本规程描述了一种测试胶片，其使用仅限于测定35mm电影音频复制机中扫描光束照明的均匀性。本测试胶片不用于确定扫描光束相对于胶片参考边缘的正确位置。

This practice describes a test film, the use of which is limited to the determination of the uniformity of scanning-beam illumination in 35-mm motion-picture audio reproducers.This test film is not intended to be used for the determination of the correct position of the scanning beam with respect to the reference edge of the film.