Selecting The Setting Of The Centre Line Indicator; Direction Indicators; Strobe Shield Tm Protection; Marking - Bosch Professional GRL 500 HV Manual

OBJ_BUCH-1960-004.book Page 43 Thursday, October 13, 2016 12:38 PM

Selecting the Setting of the Centre Line Indicator

You can specify the accuracy with which the position of the la-
ser beam is indicated as "centred" on the reception area.
The default setting in the delivery condition is
[Measuring accuracy "medium/3 mm"].
Example
The setting for measuring accuracy is saved when the tool is
switched off.

Direction Indicators

The position of the laser beam in the reception area 26 is indi-
cated:
– on the display 15 on the front and rear side of the laser re-
– optionally by the audio signal.
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.
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.
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.
Strobe shield
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.
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– Press the measuring accuracy setting
button 23 repeatedly until the desired
setting is reached.
The measuring accuracy level "fine"/"me-
dium"/"coarse" and the exact value are
shown on the display.
ceiver by the direction indicator "move upward" 39, the di-
rection indicator "move downward" 40 or the centre line
indicator 43,
When the centre mark 16 is approached, only the tip of the
direction indicator 39 is shown.
When the centre mark 16 is approached, only the tip of the
direction indicator 40 is shown.
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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.

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

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 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.
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