A COMPARATOR CALIBRATION METHOD
ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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A method is described for calibrating precision comparators by using grid plates which have been calibrated by means of a triangulation method based exclusively on distance measurements. The method used for calibrating the grid plate provides measurements of the x, y coordinates for selected grid intersections to an accuracy better than plus or minus 1 micron. Using calibrated grid plates, the comparator may be calibrated to determine instrument constants such as 1 Overall scalers of the measuring screws. 2 Non- orthogonality between the x and y movements. 3 Translation and rotation between grid and comparator coordinate systems. The results of a number of calibrations are shown.
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