This standard lists the ratings, characteristics, inspection requirements and additional information for radio interference suppression filters of the stated assessment level which are to be included as minimum mandatory requirements in the detail specification, together with supplementary tests which may be called up at the discretion of the specification writer to meet particular circumstances. It is a blank detail specification for radio interference suppression filters relating to BS 9120:1988 “Specification for radio interference suppression filters of assessed quality: generic data and methods of test??, in the BS 9000 series.