Verfahren zum Pruefen magnetischer Aufzeichnungstraeger auf Fehler in der magnetischen Schicht

摘要

A method and apparatus for characterizing defect levels and assigning valuations to these levels to enable the rejection of tapes containing defects exceeding predetermined levels, the apparatus including a series of resistant dividers which are weighted in determining the depth of a defect and a series of monostable multivibrators for determining duration, each of these factors having progressive values assigned thereto, a matrix responsive to combinations of depth and duration for determining the annoyance value of a defect, and an output for accumulating the annoyance levels.