JEITA Test Chart VIII(8)(Ball Chart)
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The size of the circles and the distance between the balls are stated as follows:
(1)Outer circle of the rings :Radius 2/100h(2%)
(2)Inner circle of the rings :Radius 1/100h(1%)
(3)The distance between the balls:
Horizontal direction 315KHz(approx. 2/25h)
Vertical direction 900Hz (approx. 1/14h)