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5.3.3.1 Zero-Point-Search
During the zero-point search the reletive zero points of the force measurment and the path measurment
get sincronized. Herefore the load cell gets moved with a predefined speed till the adjacent force value
exceeds 0,5 % of the par value of the load cell. After this the load cell gets driven back to the force-zero-
point with a predefined speed and the path measurment gets tared. The driving speeds get setted
automatically and depend on the load cell in use and the hardnessgrade of the material.
5.3.3.2 Breakdetection
During destructive inspection processes the fall of force after breaking or jerking of the material gets
recorded, the movement stoped and the force gauge gets driven back into the home position. The
breakdetection gets activated when the actual force F exceeds the adjusted %-value, refered to the
nominal range of measurment of the inserted range of force measurment. After that the load cell drives
on with the speed V<Break> and thereby the maximal force value gets averaged out continously. Does
the current force value fall down to a preregulated %-set of the maximal forcevalue, the ride gets stoped
and the linear drive brings the load cell back into the home-position.
5.3.3.3 Force regulation
During the forceregulation a predefined force gets kept for kept for a predefined amount of time. The
drive re-enacts automatically the position of the load cell, provided that the material property demands
this. The basic and the driving speed depends of the regulated hardnessgrade of the material. Is the
hardnessgrade understated it can lead to a consequently overshooting of the regulation. Is the
hardnessgrade overstated, the defined value of force will not be achieved within an appropriate amount
of time.
5.3.3.4 Path regulation
During the path regulation a path, predefined within the inspection proceses, does not refer to the
linearantrieb but to the compensated positionof the lead. The position of the slide gets corected until
the predefined way on the measuring object is achieved.
5.3.3.6 Hardnessgrade
As the universal test stand can be used both for very hard and prim materials and for soft or elastic
material, for the optimal force/path regulation the hardnessgrade of the material has to be established.
rials vorgegeben werden. In dependence of the load cell in use, the hardnessgrade defines the
travelling speed during the 0-point search and the force regulation.
Attention! Is the hardnessgrade regulated too low, it can lead to unwished early distruction while using
a refractory material or to an overshooting of the regulation while using a flexible and elastical material.
Hardnessgrade
0...99 0 stands fo a very soft material,
and 99 for a very hard, refractory material.
