Bosch GLL 100 G Consignes D'utilisation page 21

Automatic Leveling
Working with Automatic Leveling (see figures B1–E1)
– Position the measuring tool on a level, firm support or attach it to the
rotating mount 19 and 20.
– For work with automatic leveling, slide the On/Off switch 2 to posi-
tion " ".
After switching on, the leveling function automatically compensates
irregularities within the self-leveling range of ±4°. The measuring tool
is levelled in as soon as the laser lines no longer flash.
The laser beam will flash if the automatic leveling is not possible. This
can be caused by placing the measuring tool on a surface that devi-
ates by more than 4° from the horizontal plane. In this case, bring the
measuring tool to the level position and wait for the self-leveling to
take place.
In case of ground vibrations or position changes during operation, 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-leveling.
Working without Automatic Leveling (see figure F1)
– For work without automatic leveling, slide the On/Off switch 2 to po-
sition " ". When automatic leveling is switched off, the laser lines
will flash continuously.
When automatic leveling 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 perpendicular to each other.
Leveling Accuracy
Influences on Accuracy
The ambient temperature has the greatest influence. Temperature dif-
ferences occurring from the ground upward can divert the laser beam.
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