This part of IEC 244 contains the method of measurement to assess the performance characteristics of television transposers. To assess all other characteristics, this standard .is to be used in conjunction with the publications quoted in clause 2 .This standard is intended to be used for type tests and acceptance or factory tests It is not mandatory to measure all the described characteristics. Additional measurements .may be carried out by agreement between customer and manufacturer The performance characteristics measured in accordance with this standard makes .possible the comparison of the results of measurements made by different observers Limiting values for acceptable performance are not covered by this standard but, in connection with the presentation of measured characteristics, some data are given for .clarity