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Dimensional Tolerances

The importance of this test rests on the fact that the dimensions of the fabricated modules must be within some tolerances (vertex coordinates: , neighbor side angles: , and opposite side angles: ) of theoretical dimensions --- these dimensions are given in the tables and figures of section 5.4 --- to successfully put together the calorimeter. Therefore, the dimensions of the delivered crystals are examined using a 3-dimensional measuring device. The device is computer controlled and automatically scans the surfaces, picking six points on each of the surfaces of the crystal whose dimensions are being checked. The selected points are fitted with planes, and the coordinates of the vertices follow as intersections of planes. The absolute precision of the device is with a reproducibility of .

Bernward Krause
Mon Jan 15 14:57:06 MET 1996