Checking The Levelling Accuracy In The Vertical Position (Grl 500 Hv); Calibrating The Measuring Tool; X-Axis Calibration - Bosch GRL Professional 500 H Originalbetriebsanleitung

– Rotate the measuring tool by 180°, allow it to level in and
mark the centre point of the laser beam on the wall
(point II). Take care that point II is as vertical as possible
above or below point I.
d
– The difference d of both marked points I and II on the wall
results in the actual height deviation of the measuring tool
for the measured axis.
Repeat the measuring procedure for the other axis. For this,
turn the measuring tool by 90° before starting the measuring
procedure.
The maximum permitted deviation over the measuring dis-
tance of 2 x 30 m = 60 m is as follows:
60 m x ±0.05 mm/m = ±3 mm.
The difference d between points I and II must therefore be
maximum 6 mm in each of the two measuring procedures.
Checking the Levelling Accuracy in the Vertical Position
(GRL 500 HV)
A free measuring distance of 10 m on a firm surface in front of
a wall is required for the check. Fasten a plumb bob rope to
the wall.
– Mount the measuring tool in the vertical position onto a tri-
pod, or place it on a firm and level surface. Switch the
measuring tool on and allow it to level.
– Align the measuring tool such that the laser beam impinges
centrally on the plumb bob rope at the upper end. The dif-
ference d between laser beam and plumb bob rope at the
bottom end of the rope results in the deviation of the meas-
uring tool to the vertical line.
The maximum permitted deviation over a 10 m high measur-
ing distance is as follows:
10 m x ±0.1 mm/m = ±1 mm.
The difference d must therefore be maximum 1 mm.
Bosch Power Tools
180°
d

Calibrating the Measuring Tool

 Perform calibration of the measuring tool meticulously
or have the measuring tool checked by a Bosch custom-
er service agent. Inaccurate calibration leads to incorrect
measuring results.
Note: After calibration, the indicators for checking calibration
are not displayed again until the cause of the calibration warn-
ing occurs again.
A free measuring distance of at least 30 m on a firm surface in
front of a straight wall is required for the calibration.
Always calibrate all axes (GRL 500 H: X-axis and Y-axis;
GRL 500 HV: X-axis, Y-axis and Z-axis).

X-Axis Calibration

– Mount the measuring tool in the horizontal position on a tri-
pod 63 (accessory).
– Place the tripod 30 m in front of the wall. The X-axis indica-
tor imprinted on the measuring tool must be pointing per-
pendicular to the wall.
– Switch the measuring tool on.
– Simultaneously press the calibration
button 25 and the slope button 18 for
approx. 2 s.
The symbol for calibrating the X-axis is
shown on the display.
The out-of-level indicator 37 flashes dur-
ing automatic levelling.
– Wait until the measuring tool is levelled in.
– Use the laser receiver to find the centre line and transfer
the height "X1" of the centre line onto the wall.
– Turn the measuring tool 180° without adjusting the height
of the tripod.
– Wait until the out-of-level indicator 37 stops flashing and
the measuring tool is levelled in.
– Use the laser receiver to find the centre line and transfer
the new height "X2" of the centre line onto the wall.
– Determine the exact centre between the centre lines "X1"
and "X2" and position the laser receiver on it using the cen-
tre mark 16.
– Press the slope button 18 or 20 until
/ the centre line indicator 43 lights up
continuously. If the audio signal is
switched on, a continuous tone sounds.
– Press the calibration button 25 to save
the calibration.
The symbol for completing calibration is
shown on the display.
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