tailieunhanh - Measurement Process Characterization_12

Tham khảo tài liệu 'measurement process characterization_12', kỹ thuật - công nghệ, điện - điện tử phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | . Uncertainty analysis standard 3. Sensitivity coefficients for measurements with a 2-level design 4. Sensitivity coefficients for measurements with a 3-level design 5. Example of error budget 7. Standard and expanded uncertainties 1. Degrees of freedom 8. Treatment of uncorrected bias 1. Computation of revised uncertainty NIST SEMATECH HOME tools AIDS SEARCH BACK NEXT http div898 handbook mpc section5 2 of 2 5 1 2006 10 12 45 AM . Issues ENGINEERING STATISTICS HANDBOOK hW tools raids lỉEÂtCH BACK Nixf 2. Measurement Process Characterization . Uncertainty analysis . Issues Issues for uncertainty analysis Evaluation of uncertainty is an ongoing process that can consume time and resources. It can also require the services of someone who is familiar with data analysis techniques particularly statistical analysis. Therefore it is important for laboratory personnel who are approaching uncertainty analysis for the first time to be aware of the resources required and to carefully lay out a plan for data collection and analysis. Problem areas Some laboratories such as test laboratories may not have the resources to undertake detailed uncertainty analyses even though increasingly quality management standards such as the ISO 9000 series are requiring that all measurement results be accompanied by statements of uncertainty. Other situations where uncertainty analyses are problematical are One-of-a-kind measurements Dynamic measurements that depend strongly on the application for the measurement Directions being pursued What can be done in these situations There is no definitive answer at this time. Several organizations such as the National Conference of Standards Laboratories NCSL and the International Standards Organization ISO are investigating methods for dealing with this problem and there is a document in draft that will recommend a simplified approach to uncertainty analysis based on results of interlaboratory tests. http .