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ACCURACY CONTROL
Monitor horizontal levelling
1. Choose a room ±10 m long
2. Place the instrument next to wall no. 1.
3. Switch on the instrument and let it self-level.
4. Mark the horizontal line in the middle of the
cross on wall no 1.
5. Turn the instrument through 180° and mark
the laser beam in the middle of the cross on
wall no. 2.
6. Move the instrument as close as possible to
wall no. 2.
7. Adjust the height of the laser so that the
middle of the laser cross is on the wall no. 2
marker.
8. Then turn the instrument through 180° and
note the difference between the middle of
the laser cross and the marker on wall no. 1.
9. This difference should not exceed 2 mm.
10. NB: The tolerance depends on the distance
of the walls between which the inspection
has been carried out. This distance should
be multiplied by 2. Hence, if the instrument
has an accuracy of 1 mm / 10 m, then in our
example the calculation is: 10 m distance x 2
= 20 m. Tolerance is 2 mm / 20 m.
Vertical laser line
Place the instrument approximately 5 m from a
wall.
Place a 2 m long plumb-line against the wall.
Switch on the instrument and let it self-level.
Place the vertical laser line on the plumb-line.
This should be 1 mm in our example.
NB: If your instrument does not reach the re-
quired tolerance, it should be returned to your
service centre or to your reseller for service. Re-
pairs carried out by unauthorised personnel will
automatically invalidate the guarantee.
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