本规程确定了以15 in/s和7.5 in/s（381 mm/s和190.5 mm/s）速度运行的2英寸（51 mm）四路磁带录像机的输入和输出导轨之间磁带路径中关键元件的相对位置。

This practice establishes the relative locations of critical elements in the path of the tape between the input and output guides for 2-in (51-mm) quadruplex video magnetic tape recorders operating at 15 in/s and 7.5 in/s (381 mm/s and 190.5 mm/s).