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Bosch Power Tools 1 609 929 S04 | (30.6.09)
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 tri-
pod 21.
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 levelling is fin-
ished as soon as the laser beams do not move
any more.
If automatic levelling is not possible, e.g. be-
cause the surface on which the measuring tool
stands deviates by more than 4° from the hori-
zontal 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 or-
der 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 continu-
ously and the audio signal is switched off.
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.
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, indica-
tor 6 lights up red and for the first 30 s laser
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 influ-
ence. Especially temperature differences occur-
ring from the ground upward 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 possi-
ble, 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 be-
fore starting your work.
Firstly, check the levelling accuracy of the hori-
zontal 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.
OBJ_BUCH-907-001.book Page 19 Tuesday, June 30, 2009 2:32 PM
(7 pages)
(36 pages)
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