R = x (2)
30
RH [ft]
(d1 + d2) [inch]
4
R = x (1)
10
RH [m]
(d1 + d2) [mm]
4
9. Calculate the accuracy as described in section
7.3.1.1.
7.3.1.1 Calculation of accuracy
The result (R) provided by this formula (RH = room
height) refers to the tool’s accuracy “in mm at 10 m”
(formula (1)). This result (R) should be within the
specification for the tool (3 mm at 10 m).
7.3.2 Checking leveling of the forward beam 6
1. Place the tool on a smooth, level surface approx.
20 cm from the wall (A) with the laser beam
directed toward the wall (A).
2. Mark the position of the laser point on the wall
(A) with a cross.
3. Pivot the tool through 180° and mark the position
of the laser point on the opposite wall (B) with a
cross.
4. Place the tool on an even, level surface approx. 20
cm from the wall (B) with the laser beam directed
toward the wall (B).
5. Mark the position of the laser point on the wall
(B) with a cross.
6. Pivot the tool through 180° and mark the position
of the laser point on the opposite wall (A) with a
cross.
7. Measure the distances d1 between 1 and 4 and
d2 between 2 and 3.
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 perpendicularity
(horizontal) 789
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 vertical laser line lies exactly in
the center of the laser point.
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 position of the laser point (d3) on the
target plate b or on a sheet of paper as at 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.
en
17
(19 pages)
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