8. Mark the mid points of d1 and d2.
If the reference points 1 and 3 are located on
different sides of the mid point, then subtract d2
from d1.
If the reference points 1 and 3 are located on the
same side of the mid point, then add d1 and d2
together.
9. Divide the result by twice the length of the room
(room length x 2).
The maximum permissible error is 3 mm at 10 m.
7.3.3 Checking leveling of the lateral beams
Repeat the procedure and calculate the accuracy of
each of the two perpendicular beams as described at
7.3.2.
7.3.4 Checking perpendicularity
(horizontal)
1. Position the tool with the lower plumb beam on
the center of a reference cross in the middle of a
room at a distance of approx. 5 meters from the
walls so that the center of the vertical laser line
lies exactly on the vertical line of the first target
plate (a).
2. Attach a second target plate or sheet of paper (b)
to the wall at the half-way position (as shown in
the illustration). Mark the mid point (d1) of the
right-hand perpendicular beam.
3. Pivot the tool clockwise through exactly 90° (as
seen from above). The lower plumb beam must
remain in the center of the reference cross and
the center of the left-hand perpendicular beam
must then lie exactly on the vertical line of target
plate (a).
4. Mark the center point (d2) of the right-hand
perpendicular laser beam on target plate (c).
5. Mark the mid point (d3) of the point of intersection
of the laser lines on target plate (b) or the sheet
of paper (from step 7).
NOTE The horizontal distance between d1 and
d3 must be no greater than 3 mm at a working
distance of 5 m.
6. Pivot the tool clockwise through exactly 180° (as
seen from above). The lower plumb beam must
remain in the center of the reference cross and
the center of the right-hand perpendicular beam
must then lie exactly on the vertical line of target
plate (a).
7. Then mark the center point (d2) of the left-hand
perpendicular laser beam on target plate (c).
NOTE The horizontal distance between d2 and
d4 must be no greater than 3 mm at a working
distance of 5 m.
NOTE If d3 is to the right of d1, the sum of the
horizontal distances d1-d3 and d2-d4 must be no
greater than 3 mm at a working distance of 5m.
NOTE If d3 is to the left of d1, the difference
between the horizontal distances d1-d3 and d2-
d4 must be no greater than 3 mm at a working
distance of 5m.
7.3.5 Checking the horizontal lines for
curvature
1. Place the tool at the edge of a room with a length
of at least 10 m.
NOTE The floor surface must be smooth and
level.
2. Switch on all laser beams.
3. Set up a target plate at a distance of at least 10 m
from the tool, so that the point of intersection of
the laser lines lies in the center of the target plate
(d0) and the vertical line on the target plate runs
exactly through the middle of the vertical laser
line.
4. Mark the mid point of the lower plumb beam on
the floor (reference cross).
5. Pivot the tool clockwise through 45° (as seen
from above). The lower plumb beam must remain
on the center of the reference cross.
6. Then mark the point (d1) on the target plate where
the horizontal laser line strikes the vertical line on
the target plate.
7. Pivot the tool counterclockwise through 90°. The
lower plumb beam must remain on the center of
the reference cross.
8. Then mark the point (d2) on the target plate where
the horizontal laser line strikes the vertical line on
the target plate.
9. Measure the following vertical distances: d0-d1,
d0-d2 and d1-d2.
NOTE The greatest measured vertical distance
must be no more than 5 mm at a working distance
of 10 m.
en
20
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