FIELD: nondestructive testing of articles, determination of surface defects. SUBSTANCE: salient feature of invention lies in joint synchronous usage of assemblage of memory segments, multiple unit of converters that includes individual defect sensors, averagers, threshold strip and indicator. Synchronous operation of flaw detector is maintained by series-parallel control unit fitted with counters connected in accordance with double-stage circuit. EFFECT: simplified technology of uninterrupted control over lot of articles of same type. 2 cl, 2 dwg
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