美國無線電公司（RCA）提議的三個參數，有效振幅響應、不對稱假設和MTF指數來定義的分辨率，以測量電視攝像管的分辨率光圈的形狀。

這張圖卡由傾斜的條紋找到MTF指數'K'和坡度干涉條紋發現光圈的分辨率。
傾斜條紋找出的MTF索引“K”相當于28到1500TV MTF。
此外，使用傾斜條紋測量出的分辨率光圈相當于28到1500TV的相對于掃描線方向上的±45度，±67.5度和90度傾斜角。
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.