BS EN 60942:2003

INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Reference environmental conditions
5 Requirements
  5.1 General
  5.2 Sound pressure level
  5.3 Frequency
  5.4 Influence of static pressure, air temperature
      and humidity
  5.5 Total distortion
  5.6 Power supply requirements
  5.7 Specification and calibration of microphones
  5.8 Electromagnetic compatibility
6 Instrument marking and documentation
  6.1 Marking of the sound calibrator
  6.2 Individual calibration chart for a class LS
      sound calibrator
  6.3 Instruction manual
Annex A (normative) - Pattern evaluation tests
  A.0 Introduction
  A.1 Submission for test
  A.2 Principal values
  A.3 Marking of the sound calibrator and supplied
      documentation
  A.4 Performance tests at and around reference
      environmental conditions
  A.5 Environmental tests
  A.6 Electromagnetic compatibility
Annex B (normative) - Periodic tests
  B.0 Introduction
  B.1 Submission for test
  B.2 Preliminary inspection
  B.3 Performance tests
  B.4 Calibration of the sound calibrator with other
      models of microphone
  B.5 Documentation
Annex C (normative) - Format for the pattern
        evaluation report
  C.0 Introduction
  C.1 Marking
  C.2 Submission for test
  C.3 Pattern evaluation report
Annex ZA (normative) Normative references to international
         publications with their corresponding European
         publications
Bibliography

Defines performance requirements for three classes of sound calibrator - classes 0, 1 and 2 in decreasing order of accuracy under specific conditions.

Specifies the performance requirements for three classes of sound calibrator: laboratory standard (class LS), class 1 and class 2. Tolerance limits are smallest for class LS and greatest for class 2 instruments. Class LS sound calibrators are normally used only in the laboratory; class 1 and class 2 are considered as sound calibrators for field use. A class 1 sound calibrator is primarily intended for use with a class 1 sound level meter and a class 2 sound calibrator primarily with a class 2 sound level meter, as specified in IEC 61672-1. The tolerance limits for class LS sound calibrators are based on the use of a laboratory standard microphone, as specified in IEC 61094-1, for demonstrations of conformance to the requirements of this standard. The tolerance limits for class 1 and class 2 sound calibrators are based on the use of a working standard microphone, as specified in IEC 61094-4, for demonstrations of conformance to the requirements of this standard. This third edition cancels and replaces the second edition published in 1997, and its amendment 1 (2000), of which it constitutes a technical revision.