A check for forbidden or unusual graphics elements is carried out in order to inspect printed-circuit board layouts which are designed by means of an interactive CAD system, from purely graphical viewpoints. For this purpose, the inspection device has a memory with a list of the forbidden or unusual graphics elements, so that defects can be detected by comparison with the designed printed-circuit-board layout on the basis of criteria which are of a purely graphic nature. The memory is equipped in the manner of a library in which different widths, which can be identified mathematically but are invisible in the optical result, are allocated to the conductor tracks depending on the potential of the power supply of the respective conductor track. Furthermore, criteria which are defined in a component data file are stored (for example all the pins of a discrete component must be connected). The novel device allows defects to be identified which affect the correctness of connections which can be graphically identified.
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