Automatic Levelling; Accuracy Check Of The Measuring Tool - Bosch GLL 3-80 G Professional Notice Originale

To switch on receiver mode, press the receiver mode button
(4). The receiver mode indicator (5) will light up green.
When receiver mode is switched on, the laser lines are less
visible to the human eye. Therefore, switch receiver mode
off by pressing the receiver mode button (4) again to work
without a laser receiver. The receiver mode indicator (5) will
go out.

Automatic Levelling

Working with Automatic Levelling
Position the measuring tool on a level, firm surface or attach
it to the universal holder (16) or the tripod (21).
For work with automatic levelling, slide the on/off switch (7)
to the " On" position.
The automatic levelling function automatically compensates
irregularities within the self-levelling range of ±4°. The level-
ling is finished as soon as the laser lines stop moving.
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 begin to
flash quickly. If the signal tone function is activated, rapid
signal tones will sound.
Set up the measuring tool in a horizontal position and wait
for the self-levelling to take place. As soon as the measuring
tool is within the self-levelling range of ±4°, the laser lines
will light up continuously and the signal tones will cease.
In case of ground vibrations or position changes during oper-
ation, the measuring tool is automatically levelled again.
Upon re-levelling, check the position of the horizontal or ver-
tical laser line with regard to the reference points to avoid er-
rors by moving the measuring tool.
Working with the Pendulum Lock
For work with the pendulum lock, slide the on/off switch (7)
to the " On" position. The pendulum lock indicator (3)
lights up red and the laser lines continuously flash slowly.
For work with the pendulum lock, the automatic levelling is
switched off. You can hold the measuring tool freely in your
hand or place it on a sloping surface. This means that 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.
Bosch Power Tools
First check the levelling accuracy of the horizontal laser line,
then the levelling accuracy of the vertical laser lines.
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 Horizontal Levelling Accuracy of the
Transverse Axis
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, flat surface. Switch on the measuring
tool in the mode with automatic levelling. Select the oper-
ating mode for generating a horizontal laser plane and a
vertical laser plane directly in front of the measuring tool.
A
5 m
– 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).
A
180°
– 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 Ⅱ).
– Position the measuring tool – without rotating it – close to
wall B, switch it on and allow it to level in.
A
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B
B
B
1 609 92A 7S6 | (03.05.2022)