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Vertical Alignment
B
Switch on the construction laser and, as shown in the illustration, align the
bubble level (2) 7 by rotating the adjustment knob (2) 10 up or down until
level.
Note: When working over an extended period of time, check the position
of the level bubbles regularly.
Levelling Accuracy
Influences on the Accuracy
The largest influence is exerted by the ambient temperature.
Especially temperature differences occurring from the ground
upwards can deflect the laser beam.
The deviations are significant at a distance of approx. 20 m and can
double or quadruple at a distance of 100 m.
Since the temperature gradient near the floor is the greatest, a tripod
should always be used when working at distances over 20 m. In addi-
tion, the unit should always be set up in the middle of the working area.
Accuracy Check of the Unit
In addition to external influences, deviations can also be caused by influ-
ences within the unit itself. For this reason, the accuracy should be
checked from time to time.
Procedure
–
A free measuring path of 20 m is required.
–
A transit measurement on firm ground must be performed over both
X and Y axes (four measurements).
–
Place the unit in the horizontal position on a solid, level base and
switch on.
–
After levelling, mark the laser point (centre of the point) at a convenient
position, for example, on a wall.
–
Then rotate the unit by approx. 90° without lifting it, i.e., without
changing its height.
–
Now turn back the prism cap 1, realign with the bubble levels and
mark again. Repeat this procedure in two additional 90° steps. The
heights of all four measurements are now marked at the same posi-
tion on the wall.
The maximum deviation at 20 m must not exceed ±6 mm. Consequently,
the highest and lowest markings can be 12 mm apart. This deviation re-
sults from tolerances of the unit and application when checking the accu-
racy.
Should the unit be outside of these tolerances, please contact a Bosch
Service Centre.
1 609 929 C25 • (01.07) T
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