Centerlock Mode (Grl 650 Chvg); Mask Mode (See Figure C); Accuracy Check Of The Measuring Tool; Influences On Accuracy - Bosch GRL 600 CHV Notice Originale

CenterLock mode (GRL 650 CHVG)
In CenterLock mode, the measuring tool automatically at-
tempts to align the laser beam to the centre line of the laser
receiver by moving the rotation head up and down. In con-
trast to the CenterFind mode, the position of the laser re-
ceiver is continuously checked and the inclination of the
measuring tool is automatically adjusted. The slope meas-
urements are not shown on the display.
When working in CenterLock mode, take care to en-
u
sure that the measuring tool and laser receiver are not
accidentally moved. The automatic adjustment of the in-
clination for every position change can result in measure-
ment errors.
The laser beam can be aligned to the X‑axis or the Y‑axis of
the measuring tool.
CenterLock mode is started and finished at the laser re-
ceiver. For this, please read and observe the operating in-
structions for the laser receiver.
During the search, the CenterLock
symbol for one or both axes will ap-
pear on the display of the measuring
tool and the status indicator (12) will
flash red.
If the laser beam could be aligned to
the centre line of the laser receiver,
the CenterLock symbol for one or
both axes will appear on the start
screen. The slope measurements are
not shown.
If the laser beam could not be aligned
with the centre line of the laser re-
ceiver, the rotation of the laser beam
is stopped and an error message ap-
pears in the display. Press any button
to close the error message. The cor-
responding axis is levelled in again to
0 %.
Check whether the measuring tool and laser receiver have
been set up correctly, and restart the mode. The laser re-
ceiver must be situated within the pivoting range of ±8.5 %
of the measuring tool.
Note: When using CenterLock mode, the setting of both
axes can change, even if one of the axes has not been
aligned with the laser receiver.
Mask mode (see figure C)
In rotational operation, the variable laser beam (8) can be
switched off for one or more quadrants of the rotational
plane. This makes it possible to limit the risk related to laser
beams to certain areas. Interference from the laser beam
that affects other tools or interference with the laser receiver
by unintended reflections can also be avoided.
The switching off of individual quadrants can only be con-
trolled by using the Bosch Levelling Remote App. The
Bosch Power Tools
quadrants in which the laser beam is visible can be seen in
the laser operating mode indicator (a) on the start screen.

Accuracy Check of the Measuring Tool

The following tasks should be performed only by well-trained
and qualified persons. The legalities with regard to perform-
ing an accuracy check or calibration of a measuring tool must
be known.

Influences on Accuracy

The largest influence is exerted by the ambient temperature.
In particular, temperature differences that occur from the
ground upwards can refract the laser beam.
In order to minimise thermal influences resulting from heat
rising from the floor, it is recommended that you use the
measuring tool on a tripod. In addition, position the measur-
ing tool in the centre of the work surface, wherever this is
possible.
In addition to external influences, device-specific influences
(e.g. falls or heavy impacts) can also lead to deviations. For
this reason, check the levelling accuracy each time before
beginning work.
If the measuring tool exceeds the maximum deviation for the
measuring procedures described below, perform a calibra-
tion (see "Calibrating the measuring tool", page 48) or have
the measuring tool checked by a Bosch customer service
agent.

Checking the levelling accuracy in a horizontal position

For a reliable and precise result, it is recommended that you
check the levelling accuracy on a free measuring distance
of 30 m on firm ground in front of a wall. Carry out a com-
plete measuring procedure for each of the two axes.
– Mount the measuring tool in a horizontal position 30 m
from the wall on a tripod, or place it on a firm, level sur-
face. Switch on the measuring tool.
30 m
– Once levelling is complete, mark the centre of the laser
beam on the wall (point Ⅰ).
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1 609 92A 6AE | (28.05.2021)