Accuracy Check Of The Measuring Tool - CST/BERGER AL Serie Manual Original

Working without Automatic Levelling ("OFF")
When the automatic levelling is switched off, the lev-
elling of the axes is no longer monitored; the shock-
warning function is also switched off.
Position changes of the measuring tool are
not detected when the automatic levelling is
switched off.
As soon as a grade is set for an axis in horizontal posi-
tion, the automatic levelling is automatically switched
off regardless of the selected setting.
When the automatic levelling is switched off, the
measuring tool can be set up in any inclined position.
With the gradient plate (accessory), the measuring
tool can also be exactly inclined alongside an axis at
an angle larger than 10 % when in the horizontal posi-
tion.
Grade Setting in the Horizontal
Position
When the measuring tool is in the horizontal position,
grades to ± 10 % can be exactly set for both axes inde-
pendent from each other.
After switching on in the hori-
zontal position, the menu for
grade adjustment appears on
the display. To call up the
grade menu again, e.g. after changing the operating
mode, press the function-mode button 7 until
"SELECT/GRADE" is indicated on the display. Then
press the left selection button 8.
By briefly pressing the function-mode button 7, you
can select the axis for which the grade is to be set.
The selected axis is marked with ">". Set the desired
grade value with selection button 8 above "+" or
selection button 4 above " – ". To exit the grade menu,
press function-mode button 7 for 5 seconds.
The grade setting is stored when switching off the
measuring tool. To horizontally align the rotational
plane, set both grade values to 0.00 %.
The maximal grade of 10 % can only be reached when
the measuring tool is exactly horizontal. When
inclined, the maximal grade angle is reduced by the
inclined angle. When the set grade angle cannot be
reached, "ERROR/GD TOO STEEP" is indicated on
the display.
In this case, switch the measuring tool off, re-align it
and switch the measuring tool on again. If the measur-
ing tool is not re-positioned, it is automatically
switched off after 2 minutes.
26 | English
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To achieve the greatest possible accuracy for grading
work, the following points must be observed:
– Set up the measuring tool as level as possible
– The automatic levelling is switched off automati-
– When only one axis is inclined, the shock-warning
– When both axes are inclined, the shock-warning
– After position changes of the measuring tool when
Grades in only one axis should be set at the Y-axis, as
the measuring tool can be easier aligned with the
alignment aids 12 alongside this axis.

Accuracy Check of the Measuring Tool

Influences on Accuracy
The ambient temperature has the greatest influence.
Especially temperature differences occurring from the
ground upward can divert the laser beam.
The deviations play a role in excess of approx. 20 m
measuring distance and can easily reach two to four
times the deviation at 100 m.
Because the largest difference in temperature layers
is close to the ground, the measuring tool should
always be mounted on a tripod when measuring dis-
tances exceeding 20 m. If possible, also set up the
measuring tool in the centre of the work area.
Apart from exterior influences, device-specific influ-
ences (such as heavy impact or falling down) can lead
to deviations. Therefore, check the accuracy of the
measuring tool each time before starting your work.
To check the accuracy, select rotational operation
and, if required, use the laser receiver to mark the cen-
tre of the rotating laser beam.
Should the measuring tool exceed the maximum devi-
ation during one of the tests, please have it repaired
by a Bosch after-sales service.
before switching on or setting a grade.
cally when the axes are inclined.
function for the second axis can be switched on.
The shock-warning function is deactivated for
approx. 30 seconds each time after changing the
grade value. When the shock-warning function is
actuated from position changes, the rotational plane
is exactly inclined again according to the stored
value after the levelling.
function is automatically deactivated. Position
changes of the measuring tool are not detected.
both axes are inclined or when the shock-warning
function is shut off, switch the measuring tool off
and then on again. After switching on, the rota-
tional plane firstly levels out horizontal before
being exactly inclined with the stored values.
2 610 A15 112 • 12.8.09