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Bosch GCL 2-50 G Manual

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18 | English
The automatic levelling function automatically compensates
irregularities within the self-levelling range of ±4°. Once the
laser beam is permanently lit, the measuring tool has levelled
in.
If automatic levelling is not possible, e.g. because the sur-
face on which the measuring tool stands deviates by more
than 4° from the horizontal plane, the laser lines will initially
flash quickly for 2seconds, then quickly flash every
5seconds several times. The measuring tool is in the incline
function.
For additional work with automatic levelling, set up the
measuring tool so that it is horizontal and wait for the self-
levelling procedure to complete. As soon as the measuring
tool is within the self-levelling range of ±4°, the laser beams
will light up continuously.
In case of ground vibrations or position changes during oper-
ation, the measuring tool is automatically levelled again.
Upon levelling, check the position of the laser beams with re-
gard to the reference points to avoid errors arising from a
change in the measuring tool's position.
Working with the Incline Function (seefigureE)
Place the measuring tool on an inclined surface. When work-
ing with the incline function, the laser lines will initially flash
quickly for 2seconds, then quickly flash every 5seconds
several times.
In the incline function, the laser lines are no longer levelled
and no longer necessarily run perpendicular to one another.
Accuracy Check of the Measuring Tool
Influences on Accuracy
The largest influence is exerted by the ambient temperature.
In particular, temperature differences that occur from the
ground upwards can refract the laser beam.
Since the temperature stratification is greatest at ground
level, you should always mount the measuring tool on a tri-
pod for measuring distances of 20m or more. In addition,
position the measuring tool in the centre of the work surface,
wherever this is possible.
In addition to external influences, device-specific influences
(e.g. falls or heavy impacts) can also lead to deviations. For
this reason, check the levelling accuracy each time before
beginning work.
First check the height accuracy and 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, you will need a free measuring distance of
5m on firm ground between two walls (designated A andB).
– Mount the measuring tool close to wallA on a tripod, or
place it on a firm, level surface. Switch on the measuring
tool and select cross-line operation.
5 m
AB
– Aim the laser at the closer wall A and allow the measuring
tool to level in. Mark the middle of the point at which the
laser lines cross on the wall (pointI).
180°
AB
– Turn the measuring tool 180°, allow it to level in and mark
the point where the laser lines cross on the opposite wall
B (point).
– Position the measuring tool –without rotating it– close to
wallB, switch it on and allow it to level in.
AB
– Align the height of the measuring tool (using the tripod or
by placing objects underneath as required) so that the
point where the laser lines cross exactly hits the previ-
ously marked point on wallB.
d
180°
AB
1 609 92A 7LT | (28.04.2022) Bosch Power Tools
… 18 …


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