Bosch GLL 5-50 X Professional Original Instructions Manual page 9

OBJ_BUCH-2753-001.book Page 9 Wednesday, November 4, 2015 4:09 PM
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 close to wall A on the rotating
platform or a tripod, or place it on a firm, flat surface.
Switch on the measuring tool in the mode with automatic
levelling. Switch on horizontal mode and any vertical oper-
ation mode.
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.
Bosch Power Tools
A
d
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
follows:
d = double the distance between the walls x 0.2 mm/m
max
Example: If the distance between the walls is 5 m, the maxi-
mum deviation is
d = 2 x 5 m x 0.2 mm/m = 2 mm. The marks must there-
max
B
fore be maximum 2 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.
– Mount the measuring tool in the middle between walls A
and B on the rotating platform or a tripod, or place it on a
firm, flat surface. Switch on the measuring tool in the mode
with automatic levelling. Switch on horizontal mode and al-
low 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.
English | 9
B
180°
can be calculated as
max
B
1 609 92A 1SA | (4.11.15)