Standards Development

Scope

This part of IEC 61000 provides methods and background information for the evaluation of measurement uncertainty in EMC tests and calibrations. It gives guidance to cover general measurement uncertainty considerations within the IEC 61000 series.

The objectives of this Technical Specification are to give advice to EMC technical committees dealing with EMC tests, testing laboratories and calibration laboratories on the development o f measurement uncertainty budgets; to allow uniform development and comparability of these budgets between laboratories; and to align the treatment of measurement uncertainty across the technical committees of the IEC dealing with EMC tests.

Any contributing factor to measurement uncertainty that is mentioned within this Technical Specification shall be treated as an example: the EMC committee responsible for the preparation of a basic immunity or emission standard is responsible for identifying the factors that contribute to the measurement uncertainty of the relevant test method.

This Technical Specification provides

– methods for the evaluation of measurement uncertainty (MU),

– mathematical formulas for probability density functions and their interpretation,

– examples of MU calculations,

– examples of MU applications,

– MU reporting information.

This Technical Specification is not intended to summarize all measurement uncertainty influence quantities, nor is it intended to specify how measurement uncert ainty is to be taken into account in determining compliance with an EMC requirement.

NOTE Some of the examples given in this specification are based on IEC publications other than the IEC 61000 series that have already implemented the evaluation procedure presented here. These examples are used to illustrate the principles.

Purpose

Uncertainty evaluation is essential for conformity assessment when based on results of measurements. Electromagnetic Compatibility (EMC) testing laboratories need guidance on uncertainty evaluation both in case of emission and immunity testing. The technical commi ttees of the IEC dealing with EMC tests should evaluate repeatability and reproducibility of the test and calibration methods under their responsibility for validation purpose and provide information to the users of the standards on the relevant uncertaint y budgets. This document sets principles and methods that should be adhered to for a uniform evaluation and interpretation of uncertainty across the wide variety of test and calibration methods developed and maintained by the technical committees of the IEC dealing with EMC tests.