This part of IEC 1237 describes the mechanical measurement methods on video tape recorders relating to the compatibility parameters for recording and measuring methods of the recorded tape. The allowable tolerances for the rated values for acceptable performance are not given in this standard, but may be derived from the specifications for the related system i.e. appropriate publications, manufacturers' specifications, etc. The necessary reference and calibration tapes are either mentioned in the specific IEC publication of the equipment under test or included in IEC 1105. This standard deals with special mechanical measurement techniques for broadcast VTRs. It does not, however, cover the special mechanical measurements of the earlier transverse track video recorder standard (IEC 347). For those measurements see IEC 1055. The methods are applicable to acceptance tests, performance comparison and, as far as possible, for routine checks.