Checking The Vertical Levelling Accuracy - Bosch GPL 3 Professional Original Instructions Manual

OBJ_BUCH-807-002.book Page 15 Tuesday, September 30, 2008 1:13 PM
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d
– Rotate the measuring tool by 180° without
changing the height. Allow it to level in and
mark the centre point of the laser beam on
wall A (point III). Take care that point III is as
vertical as possible above or below point I.
– The difference d of both marked points I
and III on wall A indicates the actual height
deviation of the measuring tool.
On the measuring distance of 2 x 20 m = 40 m,
the maximum allowable deviation is:
40 m x ± 0.3 mm/m = ± 12 mm.
Thus, the difference d between points I and III
may not exceed 12 mm (max.).

Checking the Vertical Levelling Accuracy

For this check, a free measuring distance of
approx. 5 m between floor and ceiling on a firm
surface is required.
– Draw a straight line on the ceiling.
– Mount the measuring tool to the holder or
a tripod. Switch the measuring tool on and
rotate it in such a manner that the bottom
plumb beam can be seen on the floor.
Bosch Power Tools
– Position the measuring tool in such a manner
that the upper plumb beam points against
B
180˚
the line on the ceiling. Allow the measuring
tool to level in. Mark the centre of the upper
laser point on the line on the ceiling (point I).
Also, mark the centre of the laser point on
the floor (point II).
– Rotate the measuring tool by 180°. Position
it in such a manner that the centre of the bot-
tom laser point is directed on the already
marked point II and the upper laser point is
directed against the line on the ceiling. Allow
the measuring tool to level in. Mark the cen-
tre of the upper laser point on the line on the
ceiling (point III).
– The difference d of both marked points I and
III on the ceiling results in the actual devia-
tion of the measuring tool to the plumb line.
On the measuring distance of 2 x 5 m = 10 m,
the maximum allowable deviation is:
10 m x ± 0.3 mm/m = ± 3 mm.
Thus, the difference d between points I and III
must not exceed 3 mm (max.).
5 m
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