Bosch GLL 30 G Original Instructions Manual page 10

10 | English
Switching On/Off
To switch on the measuring tool, slide the on/off switch (2) to the "On" position. Imme-
diately after switching on, the measuring tool sends laser lines out of the outlet aperture
(1).
Do not direct the laser beam at persons or animals and do not stare into the laser
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beam yourself (even from a distance).
To switch off the measuring tool, slide the on/off switch (2) to the "Off" position. The
pendulum unit is locked when the tool is switched off.
Never leave the measuring tool unattended when switched on, and ensure the
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measuring tool is switched off after use. Others may be blinded by the laser beam.
Automatic Levelling
Position the measuring tool on a level, firm surface or attach it to the holder (11) or the
tripod (12).
After switching on, the automatic levelling function automatically compensates irregular-
ities within the self-levelling range of ±4°. The levelling is finished as soon as the laser
lines are permanently lit (i.e. no longer flashing) and do not move anymore.
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 lines will flash at
regular intervals (in a blinking sequence of 1 s off, 3 s on).
If this is the case, set up the measuring tool in a level position and wait for the self-level-
ling to take place. As soon as the measuring tool is within the self-levelling range of ±4°,
the laser lines will light up continuously.
In case of ground vibrations or position changes during operation, the measuring tool is
automatically levelled again. Upon re-levelling, check the position of the horizontal or
vertical laser line with regard to the reference points to avoid errors by moving the meas-
uring tool.
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 mount the
measuring tool on a tripod and position it in the centre of the work surface, wherever this
is possible.
1 609 92A 4F1 | (28.06.2018) Bosch Power Tools