IEC 60942-2003 pdf – Electroacoustics – Sound calibrators

IEC 60942-2003 pdf – Electroacoustics – Sound calibrators.
1 Scope This International Standard 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. A multi-level and multi-frequency sound calibrator has the same class designation for all sound pressure level and frequency combinations for which the instruction manual states that the instrument conforms to the requirements of this standard. This standard does not include requirements for equivalent free-field or random-incidence sound pressure levels, such as may be used in the overall sensitivity adjustment of a sound level meter. A sound calibrator may provide other functions, for example, tonebursts. Requirements for these other functions are not included in this standard.
2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60050(801):1994, International Electrotechnical Vocabulary (IEV) – Chapter 801: Acoustics and electroacoustics IEC 61000-4-2:1995, Electromagnetic compatibility (EMC) – Part 4: Testing and measurement techniques – Section 2: Electrostatic discharge immunity test. Basic EMC Publication IEC 61000-4-3:2002, Electromagnetic compatibility (EMC) – Part 4-3: Testing and measure- ment techniques – Radiated, radio-frequency, electromagnetic field immunity test. Basic EMC Publication
IEC 61000-6-1:1997, Electromagnetic compatibility (EMC) – Part 6: Generic standards – Section 1: Immunity for residential, commercial and light-industrial environments IEC 61094-1:2000, Measurement microphones – Part 1: Specifications for laboratory standard microphones IEC 61094-2:1992, Measurement microphones – Part 2: Primary method for pressure calibration of laboratory standard microphones by the reciprocity technique IEC 61094-4:1995, Measurement microphones – Part 4: Specifications for working standard microphones IEC 61094-5:2001, Measurement microphones – Part 5: Methods for pressure calibration of working standard microphones by comparison IEC 61672-1:2002, Electroacoustics – Sound level meters – Part 1: Specifications CISPR 22:1997, Information technology equipment – Radio disturbance characteristics – Limits and methods of measurement CISPR/IEC 61000-6-3:1996, Electromagnetic compatibility (EMC) – Part 6: Generic standards – Section 3: Emission standard for residential, commercial and light-industrial environments ISO/IEC Guide :1995, Guide to the expression of uncertainty in measurement ISO 266:1997, Acoustics – Preferred frequencies ISO Publication:1993, ISBN 92-67-01075-1, International vocabulary of basic and general terms in metrology OIML International Recommendation R 97:1990, Barometers 3 Terms and definitions For the purposes of this International Standard, the definitions contained in IEC 60050(801) and the ISO Publication International Vocabulary of Basic and General Terms in Metrology, as well as the following definitions, apply. Definitions for other relevant quantities are given in the documents referenced in Clause 2. 3.1 sound calibrator device that generates a sinusoidal sound pressure of specified sound pressure level and frequency when coupled to specified models of microphone in specified configurations
5 Prescriptions 5.1 Généralités 5.1.1 Un calibreur acoustique satisfaisant aux prescriptions de la présente norme doit présenter les caractéristiques décrites dans le présent article. On peut avoir recours à des adaptateurs de façon à permettre le couplage avec plusieurs modèles de microphones. Dans le cadre de la présente norme, un tel adaptateur fait partie intégrante du calibreur acoustique. 5.1.2 Le calibreur acoustique doit être conforme aux prescriptions de la présente norme pour une ou plusieurs combinaisons de niveau de pression acoustique et de fréquence possibles. Toutes les combinaisons se conformant aux prescriptions données dans la présente norme doivent se conformer à la même classe. La conformité aux prescriptions de la présente norme ne doit pas être spécifiée pour des niveaux de pression acoustique et pour des réglages de fréquence pour lesquels la présente norme ne fournit aucune limite de tolérance. 5.1.3 Les calibreurs acoustiques de classe LS doivent être fournis avec une feuille d’étalonnage individuelle contenant les renseignements prescrits en 6.2. Pour les calibreurs acoustiques de classe 1 et de classe 2, le ou les niveaux de pression acoustique ainsi que la ou les fréquences spécifiées doivent être donnés dans le manuel d’instruction.