Working Advice - Bosch GPL 3 Professional Notice Originale

12 | English
Checking the Vertical Levelling Accuracy
For this check, a free measuring distance of approx. 5 m be-
tween 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.
– Position the measuring tool in such a manner that the up-
per plumb beam points against the line on the ceiling. Al-
low 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 bottom laser point is direct-
ed on the already marked point II and the upper laser point
is directed against the line on the ceiling. Allow the meas-
uring tool to level in. Mark the centre 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 ceil-
ing results in the actual deviation 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 ex-
ceed 3 mm (max.).
1 609 92A 0KW | (16.5.14)
5 m
d

Working Advice

 Always use the centre of the laser point for marking.
The size of the laser point changes with the distance.
Attaching with the Holder
To fasten the measuring tool on the holder 8, screw the lock-
ing screw 9 of the holder into the 1/4" tripod mount 6 on the
measuring tool and tighten. To rotate the measuring tool on
the holder, slightly loosen the screw 9.
– Rotate the measuring tool on the holder 8 sideward or to-
ward the rear to make the bottom plumb beam visible.
– Rotate the measuring tool on the holder 8 to project
heights with the horizontal laser beam.
With the holder 8, the measuring tool can be attached as
follows:
– Mount the holder 8 to the tripod 18 or a commercially
available camera tripod via the 1/4" tripod mount 13. For
fastening to a commercially available construction tripod,
use the 5/8" tripod mount 14.
– The holder 8 can be fastened to steel parts via the magnets
12.
– The holder 8 can be fastened to drywalls or wood walls
with screws. For this, insert screws with a minimum length
of 60 mm into the screw holes 10 of the holder.
– The holder 8 can also be fastened to pipes or similar beams
using a commercially available strap by threading it
through the opening 11 for strap attachment.
Working with the Tripod (Accessory)
A tripod 18 offers a stable, height-adjustable measuring sup-
port. Place the measuring tool via the tripod mount 6 onto the
1/4" male thread of the tripod and screw the locking screw of
the tripod tight.
Working with the Measuring Plate (Accessory)
With the measuring plate 15, it is possible to project the laser
mark onto the floor or the laser height onto a wall.
With the zero field and the scale, the offset or drop to the re-
quired height can be measured and projected at another loca-
tion. This eliminates the necessity of precisely adjusting the
measuring tool to the height to be projected.
The measuring plate 15 has a reflective coating that enhances
the visibility of the laser beam at greater distances or in
intense sunlight. The brightness intensification can be seen
only when viewing, parallel to the laser beam, onto the mea-
suring plate.
Laser Viewing Glasses (Accessory)
The laser viewing glasses filter out the ambient light. This
makes the red light of the laser appear brighter for the eyes.
 Do not use the laser viewing glasses as safety goggles.
The laser viewing glasses are used for improved visualisa-
tion of the laser beam, but they do not protect against laser
radiation.
 Do not use the laser viewing glasses as sun glasses or in
traffic. The laser viewing glasses do not afford complete
UV protection and reduce colour perception.
Bosch Power Tools