Checking The Levelling Accuracy In The Vertical Position; Calibrating The Measuring Tool; X-Axis And Y-Axis Calibration - Bosch GRL 600 CHV Anwenderhandbuch- Originalbetriebsanleitung

48 | English
d
– Turn the measuring tool 180° without adjusting the
height. Allow it to level in and mark the centre point of the
laser beam on the wall (point Ⅱ). Ensure that point Ⅱ is
vertically over or under point Ⅰ.
Repeat the measuring process for the other axis. To do this,
turn the measuring tool by 90° before beginning the meas-
urement.
The maximum permitted deviation on the 30 m measuring
distance is as follows: ±1.5 mm. The discrepancy d between
points Ⅰ and Ⅱ must therefore amount to no more than 3 mm
for each of the two measuring processes.

Checking the levelling accuracy in the vertical position

For this check, you will need a free measuring distance on
firm ground in front of a 10-metre tall wall. Fix a plumb line
to the wall.
– Position the measuring tool in the vertical position on a
firm, level surface. Switch the measuring tool on and al-
low it to level in.
– Set up the measuring tool so that the laser beam meets
the plumb line at the exact centre of the upper end. The
discrepancy d between the laser beam and the plumb line
at the lower end of the line reveals the measuring tool's
deviation from the vertical.
For a 10 m high measuring distance, the maximum permit-
ted deviation is as follows: ±1 mm. The discrepancy d must
therefore be no more than 1 mm.

Calibrating 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.
1 609 92A 6AE | (28.05.2021)
Perform calibration of the measuring tool with ex-
u
treme precision or have the measuring tool checked
180° by a Bosch customer service agent. Inaccurate calibra-
tion leads to incorrect measuring results.
Only start the calibration if you have to perform a cal-
u
ibration of the measuring tool. As soon as the measur-
ing tool is in calibration mode, you must perform the cal-
ibration meticulously to the end in order to ensure that no
incorrect measuring results are produced afterwards.
Check the levelling accuracy after every calibration (see
"Accuracy Check of the Measuring Tool", page 47). If the de-
viation is outside the maximum permitted limits, have the
measuring tool checked by a Bosch customer service agent.

X-axis and Y-axis Calibration

The GRL 600 CHV can only be calibrated using the LR 60
laser receiver, and the GRL 650 CHVG can only be calibrated
using the LR 65 G. The laser receiver must be connected to
the measuring tool via Bluetooth® (see "Establishing a con-
nection to the remote control/laser receiver", page 41).
The positions of the measuring tool and laser receiver cannot
be changed during calibration (with the exception of the
alignments or rotations described). Therefore position the
measuring tool on a firm, level surface and secure the laser
receiver.
Calibration should be performed via the Bosch Levelling
Remote App if possible. There is less likelihood of error
when controlling the tool via the app. Otherwise, the meas-
uring tool's position can be altered if buttons are pressed
without due care.
For calibration without the app, the corresponding buttons
on the measuring tool must be pressed. It is not possible to
use the remote control during calibration.
A free measuring distance of 30 m on a firm surface is re-
quired. If no such measuring distance is possible, calibration
can also be performed with lower levelling accuracy on a
measuring distance of 15 m.
Mounting the measuring tool and the laser receiver for
calibration:
Mount the measuring tool in the horizontal position 30 m or
d
15 m from the laser receiver on the tripod (43) or position it
on a firm, level surface.
Secure the laser receiver at the correct height:
– Either to a wall or to another surface by means of magnets
or the suspension hook on the laser receiver,
– or to a securely fastened aid with the holder for the laser
receiver.
To do this, consult the operating instructions for the laser re-
ceiver.
Bosch Power Tools