Bosch GLL 2-15 Professional Manual Original página 13

OBJ_BUCH-2049-003.book Page 14 Wednesday, January 27, 2016 12:50 PM
14 | English
First, check both the height as well as the levelling accuracy of
the horizontal laser line, then the levelling accuracy of the ver-
tical laser line.
Should the measuring tool exceed the maximum deviation
during one of the tests, please have it repaired by a Bosch
after-sales service.
Checking the Height Accuracy of the Horizontal Line
For this check, a free measuring distance of 5 m on a firm sur-
face between two walls A and B is required.
– Mount the measuring tool onto the holder or a tripod, or
place it on a firm and level surface close to wall A. Switch
the measuring tool on.
A
5 m
– 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).
A
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).
– Without turning the measuring tool, position it close to
wall B. Switch the measuring tool on and allow it to level in.
A
– 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.
1 609 92A 25H | (27.1.16)
A
d
– 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
B
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
lows:
d = double distance of the walls x 0.3 mm/m
max
Example: With a 5 metre distance between the walls, the max-
imum deviation must not exceed
d = 2 x 5 m x 0.3 mm/m = 3 mm. Thus, the marks must not
max
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 re-
quired.
B
– Mount the measuring tool between both walls A and B onto
the holder or a tripod, or place it on a firm and level sur-
face. Allow the measuring tool to level in.
A
B
– 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.
B
180°
is calculated as fol-
max
B
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