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Plumb Accuracy
To check the accuracy of the plumb:
1.
Find a site that has a known vertical height X. Put unit on floor stand and place on the floor.
2.
Place a cross mark at the bottom of the site.
3.
Center the down laser on both axes of the cross mark. See
4.
Place a cross mark at the point where the up point laser intersects the target area at the top of the site.
5.
Turn the Product 180 ° on its center.
6.
Recenter the down point laser on Mark 1 and mark where the up point laser intersects the target area at the top site.
3
7.
The distance measured between
Compare your measurement to column Y in the table below @ the corresponding X ceiling height. See
V
d
≤ Y @ X
2
1
2
X
Figure 7. Plumb Accuracy
1
2
3
and
is equal to Vd. Divide Vd by two to calculate the difference of error.
Y
in.
1/32
1/24
1/16
Figure
7.
3
1 2 3 4
= V
2
3
d
1
Table 5.
@
mm
0.75
1.0
1.5
Point Laser Levels
Plumb Accuracy
2
Table
X
ft.
m
7.5
2.29
10.0
3.05
15.0
4.57
5.
15
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