EN ISO 14956:2002

Foreword
Introduction
1 Scope
2 Normative reference
3 Terms and definitions
4 Symbols and abbreviated terms
5 Principle
6 Requirements
   6.1 Methods and materials
   6.2 Performance characteristics
   6.3 Required measurement quality
7 Required performance related to dynamic conditions
   7.1 General
   7.2 Response time
8 Required performance related to stationary conditions
   8.1 Analytical function, model function and variance
       function
   8.2 Identification of sources of uncertainty
   8.3 Assignment of sources of uncertainty to performance
       characteristics
   8.4 Definition and quantification of conditions of operation
       of the measurement system
   8.5 Quantification of the impact of selected performance
       characteristics as partial standard uncertainties
   8.6 Estimation of the combined standard uncertainty
   8.7 Estimation of the expanded uncertainty
   8.8 Evaluation of compliance with the required measurement
       quality
9 Field verification
10 Report
Annex A (informative) Default ranges of chemical interferents
Annex B (normative) Coverage factors derived from effective
        degrees of freedom
Annex C (informative) Example of an assessment of compliance
        of UV fluorescence method for SO[2] with requirements
        on ambient air quality
Annex D (informative) Examples of field verification programmes
Bibliography

This International Standard specifies, for the field of air quality measurement procedures, the: estimation of measurement uncertainty from actual or claimed values of all important performance characteristics of a method under stationary conditions; assessment of whether or not specified values for these performance characteristics comply with the required quality of a measured value at a stated measurand value; evaluation of the applicability of the measurement method based on laboratory performance and confirmatory field test; establishment of requirements on dynamic behaviour of instruments.This International Standard is applicable to measurement procedures whose output is a defined time average.