Uncertainty analysis: quality control and test facility certification

Uncertainty analysis: quality control and test facility certification

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This chapter is concerned with the EMC testing. The repeatability of EMC testing depends on many factors that affect the measurement result. Some factors are not well understood or not documented in terms of the nature and magnitude of their contributions to the total uncertainty. The treatment of measurement uncertainty involves the use of statistics to estimate the probable uncertainty and associated confidence level with regard to a particular measurement or set of measurements. Statistics and probability theory is a considerable subject in its own right and far too large to deal with adequately in a book such as this, which is primarily concerned with the varied aspects of EMC testing.

Chapter Contents:

  • 11.1 Introduction
  • 11.2 Some definitions
  • 11.3 Measurement factors
  • 11.4 Random variables
  • 11.4.1 Student's t-distribution
  • 11.5 Systematic uncertainty
  • 11.6 Combining random and systematic uncertainties
  • 11.7 Uncertainties in EMC measurements
  • 11.7.1 Contributions to measurement uncertainty
  • 11.7.2 Identification of uncertainty factors
  • 11.7.3 Estimation of uncertainty values
  • 11.7.4 Estimate of total uncertainty
  • 11.8 Test laboratory measurement uncertainty
  • 11.8.1 NAMAS
  • 11.8.2 NAMAS and measurement uncertainty
  • 11.8.3 Limits and production testing
  • 11.9 NAMAS requirements for laboratory accreditation
  • 11.9.1 Requirements for accreditation
  • 11.9.2 Advantages if laboratory accreditation
  • 11.10 References

Inspec keywords: quality control; electromagnetic compatibility; measurement uncertainty

Other keywords: EMC testing; test facility certification; quality control; uncertainty analysis; probability theory; measurement uncertainty

Subjects: Electromagnetic compatibility and interference

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