HEDÜ NA24 Mode D'emploi page 3

4. Checking the Compensator
Be sure to check the reliability of the compensator. Take a look through the
eyepiece. Through a lightly push at the tripod, you should be able to see a
swinging of the compensator. If the compensator does not swing, the
automatic horizonting is out of order. After the check the level must be re-
adjusted.
5. Calibration
All automatic levels have been calibrated at the factory. To secure the
accuracy, you should check whether the level needs a re-calibration or not.
5.1 Check of circular bubble
Center the bubble and turn the stereoscope to an angle of 180°. The bubble
should be centered (see picture D). The bubble needs adjusting if it is
uncentered.
D
5.2 Adjust circular bubble
Adjust the levelling screws to move the bubble to half of its displacement
form the center (see picture E).
E
Center
Displaced bubble
Move to the position shown by the dotted line.
(Half of the displacement)
03