Leveling Accuracy - Bosch GRL 245 HV Operating/Safety Instructions Manual

Automatic leveling
Overview
After switching on, the laser tool automatically
detects the horizontal or vertical position. To
change between the horizontal and vertical
position, switch the laser tool off, reposition it
and switch on again.
After switching on, the laser tool checks
the horizontal and vertical position and
automatically levels out any unevenness within
the self-leveling range of
approx. 8 % (5°).
When the laser tool is inclined by more than
8 % after switching on or after a position
change, leveling in is no longer possible. In this
case, the rotor is stopped, the laser flashes
and leveling indicator
3
red. Reposition the laser tool and wait for it
to re-level. Without repositioning, the laser is
automatically switched off after 2 minutes and
the laser tool after 2 hours.
When the laser tool is leveled in, it continuously
checks the horizontal and
vertical position. Automatic re-leveling takes
place after position changes. To avoid faulty
measurements, the rotor stops during the
leveling process, the laser flashes and the
leveling indicator 3 flashes green.
Shock-warning Function
The laser tool has a shock-warning
function; after position changes or
shock to the laser tool, or in case of ground
vibrations, it keeps the laser tool from leveling in
at changed heights, and thus prevents vertical
errors.
To switch on the shock-warning function,
press the shock-warning button
shock-warning indicator
up green, and the shock-warning function is
activated after
30 seconds.
When the leveling-accuracy range is exceeded
after a position change of the laser tool or
when heavy ground vibrations are detected,
the shock-warning function is actuated: The
rotation is stopped, the laser flashes, the
leveling indicator goes out and the shock-
3
warning indicator flashes red. The current
1
operating mode is stored.
After the shock-warning function has actuated,
press the shock-warning button

Leveling Accuracy

continuously lights up
. The
2
continuously lights
1
.
2
The shock-warning function is restarted and
the laser tool starts the leveling. As soon as
the laser tool is leveled in (leveling indicator
continuously lights up green), it starts in the
stored operating mode. Now, check the height
of the laser beam with a reference point and
correct the height, if required.
When the function is not restarted by pressing
button 2 after the shock-warning function has
actuated, the laser is automatically switched off
after 2 minutes and the laser tool after 2 hours.
To switch off the shock-warning function,
press shock-warning button
the shock warning is actuated (shock-warning
indicator 1 flashing red) press it twice. When the
shock-warning function is shut off, the shock
warning indicator 1
Influences on Accuracy
The ambient temperature has the greatest
influence. Especially temperature differences
occurring from the ground upward can divert
the laser beam.
The deviations play a role in excess of approx.
65 ft measuring distance and can easily reach
two to four times the deviation at 328 ft.
Because the largest difference in temperature
layers is close to the ground, the laser tool
should always be mounted on a tripod when
measuring distances exceeding 65 ft. If
possible, also set up the laser tool in the center
of the work area.
Accuracy Check
Apart from exterior influences, device-specific
influences (such as heavy impact or falling
down) can lead to deviations. Therefore, check
the accuracy of the laser tool each time before
starting your work.
For the accuracy check, an unobstructed
measuring distance of 65 ft on firm ground
between two walls A and B is required. With
the laser tool in the horizontal position, a transit
measurement is to be carried out across both
axes X and Y (both positive and negative)
(altogether 4 complete measurements).
– Mount the laser tool in the horizontal
position onto a tripod
place it on a firm and level surface near
wall A. Switch the laser tool on.
-14-
once, or, when
2
goes out.
(accessory) or
21
3