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This standard specifies the performance requirements for three levels of acoustic calibrators: laboratory standard (LS level)、 level 1 and level 2. The tolerance limit for LS level is * small、 while the tolerance limit for level 2 is * large. LS level sound calibrators are generally only used in the laboratory、 while Level 1 and Level 2 sound calibrators are used on-site. The Level 1 sound calibrator is mainly used in conjunction with the Level 1 sound level meter specified in IEC61672.1. The Level 2 sound calibrator is mainly used in conjunction with the Level 2 sound level meter. The tolerance limit for LS level sound calibrators that meet the requirements of this standard is based on the use of laboratory standard microphones that comply with IEC 61094-1. The tolerance limit for Level 1 and Level 2 sound calibrators that meet the requirements of this standard is based on the use of sound calibrators that comply with GB/T 20441 4 specified working standard microphones. A sound calibrator with multiple sound pressure levels and frequencies. All sound pressure levels and class rate combinations have the same level identification、 and it is specified in the user manual that the instrument meets the requirements of this standard. This standard does not include requirements for equivalent free field sound pressure levels or random human radiation sound pressure levels、 which can be used for adjusting the total sensitivity of sound level meters. The sound calibrator may have other functions、 such as burst sound、 and this standard does not include requirements for these other functions. 2 Normative References: The clauses in the following documents become the clauses of this standard through reference to technical standards. All dated references、 subsequent amendments (excluding corrected content)、 or revisions are not applicable to this standard. However、 parties to agreements based on this standard are encouraged to investigate whether new versions of these documents can be used. For all undated reference documents、 the new version of * applies to this part. GB/T 3785 1-2010 Electroacoustic Sound Level Meters - Part 1: Specifications (IEC 61672-1:2002、 IDT) GB/T 3240-1982 Common Frequencies in Acoustic Measurements (idt ISO 266:1975) GB 9254-2008 Radio Disturbance Limits and Measurement Methods for Information Technology Equipment (CISPR 22:2006、 IDT) GB/T 17626 2-2006 Electromagnetic Compatibility Testing and Measurement Techniques - Electrostatic Discharge Immunity Test (IEC 61000-4-2:2001. IDT GB/T 1799) 1-1999 Electromagnetic Compatibility General Standard for Residential、 Commercial、 and Unidentified Results (idu1EC 61000-6-1: 1997) GB/T 1799.3-2001 Electromagnetic Compatibility General Standard for Emissions in Residential、 Commercial、 and Light Industrial Environments (idtCISPR/IEC 61000-6-3; 1996) GB/T 20441.4-2006 Measurement Microphones Part 4: Specification for Operating Standard Microphones (IEC 61094-4:1995. IDT) ISO/IEC Guide: 1995、 Guidelines for the Expression of Measurement Uncertainty (GUM) ISO Announcement: 1993 ISBN 92-67-01075-1 International Basic Vocabulary and General Terminology of Metrology IEC 61094-1:2000 Measurement Microphones Part 1; Specification for laboratory standard microphones IEC61094-2:1992 Measurement microphones Part 2: Primary method for calibration of laboratory standard microphones using reciprocity search IEC61094-52001 Measurement microphones Part 5: Comparison method for calibration of working standard microphones IEC 60050 (801); 1994 International Electrotechnical Vocabulary (IEV) Chapter 801: Acoustics and electroacoustics IEC 61000-4-3:2002 Electromagnetic compatibility (EMC) Part 4-3: Testing and measurement techniques - Radio frequency electromagnetic field immunity test. Basic EMC Bulletin OIML. International Recommendation R97:1990 Barometer
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