美国无线电公司（RCA）提议的三个参数，有效振幅响应、不对称假设和MTF指数来定义的分辨率，以测量电视摄像管的分辨率光圈的形状。
这张图卡由倾斜的条纹找到MTF指数'K'和坡度干涉条纹发现光圈的分辨率。
倾斜条纹找出的MTF索引“K”相当于28到1500TV MTF。
此外，使用倾斜条纹测量出的分辨率光圈相当于28到1500TV的相对于扫描线方向上的±45度，±67.5度和90度倾斜角。
Radio Corporation of America(RCA) proposed to define resolution by three parameters, effective amplitude response, asymmetry postulate and MTF index, with measuring the shape of resolution aperture of pick up tube.
This Chart consists of sloped fringes to find MTF index ‘K’ and sloped fringes to find resolution aperture.
The sloped fringes to find MTF index ‘K’ are equivalent to fringes of 28 to 1500TV MTF.
Also, the sloped fringes to find resolution aperture are equivalent to fringes of 28 to 1500TV inclined at ±22.5 degrees, ±45degrees, ±67.5degrees and 90degrees with respect to scan line direction.
