TAILIEUCHUNG - Measurement Process Characterization_9

Tham khảo tài liệu 'measurement process characterization_9', kỹ thuật - công nghệ, điện - điện tử phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | . Example of EWMA control chart for mass calibrations let upper mean 3 fudge s let lower mean - 3 fudge s let nm1 n-1 let start 106 let pred2 mean loop for i start 1 nm1 let ip1 i 1 let yi y i let predi pred2 i let predip1 lambda yi 1-lambda predi let pred2 ip1 predip1 end loop char blank circle blank blank char size 2 2 2 1 2 2 char fill on all lines blank dotted blank solid solid solid plot y mean versus x and plot y pred2 lower upper versus x subset x cutoff Interpretation of the control chart The EWMA control chart shows many violations of the control limits starting at approximately the mid-point of 1986. This pattern emerges because the process average has actually shifted about one standard deviation and the EWMA control chart is sensitive to small changes. NIST SEMATECH HOME rtOOLSÌAIDS rSÉARCH I ACK NÍXĨ http div898 handbook mpc section3 3 of 3 5 1 2006 10 12 22 AM . Instrument calibration over a regime ENGINEERING STATISTICS HANDBOOK HOME TOOLS AIDS SEARCH BACK next 2. Measurement Process Characterization . Calibration . Instrument calibration over a regime Topics This section discusses the creation of a calibration curve for calibrating instruments gauges whose responses cover a large range. Topics are A Models for instrument calibration A Data collection A Assumptions A Conditions that can invalidate the calibration procedure A Data analysis and model validation A Calibration of future measurements A Uncertainties of calibrated values Purpose of instrument calibration Instrument calibration is intended to eliminate or reduce bias in an instrument s readings over a range for all continuous values. For this purpose reference standards with known values for selected points covering the range of interest are measured with the instrument in question. Then a functional relationship is established between the values of the standards and the corresponding measurements. There are two basic situations. .

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