Bosch GRL 400 H Professional Original Instructions Manual page 22

OBJ_BUCH-1179-001.book Page 22 Thursday, August 5, 2010 10:04 AM
22 | English
Switching On and Off
Do not direct the laser beam at persons or
animals (especially not at their eye level),
and do not stare into the laser beam your-
self (not even from a distance.) Immediately
after switching on, the measuring tool sends
out the variable laser beam 4.
For switching on the measuring tool, briefly
press the On/Off button 2. The indicators 3, 1
and 6 light up briefly. The measuring tool imme-
diately starts the automatic levelling. During the
levelling, the levelling indicator 1 flashes green,
the laser does not rotate and flashes.
The measuring tool is levelled in as soon as lev-
elling indicator 1 lights up green continuously
and the laser beam is steady. After the levelling
is completed, the measuring tool automatically
starts in rotational operation.
The measuring tool exclusively operates with
fixed rotational speed in rotational operation,
which is also suitable for use of a laser receiver.
When factory set, the shock-warning function is
automatically switched on, and the shock-warn-
ing indicator 3 lights up green.
To switch off the measuring tool, briefly press
the On/Off button 2. When the shock warning
has actuated (shock-warning indicator 3 flashes
red), briefly press the On/Off button once to re-
start the shock-warning function, and then again
to switch off the measuring tool.
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 save the batteries, the measuring tool is au-
tomatically switched off when not within the
self-levelling range for more than 2 h or when
the shock warning is actuated for more than 2 h
(see "Automatic Levelling of the Rotational La-
ser Level", page 22). Reposition the measuring
tool and switch it on again.
2 610 A13 330 | (5.8.10)
Automatic Levelling of the Rotational
Laser Level
After switching on, the measuring tool checks
the horizontal position and automatically com-
pensates irregularities within the self-levelling
range of approx. 8 % (5°).
When the measuring tool is inclined by more
than 8 % after switching on or after a position
change, levelling in is no longer possible. In this
case, the rotor is stopped, the laser flashes and
levelling indicator 1 continuously lights up red.
Reposition the measuring tool and wait for it to
re-level. Without repositioning, the laser is auto-
matically switched off after 2 minutes and the
measuring tool after 2 hours.
When the measuring tool is levelled in, it contin-
uously checks the horizontal position. Automatic
re-levelling takes place after position changes. To
avoid faulty measurements, the rotor stops dur-
ing the levelling process, the laser flashes and
the levelling indicator 1 flashes green.
Shock-warning Function
The measuring tool has a shock-warning function;
after position changes or shock to the measuring
tool, or in case of ground vibrations, it keeps the
measuring tool from levelling in at changed
heights, and thus prevents vertical errors.
When factory set, the shock-warning function is
activated after switching on the measuring tool
(shock-warning indicator 3 lit). The shock warn-
ing is activated approx. 30 s after switching on
the measuring tool or switching on the shock-
warning function.
When the levelling-accuracy range is exceeded
after a position change of the measuring tool or
when heavy ground vibrations are detected, the
shock-warning function is actuated: The rota-
tion is stopped, the laser flashes, the levelling
indicator 1 goes out and the shock-warning indi-
cator 3 flashes red.
When the shock-warning function has actuated,
briefly press the On/Off button 2. The shock-
warning function is restarted and the measuring
tool starts the levelling. As soon as the measur-
ing tool is levelled in (the levelling indicator 1
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