ_BUCH-186-003.book Page 17 Monday, October 1, 2007 12:30 PM
