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Bosch GLL 2-80 P Manual

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14 | English
1 609 92A 0KK | (7.5.14) Bosch Power Tools
After switching on, the measuring tool is in horizontal opera-
tion. Press the operating mode button 5 to change the operat-
ing mode.
All three operating modes can be selected either with or with-
out automatic levelling.
Pulse Function
When working with the laser receiver 17, the pulse function
must be activated – independent of the selected operating
mode.
In pulse function, the laser lines flash at very high frequency
and thus become detectable by the laser receiver 17.
To switch on the pulse function, press button 3. When the
pulse function is switched on, the pulse-function indicator 4
lights up green.
When the pulse function is switched on, the visibility of the la-
ser lines is reduced for the human eye. Therefore, shut off the
pulse function by pushing button 3 again when working with-
out laser receiver. When the pulse function is switched off,
the pulse-function indicator 4 is deactivated.
Automatic Levelling
Working with Automatic Levelling
Position the measuring tool on a level and firm support, attach
it to the holder 19 or to the tripod 22.
When working with automatic levelling, push the On/Off
switch 7 to the “ on” position.
After switching on, the levelling function automatically com-
pensates irregularities within the self-levelling range of ±4°.
The levelling is finished as soon as the laser beams 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 lines begin to flash rapid-
ly. When the audio signal is activated, a fast-beat signal
sounds for 30 s (maximum). This alarm is deactivated within
10 s after switching on, in order to allow adjustment of the
measuring tool.
Set up the measuring tool in level position and wait for the
self-levelling to take place. As soon as the measuring tool is
within the self-levelling range of ±4°, all laser beams light up
continuously and the audio signal is switched off.
In case of ground vibrations or position changes during oper-
ation, the measuring tool is automatically levelled in again. To
avoid errors, check the position of the horizontal and vertical
laser line with regard to the reference points upon re-level-
ling.
Working without Automatic Levelling
For working without automatic levelling, slide the On/Off
switch 7 to the “ on” position. When automatic levelling is
switched off, indicator 6 lights up red and for the first 30 s la-
ser beams flash slowly.
When the automatic levelling is switched off, the measuring
tool can be held by hand or placed on an inclined surface. In
cross-line operation, the two laser lines do not necessarily run
at a right angle 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.
Because the largest difference in temperature layers is close
to the ground, the measuring tool should always be mounted
on a tripod when measuring distances exceeding 20 m. If pos-
sible, also set up the measuring tool in the centre of the work
area.
Apart from exterior influences, device-specific influences
(such as heavy impact or falling down) can lead to deviations.
Therefore, check the accuracy of the measuring tool each
time before starting your work.
Firstly, check the levelling accuracy of the horizontal laser line
and then the levelling accuracy of the vertical laser line.
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 Lateral
Axis
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.
– 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).
– 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).
– Without turning the measuring tool, position it close to wall
B. Switch the measuring tool on and allow it to level in.
A
B
180°
OBJ_BUCH-907-003.book Page 14 Wednesday, May 7, 2014 1:39 PM
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