Automatic Levelling - Bosch GCL 2-15 Professional Manual Original

OBJ_BUCH-2637-003.book Page 20 Friday, July 1, 2016 9:19 AM
20 | English

Automatic Levelling

Working with Automatic Levelling (see figures B1–E1)
– Position the measuring tool on a level, firm support or at-
tach it to the rotating mount 13.
– For work with automatic levelling, slide the On/Off switch
2 to position " ".
After switching on, the levelling function automatically com-
pensates irregularities within the self-levelling range of ±4° .
The measuring tool is levelled in as soon as the laser lines no
longer flash.
If the automatic levelling function is not possible, e.g. be-
cause the surface on which the measuring tool stands devi-
ates by more than 4° from the horizontal plane, the laser
beams flash. In this case, bring the measuring tool to the level
position and wait for the self-levelling to take place.
In case of ground vibrations or position changes during oper-
ation, the measuring tool is automatically levelled in again. To
avoid errors by moving the measuring tool, check the position
of the laser beams with regard to the reference points upon
re-levelling.
Working without Automatic Levelling (see figure F1)
– For work without automatic levelling, slide the On/Off
switch 2 to position " ". When automatic levelling is
switched off, the laser lines flash continuously.
When automatic levelling is switched off, you can hold the
measuring tool freely in your hand or place it on an inclined
surface. The laser beams no longer necessarily run vertical to
each other.
Levelling Accuracy
Influences on Accuracy
The ambient temperature has the greatest influence. Espe-
cially temperature differences occurring from the ground up-
ward can divert the laser beam.
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 be-
ginning work.
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 af-
ter-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 a tripod or place it on a firm
and level surface close to wall A. Switch on the measuring
tool. Select cross-line operation with automatic levelling.
1 609 92A 32T | (1.7.16)
– 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
B
5 m
– 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).
A B
180°
– W ithout 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.
A B
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