Hilti PM 4-M, Operating Instructions Manual, Page: 23 / 292

R = x (2)
30
RH [ft]
(d1 + d2) [inch]
4
R = x (1)
10
RH [m]
(d1 + d2) [mm]
4
8. Repeat the procedure after pivoting the tool through
180° and 270°.
NOTE The resulting 4 marks form a circle in which
the intersection of the diagonals d1 (1-3) and d2
(2-4) marks the exact center of the plumb point.
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 (2 mm at 10 m).
7.3.2 Checking the leveling of the horizontal laser
beam
10
1. Place the tool on an even, level surface approx. 20
cm from the wall (A) with the laser beam directed
toward the wall (A).
2. Mark the point of intersection of the laser lines on
the wall (A) with a cross (1).
3. Pivot the whole tool through 180° without using the
rotatable housing and mark the point of intersection
of the laser lines with a cross (2) on the wall opposite
(B).
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 point of intersection of the laser lines on
the wall (B) with a cross (3).
6. Pivot the whole tool through 180° without using the
rotatable housing and mark the point of intersection
of the laser lines with a cross (4) on the wall opposite
(A).
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 dif-
ferent 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 2 mm.
7.3.3 Checking perpendicularity (horizontal)
11 12 13
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 front 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 right-hand point of intersection
of the laser lines (d1).
3. Pivot the tool clockwise through exactly 90° (as seen
from above). The reference point must remain in the
center of the reference cross and the left-hand point
of intersection of the laser lines must lie exactly on
the vertical line of the target plate (a).
4. Mark the right-hand point of intersection of the laser
lines (d2) on the target plate (c).
5. Then mark the center point (d3) of the front point of
intersection of the laser lines on the target plate (b).
NOTE The horizontal distance between d1 and d3
must be no greater than 2 mm at a working distance
of 5 m.
6. Pivot the tool clockwise through exactly 180° (as
seen from above). The reference point must remain
in the center of the reference cross and the right-
hand point of intersection of the laser lines must lie
exactly on the vertical line of the first target plate (a).
7. Then mark the left-hand point of intersection of the
laser lines (d4) on the target plate (c).
NOTE The horizontal distance between d2 and d4
must be no greater than 2 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 2 mm at a working distance of 5 m.
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 2 mm at a working distance of 5 m.
7.3.4 Checking the accuracy of the horizontal
line
14 15
1. Place the tool at the edge of a room with a length of
at least 10 m.
NOTE The floor surface must be even 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 front 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 whole tool clockwise through 45° (as seen
from above) without using the rotatable housing.
The reference point 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 whole tool anti-clockwise through 90° (as
seen from above) without using the rotatable hous-
ing. The reference point must remain on the center
of the reference cross.
en
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Printed: 27.10.2015 | Doc-Nr: PUB / 5130868 / 000 / 03