The JJG117-91 flat panel verification procedure stipulates that when determining the flatness error value, it is necessary to consider the degree of coincidence of the repeating verification point flatness. This is of great significance for finding the gross error of the verification data, correctly judging the reliability of the verification result, and improving the quality of the plate verification. In the current actual verification work, some conceptually incorrect understanding and wrong practices hinder the implementation of the verification procedures, so it is necessary to emphasize the correct calculation of the degree of coincidence and flatness.
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