Quadrilateral diagonal isometric precision test of UV flatbed printer:print a rectangle frame by UV flatbed printer within its biggest print format, after printing with a ruler to measure whether the length of the diagonal is the same. According to the quadrilateral diagonal rule, if the diagonal length is equal, then this is a standard rectangle; if not equal length, it means that it is not a rectangle, it is diamond or trapezoid. If the printing frame is not unequal, that is to say it is out of shape seriously ,does not reach the requirements of qualified printing precision.
