8
| English
1 609 92A 0MG | (19.5.14)
Bosch Power Tools
Horizontal operation
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 laser line off or on, press the horizon-
tal mode
17
button.
Vertical mode and plumb point
The measuring tool has two vertical operation modes:
– vertical laser line forwards
– vertical laser line forwards and to the side
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
16
button repeated-
ly until the required operation mode is reached.
If the measuring tool is mounted on the rotating platform
12
,
you can precisely align the vertical laser lines to reference
points using the fine adjustment knob
11
.
Automatic Levelling
Working with Automatic Levelling
Position the measuring tool on a level, firm support or attach
it to the rotating platform
12
.
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 ±3°.
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 3°
from the horizontal plane, the laser lines will begin to flash
quickly.
Set up the measuring tool in a level position and wait for the
self-levelling to take place. As soon as the measuring tool is
within the self-levelling range of ±3°, the laser lines will light
up continuously.
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
For work without automatic levelling, slide the on/off switch
7
to the
“
On”
position. When automatic levelling is switched
off, the indicator
14
lights up red and the laser lines continu-
ously flash slowly.
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
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and placed in the centre of the working 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.
First check the height accuracy and 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 Height Accuracy of the Horizontal Line
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 the rotating
platform or a tripod, or place it on a firm, flat surface.
Switch on the measuring tool in the mode with automatic
levelling. Switch on horizontal mode and any vertical oper-
ation mode.
– 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
).
A
B
5 m
180°
A
B
OBJ_BUCH-2194-001.book Page 8 Monday, May 19, 2014 12:24 PM
