Specifications

LASER D22, D23: calibrating the vials
A9
Here we describe how you calibrate the vials
on the D22 and D23. This is normally done at
delivery, but can be redone when necessary. The
vials are scaled to 0.02 mm/m [4 arc sec.].
Accurate levelling to the vials will achieve a
repeated levelling better than the scaling of the
vials, approximately 0.005 mm/m [1 arc sec.].
If the laser is to be used as a levelled reference
the vials must be calibrated to the laser beam.
That means that the vials are calibrated to the
laser beam, and not to the bottom of the laser
transmitter. Principle:
Let the laser beam pass through two fixed points,
at least 1 meter apart. Turn the laser transmitter
180° and tilt the beam to pass through the two
points again. Adjust the vials to half the travel.
One of the fixed points is the laser transmitter,
because the beam aperture is at the same height
the whole turn around. The other fixed point is a
detector with fixed position of the laser beam.
Use the progam Values during calibration. Long distance
to detector will get you a better result (at least 1 m). Turn
the laser 180° with the laser head at the centre and aim
the beam backwards within 1 mm in side direction (H-value).
A. Level according to vials.
B. Zero set on the display unit (press ).
C. Turn laser 180°.
C. Level according to vials.
D. Halve the displayed value (press ).
E. Level the V-value to zero.
F. Adjust the vial using a hexagon wrench.
G. Turn laser transmitter 90°.
G. Level the V-value to zero.
F. Adjust the second vial using a hexagon wrench.
Vials
A