This part of IEC 1237 describes the test signals and measuring methods for equipments mainly dedicated to record/playback analogue composite TV-signals on magnetic tape on reels or in cassettes. 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 equipment under test or included in IEC 1105 (reference tapes) and IEC 1295 (calibration tapes). The principal object of this standard is to describe the methods of measurement, test signals and procedures which may apply to characteristics of video recording/playback machines mainly intended for professional use. The measuring methods described hereafter do not directly concern home equipment and it would appear that some will be difficult to apply to them.