Accuracy Check Of The Measuring Tool; Working Advice - CST/BERGER RL25H Manual Original

– To switch on the shock-warning function, press the shock-
warning button 8. The shock-warning indicator 7 lights up
green, and the shock-warning function is activated after 30
seconds.

Accuracy Check of the Measuring Tool

Influences on Accuracy
The ambient temperature has the greatest influence. Especially
temperature differences occurring from the ground upward can
divert the laser beam.
The deviations play a role in excess of approx. 20 m measuring
distance and can easily reach two to four times the deviation 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 possible,
also set up the measuring tool in the centre of the work area.
Checking the Levelling Accuracy
Apart from exterior influences, device-specific influences (such
as heavy impact or falling down) can lead to deviations. There-
fore, check the accuracy of the measuring tool each time before
starting your work.
A free measuring distance of 20 m on a firm surface between
two walls A and B is required for the check. A reversal measure-
ment must be carried out over both axes X and Y (each positive
and negative; 4 complete measurements).
– Mount the measuring tool in the horizontal position onto a tri-
pod 25 (accessory) or place it on a firm and level surface
near wall A. Switch the measuring tool on.
A
– After the levelling, mark the centre of the laser beam on wall
A (point I).
A
180°
– Rotate the measuring tool by 180°, allow it to level in and
mark the centre point of the laser beam on the opposing wall
B (point II).
– Without turning the measuring tool, position it close to wall
B. Switch the measuring tool on and allow it to level in.
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B
20 m
B
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A
– Align the height of the measuring tool (using the tripod or by
propping), so that the centre of the laser beam runs exactly
against the previously marked point II on wall B.
A
d
– Rotate the measuring tool by 180° without changing the
height. Allow it to level in and mark the centre point of the la-
ser beam on wall A (point III). Take care that point III is as
vertical as possible above or below point I.
The difference d of both marked points I and III on wall A
amounts to the actual deviation of the measuring tool for the
measured axis.
– Repeat the measuring procedure for the other three axes.
For this, turn the measuring tool prior to each measuring pro-
cedure by 90°.
The maximum permitted deviation over the measuring section
of 2 x 20 m = 40 m is as follows:
40 m x ±0.08 mm/m = ±4 mm.
The difference d between points I and III must therefore be
maximum 3.2 mm in each of the four measuring procedures.
If the measuring tool should exceed the maximum deviation in
any one of the four measuring procedures, have it checked at a
Bosch after-sales service agent.

Working Advice

 Always use the centre of the laser point for marking. The
size of the laser point changes with the distance.
Laser Viewing Glasses (Accessory)
The laser viewing glasses filter out the ambient light. This makes
the red light of the laser appear brighter for the eyes.
 Do not use the laser viewing glasses as safety goggles.
The laser viewing glasses are used for improved visualisation
of the laser beam, but they do not protect against laser radi-
ation.
 Do not use the laser viewing glasses as sun glasses or in
traffic. The laser viewing glasses do not afford complete
UV protection and reduce colour perception.
B
B
180°
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