I.S. EN 61672-1:2013

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Reference environmental conditions
5 Performance specifications
6 Environmental, electrostatic, and radio-frequency
  requirements
7 Provision for use with auxiliary devices
8 Marking
9 Instruction Manual
Annex A (informative) - Relationship between tolerance
        interval, corresponding acceptance interval and
        the maximum-permitted uncertainty of
        measurement
Annex B (normative) - Maximum-permitted uncertainties
        of measurement
Annex C (informative) - Example assessments of
        conformance to specifications of this
        standard
Annex D (normative) - Frequencies at fractional-octave
        intervals
Annex E (normative) - Analytical expressions for
        frequency-weightings C, A, and Z
Annex ZA (normative) - Normative references to
         international publications with their
         corresponding European publications

Provides electroacoustical performance specifications for three kinds of sound measuring instruments: - time-weighting sound level meters that measure exponential-time-weighted, frequency-weighted sound levels; - integrating-averaging sound level meters that measure time-averaged, frequency-weighted sound levels; and - integrating sound level meters that measure sure frequency-weighted sound exposure levels.