如何使用

該測試卡用來檢測書的可讀性、細度和波形畸變。字母有各種尺寸，從800封/滿屏到80000信/滿屏顯示。在線路板的最上部的字母適用于檢查是否有拖影或條紋。此外，可以通過觀察五顏六色的字母來確定亮度信號的相位偏移情況。

How to use

The image is useful to check readability of letters, fineness and waveform distortion. 

There are various sizes of letters, from 800letters/1screenful to 80,000letters/1screenful. The letters in uppermost part of the board are suitable for checking if there is smear or streaking. Also if you focus on colorful letters, you can find conditions of phase shifting of brightness signal.