Bosch GPL100-30G Consignes D'utilisation/De Sécurité page 18

cally compensates irregularities within the self-levelling range of
±4°. The levelling is finished as soon as the laser points light up
continuously (i.e. no longer flashing) and do not move any more.
If automatic levelling is not possible, e.g. because the surface on
which the measuring tool stands deviates by more than 4° from
the horizontal plane, the laser points will flash continuously and
quickly.
If this is the case, set up the measuring tool in a level position
and wait for the self-levelling to take place. As soon as the mea-
suring tool is within the self-levelling range of ±4°, the laser
points will light up continuously.
In case of ground vibrations or position changes during opera-
tion, the measuring tool is automatically levelled again. After
each levelling process, check the position of the horizontal
and/or vertical laser points in relation to the reference points
to avoid errors arising from a change in the measuring tool's
position.
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 tripod for
measuring distances of 65 ft (20 m) or more. In addition, posi-
tion the measuring tool in the centre of the work surface, wher-
ever this is possible.
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GPL100-30G 50G 11-20.indd 18 4/23/21 5:27 PM