Working Advice - CST/BERGER AL Serie Notice Originale

Checking the Levelling Accuracy in the
Horizontal Position
A free measuring distance of 30 m on a firm surface in
front of a wall is required for the check. A complete
measuring procedure 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 meas-
uring tool on.
– If required, change the grade setting for both the
X- and Y-axis to 0.00 %.
– After the levelling, mark the centre of the laser
beam on the wall (point I).
– 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 ver-
tical as possible above or below point I.
– 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.
On the measuring distance of 2 x 30 m = 60 m, the
maximum allowable deviation is:
60 m x ± 0.05 mm/m = ± 3 mm.
Consequently, the difference d between points I and
II for each of the two measurements may not exceed
3 mm.
2 610 A15 112 • 12.8.09
30 m
180˚
Checking the Levelling Accuracy in the Vertical
Position
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 tripod, 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 difference d between laser beam
and plumb bob rope at the bottom end of the rope
results in the deviation of the measuring tool to the
vertical line.
For a 10 m high measuring distance, the maximum
allowable deviation is:
10 m x ± 0.1 mm/m = ± 1 mm.
Thus, the difference d must not exceed 1 mm.

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 radiation.
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.
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