Bosch GLL 2-50 Professional - Manual (Page 19)

English | 19
Bosch Power Tools 1 609 929 S02 | (19.3.09)
Switching On and Off
To switch on the measuring tool, push the
On/Off switch 7 to the “ on” position (when
working without automatic levelling) or to the
“
on” position (when working with automatic
levelling). Immediately after switching on, the
measuring tool sends laser beams out of the exit
openings 1.
f
Do not point the laser beam at persons or
animals and do not look into the laser beam
yourself, not even from a large distance.
To switch off the measuring tool, slide the
On/Off switch 7 to the “off” position. When
switching off, the levelling unit is locked.
Deactivating the Automatic Shut-off
The measuring tool switches off automatically
after an operating duration of 30 minutes. To
deactivate the automatic switch-off, keep the
operating mode button 4 pressed for 3 s while
switching on the measuring tool. When the auto-
matic switch-off is deactivated, the laser lines
briefly flash after 3 s.
f
Do not leave the switched on measuring
tool unattended and switch the measuring
tool off after use. Other persons could be
blinded by the laser beam.
To activate the automatic shut-off, switch the
measuring tool off and then on again (without
the operating mode button 4 pushed).
Operating Modes (see figures A–D)
The measuring tool has three operating modes
between which you can switch at any time:
– Horizontal operation “–”: Produces a hori-
zontal laser line,
– Vertical operation “l”: Produces a vertical
laser line,
– Cross-line operation “+”: Produces a hori-
zontal and vertical laser line.
After switching on, the measuring tool is in
cross-line operating mode. To change the oper-
ating mode, press the operating mode button 4.
All three operating modes can be selected either
with or without automatic levelling.
Pulse Function
When working with the laser receiver 21, 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 for
the laser receiver 21.
To switch on the pulse function, press button 3.
When the pulse function is switched on, the
pulse-function indicator 2 lights up green.
When the pulse function is switched on, the
visibility of the laser lines is reduced for the
human eye. Therefore, shut off the pulse func-
tion by pushing button 3 again when working
without laser receiver. When the pulse function
is switched off, the pulse-function indicator 2
is deactivated.
Automatic Levelling
Working with Automatic Levelling
(see figure C)
Position the measuring tool on a level and firm
support or attach it to a commercially available
photographic tripod.
When working with automatic levelling, push
the On/Off switch 7 to the “
on” position.
After switching on, the levelling function auto-
matically compensates irregularities within the
self-levelling range of ±4°. The measuring tool is
levelled in as soon as the laser lines no longer
flash.
If the automatic levelling function is not pos-
sible, e.g. because the surface on which the
measuring tool stands deviates by more than 4°
from the horizontal plane, the laser beams flash.
In this case, bring the measuring tool to the level
position and wait for the self-levelling to take
place.
In case of ground vibrations or position changes
during operation, the measuring tool is automat-
ically levelled in again. To avoid errors, check
the position of the horizontal and vertical laser
line with regard to the reference points upon
re-levelling.
OBJ_BUCH-817-004.book Page 19 Thursday, March 19, 2009 12:32 PM