This publication also bears a QC number. This number, QC 250200 is the specification number in the IEC Quality Assessment System for Electronic Components (IECQ). Lists the characteristics, ratings and also the inspection requirements for magnetic oxide cores of assessed quality forming a substantially closed magnetic circuit intended for broadband transformers for professional and industrial applications, excluding power and tuned transformers. Defines the appropriate methods of test to be used in detail specifications derived from this specification, in accordance with the corresponding blank detail specification.