Accuracy Check Of The Measuring Tool - Bosch GRL 500 H Consignes De Fonctionnement/Sécurité

the desired setting is reached.
Example: The measuring accuracy level
"fine"/"medium"/"coarse" and
the exact value are shown on
the display.
The setting for measuring accuracy is saved
when the tool is switched off.
Note: Accuracy for mm/decimal inches are
different from accuracy for fractional inches.
Verify accuracy after changing measuring
unit
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, simultaneously 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 leveling rod
55 (accessory) as well as to other auxiliary
equipment with a width of up to 2.5-in (65
mm).
– Fit the slot 58 to the measuring rod clamp
53 using the fastening 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.
If the receiver is mounted or held out-of-
level, it can lead to faulty measurements.
– Slide the laser receiver into the slot 58.
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Accuracy Check of the
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Influences on Accuracy
The ambient temperature has the greatest
influence. Especially temperature differences
occurring from the ground upward 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. 65 ft (20 m) measuring distance
and can easily reach two to four times the
deviation at 330 ft (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 exceed 65 ft (20
m). If possible, also set up the measuring tool
in the center 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 28) or
have the measuring tool checked by a Bosch
customer service agent.
! WARNING
periodically check the accuracy of the
measuring tool as work progresses.
Always check the accuracy of the
measuring tool after it has been dropped
or subject to extreme temperatures and
temperature variations.
Checking the Leveling Accuracy in the
Horizontal Position
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A free measuring distance of 100 ft (30 m) on
a firm surface in front of a wall is required for
the check. A complete measuring procedure
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 100 ft
(30 m) to the wall. Switch the measuring
tool on.
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Measuring Tool
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It is the user's
responsibility to
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