Strobe Shieldtm Protection; Marking; Display Illumination; Attaching With The Measuring Rod Clamp (See Figure G) - Bosch GRL Professional 500 H Originalbetriebsanleitung

42 | English
Laser receiver too low: If the laser beam runs through the up-
per half of the reception area 26, then the direction indicator
"move upward" 39 lights up and the plus value of the relative
height display 32 shows how much the laser receiver has to
be moved upwards.
If the audio signal is switched on, a signal sounds in a slow
rhythm.
– Move the laser receiver upwards in the arrow direction.
When the centre mark 16 is approached, only the tip of the
direction indicator 39 is shown.
Laser receiver too high: If the laser beam runs through the
lower half of the reception area 26, then the direction indica-
tor "move downward" 40 lights up and the minus value of the
relative height display 32 shows how much the laser receiver
has to be moved downwards.
If the audio signal is switched on, a signal sounds in a fast
rhythm.
– Move the laser receiver downwards in the arrow direction.
When the centre mark 16 is approached, only the tip of the
direction indicator 40 is shown.
Laser receiver centred: If the laser beam runs through the
reception area 26 at the height of the centre mark 16, then
the centre line indicator 43 lights up. If the audio signal is
switched on, a continuous tone sounds.
If the measuring tool is moved so that the laser beam leaves
the reception area 26 again, the most recently displayed di-
rection indicator 39 or 40 will flash for approx. 5 s.
TM
Strobe shield Protection
The laser receiver has electronic filters for strobe light. The fil-
ters protect against, for example, interference from the warn-
ing lights of construction machinery.

Marking

When the laser beam runs through the centre of the reception
area 26, its height can be marked at the centre mark 16 left
and right of the laser receiver.
When marking, take care to align the measuring tool exactly
vertical (for horizontal laser beam), or horizontal (for vertical
laser beam), as otherwise the marks are offset with respect to
the laser beam.

Display Illumination

The default setting in the delivery condition is
[Display illumination activated].
If no button is pressed after approx. 30 seconds, the display
illumination goes out.
When any button is pressed or when the laser beam hits the
reception area, the display illumination is switched back on.
– To switch off the display illumination, simultane-
ously press the On/Off button 17 and the audio
signal/volume button 24.
The setting for display illumination is saved when the tool is
switched off.
2 610 031 676 | (15.7.14)

Attaching with the Measuring Rod Clamp (see figure G)

With the measuring rod clamp 53, the laser receiver can be
fastened to a construction laser measuring rod 55 (accesso-
ry) as well as to other auxiliary equipment with a width of up
to 65 mm.
– Fit the slot 58 to the measuring rod clamp 53 using the fas-
tening screw 56.
– Loosen the locking screw 54, slide the measuring rod
clamp onto the construction laser measuring rod 55, for
example, and retighten the locking screw 54.
– The measuring rod clamp 53 can be horizontally aligned
with help of the spirit level 57.
A measuring tool mounted out-of-level leads to faulty
measurements.
– Slide the laser receiver into the slot 58.

Accuracy Check of the Measuring Tool

Influences on Accuracy

The ambient temperature has the greatest influence. Espe-
cially temperature differences occurring from the ground up-
ward can divert the laser beam.
In addition to external influences, device-specific influences
(e.g. falls or heavy impacts) can also lead to deviations. For
this reason, check the calibration each time before beginning
work.
The deviations play a role in excess of approx. 20 m measur-
ing distance and can easily reach two to four times the devia-
tion at 100 m.
Because the largest difference in temperature layers is close
to the ground, the measuring tool should always be mounted
on a tripod when measuring distances exceeding 20 m. If pos-
sible, also set up the measuring tool in the centre of the work
area.
If the measuring tool exceeds the maximum deviation in one
of the four measuring procedures, perform a calibration (see
"Calibrating the Measuring Tool", page 43) or have the meas-
uring tool checked by a Bosch customer service agent.
Checking the Levelling Accuracy in the Horizontal Posi-
tion
A free measuring distance of 30 m on a firm surface in front of
a wall is required for the check. A complete measuring proce-
dure each must be carried out for the X- and Y-axis.
– Mount the measuring tool in the horizontal position onto a
tripod or place it on a firm and level surface at a distance of
30 m to the wall. Switch the measuring tool on.
– After the levelling, mark the centre of the laser beam on the
wall (point I).
30 m
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