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This document has been prepared by Working Committee NA 962-05-73 AA "Gasanalyse und Gasbeschaffenheit" ("Gas analysis and gas quality") at DIN Standards Committee Material Testing (NMP). This document specifies an absolute volumetric method for dynamic preparation of calibration gases from pure gases - consisting of two or more components - using commercially available gas mixing pumps with at least two piston pumps, driven with defined stroke rate ratios.