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To deactivate the automatic shut-off, keep
the operating mode button 2 pressed for at
least 3 s (while the measuring tool is switched
on). Deactivation of the automatic shut-off is
confirmed by brief flashing of the laser beams.
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.
Operating Modes
The measuring tool has four operating modes
between which you can switch at any time:
– Cross-line and point operation: The
measuring tool generates a horizontal and a
vertical laser line facing toward the front as well
as a vertical point beam each facing upward
and downward, and a horizontal point beam
each facing toward the front and to both sides.
– 5-point operation: The measuring tool
generates a vertical point beam each facing
upward and downward, as well as a horizontal
point beam each facing toward the front and to
both sides.
– Horizontal line operation: The measuring
tool generates a horizontal laser line facing
frontward.
– Vertical line operation: The measuring tool
generates a vertical laser line facing frontward.
All point beams run at a 90° angle to each
other; the laser lines also cross each other at
a 90° angle. After switching on, the measuring
tool is in cross-line and point-line operation. To
change the operating mode, press the operating
mode button
2.
All operating modes can be selected both with
and without automatic levelling.
Automatic Levelling
Working with Automatic Levelling (see figures
C–E) Position the measuring tool on a level and
firm support, attach it to the holder
15 or to the
tripod
16.
When working with automatic levelling, push the
On/Off switch
4 to the “
on” position.
After switching on, the automatic levelling
function automatically compensates
irregularities within the self-levelling range of
±4°. The levelling is finished as soon as the
laser points or laser lines do not move any
more. If the automatic levelling function 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 beams
flash. 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°, the laser beams light
up continuously. In case of ground vibrations
or position changes during operation, the
measuring tool is automatically levelled in
again. To avoid errors by moving the measuring
tool, check the position of the laser beams with
regard to the reference points upon re-levelling.
Working without Automatic Levelling
(see figure F)
For work without automatic levelling, push the
On/Off switch 4 to the “
on” position. When
the automatic levelling is switched off, the laser
lines flash continuously.
When automatic levelling is switched off, you
can hold the measuring tool freely in your hand
or place it on an inclinded surface. The laser
beams no longer necessarily run vertical to
each other.
Levelling Accuracy
Influences on Accuracy
The ambient temperature has the greatest
influence. Especially temperature differences
occurring from the ground upward can divert the
laser beam.
As thermal fluctuation is largest close to the
ground, the measuring tool, if possible, should
be mounted on a commercially available tripod
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. When the accuracy
of the horizontal point beams is within the
maximum allowed deviation, then the accuracy
of the vertical point beams and the laser lines
is thus also checked. Should the measuring
tool exceed the maximum deviation during one
of the tests, please have it repaired by a Bosch
after-sales service.
-9-
!
WARNING
GCL 25 Manual with translations.indd 9 4/24/12 8:29 AM