8| English
1 609 92A 21C | (22.9.16) Bosch Power Tools
Deactivating the Automatic Shut-off
The measuring tool automatically switches itself off if no but-
ton is pressed for 30 minutes. To deactivate the automatic
shut-off, hold down the horizontal mode button 5for 3 s when
switching on the measuring tool. The laser lines will flash brief-
ly after 3 seconds if the automatic shut-off is deactivated.
Do not leave the switched-on measuring tool unattend-
ed 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 on again (without holding down a button).
Operation Modes (see figures A – E)
The horizontal and vertical modes can be switched on and off
independently of each other. All operation modes can be used
both with and without automatic levelling.
Horizontal operation
The measuring tool has multiple horizontal operation modes:
– horizontal laser line forwards
– horizontal laser line forwards and to the left-hand side
– horizontal laser lines to all four sides
After it has been switched on, the measuring tool is in horizon-
tal mode and emits a horizontal laser line forwards.
To switch the horizontal mode on/off or to change the hori-
zontal operation mode, press the horizontal mode button 5
repeatedly until the required operation mode is reached.
Vertical mode and plumb point
The measuring tool has multiple vertical operation modes:
– vertical laser line forwards
– vertical laser line forwards and to the left-hand side
– vertical laser line forwards and backwards
– vertical laser lines to all four sides
A plumb point is additionally projected downwards in all ver-
tical operation modes.
To switch the vertical mode on/off or to change the vertical
operation mode, press the vertical mode 2button repeatedly
until the required operation mode is reached.
You can use the fine adjustment knob 9of the rotating plat-
form to align the vertical laser lines precisely with reference
points.
Pulse Function
When working with the laser receiver 25, 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 25.
To switch on the pulse function, press button 4. When the
pulse function is switched on, the pulse-function indicator 19
lights up red.
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 4again when working with-
out laser receiver. When the pulse function is switched off,
the pulse-function indicator 19 is deactivated.
Automatic Levelling
Working with Automatic Levelling
Position the measuring tool on a level and firm support or
mount it to the tripod 23.
The measuring tool automatically works in the automatic lev-
elling default setting. To work with automatic levelling, the au-
tomatic levelling indicator 21 must not light up continuously.
If necessary, switch automatic levelling on again by pressing
button 1so that indicator 21 flashes (the measuring tool be-
gins to level in).
The automatic levelling function automatically compensates
irregularities within the self-levelling range of ± 3°. The auto-
matic levelling indicator 21 flashes during levelling. As soon
as the indicator extinguishes, the measuring tool is levelled in.
If automatic levelling is not possible, e.g. because the surface
on which the measuring tool stands deviates by more than 3°
from the horizontal plane, the automatic levelling indicator 21
flashes continuously.
Set up the measuring tool in a level position and wait for the
self-levelling to take place. The automatic levelling indicator
21 will extinguish as soon as levelling is completed.
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 laser lines with regard to
the reference points to avoid errors.
Working without Automatic Levelling
To work without automatic levelling, press button 1. The auto-
matic levelling indicator 21 lights up continuously.
When automatic levelling is switched off, you can hold the
measuring tool freely in your hand or place it on an inclined
surface. The laser lines no longer necessarily run perpendicu-
lar 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.
As thermal fluctuation is largest close to the ground, the
measuring tool, if possible, should be mounted on the tripod
23 and placed in the centre of the working area.
In addition to external influences, device-specific influences
(e.g. falls or heavy impacts) can also lead to deviations. For this
reason, check the calibration each time before beginning work.
First check the height accuracy and levelling accuracy of the
horizontal laser lines, then the levelling accuracy of the verti-
cal laser lines.
Should the measuring tool exceed the maximum deviation
during one of the tests, please have it repaired by a Bosch af-
ter-sales service.
Checking the Height Accuracy of the Horizontal Lines
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 close to wall A on a tripod, or
place it on a firm, flat surface. Switch on the measuring
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