Bosch Professional GRL 150 HV Manual Original página 34

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34 | English
measurement is to be carried out across both
axes X and Y (both positive and negative) (alto-
gether 4 complete measurements).
– Mount the measuring tool in the horizontal po-
sition onto a tripod 48 (accessory) or place it
on a firm and level surface near wall A. Switch
the measuring tool on.
A
20 m
– After levelling, direct the laser beam in point
operation onto the close wall A. Mark the
centre point of the laser beam on the wall
(point I).
A
180˚
– 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.
A
1 609 929 R48 | (10.12.08)
– 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.
A
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 amounts to the actual deviation
of the measuring tool for the measured axis.
B
Repeat the measuring procedure for the other
three axes. For this, turn the measuring tool
prior to each measuring procedure by 90°.
On the measuring section of 2 x 20 m = 40 m,
the maximum allowable deviation is:
40 m x ±0.1 mm/m = ±4 mm.
Consequently, the difference d between points
I and III for each of the four individual measure-
ments may not exceed 4 mm max.
If the measuring tool should exceed the maxi-
mum deviation in anyone of the four measuring
procedures, have it checked at a Bosch after-
sales service agent.
Working Instructions for the Rotational
Laser Level
B
Always use the centre of the laser point for
marking. The size of the laser point changes
with the distance.
Laser Viewing Glasses (Accessory)
The laser viewing glasses filter out the ambient
light. This makes the red light of the laser ap-
pear brighter for the eyes.
B
180˚
Bosch Power Tools