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JEITA Test Chart VIII(8)(Ball Chart)
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)
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