16 mm磁性音频复制机用U型音频电平和多频测试胶片规范本规程规定了一种U型音频测试胶片，用于调整以每秒24帧的速度运行的16 mm电影磁性音频复制机的机械和电气参数。

Specifications for Type U Audio Level and Multifrequency Test Film for 16-mm Audio Reproducers, Magnetic Type This practice specifies a type U audio frequency test film to be used for adjusting the mechanical and electrical parameters of 16-mm motion-picture magnetic audio reproducers operating at 24 frames per second.