ASA S3.1-1999
Maximum Permissible Ambient Noise Levels for Audiometric Test Rooms

Standard No.
ASA S3.1-1999
Release Date
1999
Published By
Acoustical Society of America (ASA)
Latest
ASA S3.1-1999
Scope
Hearing measurements in an audiometric test room may be conducted for different audiometric purposes over different test frequency ranges. However, if the ambient noise level is excessively high, some hearing threshold levels measured in that environment will be inaccurate. This occurs because excessively high ambient noise will create an elevation of hearing threshold levels. This is a psychoacoustic phenomenon called masking. Exclusion of all ambient noise from an audiometric test room is not feasible nor practical from structural and cost considerations. However, to ensure that hearing tests are not influenced by excessive ambient noise masking, there is a need to specify maximum permissible ambient noise levels (MPANLs) that can be allowed in an audiometric test room. This is true particularly when testing is done at sound pressure levels for pure tones corresponding to 0 dB hearing level. Further, there is a need to specify MPANLs for different audiometric conditions, test frequency ranges, and earphone types that will permit testing at reference equivalent threshold levels specified in ANSI S3.6- 1996 American National Standard Specification for Audiometers. This Standard includes the specification and measurement of MPANLs in an audiometric test room. Within this Standard, MPANLs are specified for octave and one-third octave band intervals from 125 to 8000 Hz for the audiometric conditions of testing with ears covered using a supra-aural and insert earphone and ears not covered for the test frequency ranges 125 to 8000 Hz, 250 to 8000 Hz, and 500 to 8000 Hz.

ASA S3.1-1999 history

  • 1999 ASA S3.1-1999 Maximum Permissible Ambient Noise Levels for Audiometric Test Rooms

ASA S3.1-1999 -All Parts

ASA S3.13-1987 Mechanical Coupler for Measurement of Bone Vibrators ASA S3.14-1977 Rating Noise with Respect to Speech Interference ASA 21-1977 R(1997) ASA S3.18 PART 4-2003 Mechanical Vibration and Shock - Evaluation of Human Exposure to Whole Body Vibration - Part 4: Guidelines for the Evaluation of the Effects of Vibration and Rotational Motion on Passenger and Crew Comfort in Fixed-Guideway Transport Systems ISO 2631-4:2 ASA S3.18-2002 Mechanical Vibration and ShockEvaluation of Human Exposure to Whole-Body VibrationPart 1: General Requirements ISO 2631-1:1997 [: ASA S2.72 PART 1] ASA S3.2-2020 AMERICAN NATIONAL STANDARD Method for Measuring the Intelligibility of Speech over Communication Systems ASA S3.20-2015(R2020) American National Standard for Bioacoustical Terminology ASA S3.21-2004 Methods for Manual Pure-Tone Threshold Audiometry ASA S3.22-2014(R2020) American National Standard Specification of Hearing Aid Characteristics ASA S3.25-2009 American National Standard For an Occluded Ear Simulator ASA S3.29-1983 Guide to the Evaluation of Human Exposure to Vibration in Buildings ASA 48-1983, Erratum 1998 R(2001) ASA S3.32-1982 Mechanical Vibration and Shock Affecting Man - Vocabulary ASA 43-1982 R(1999) ASA S3.34-1986 Guide for the Measurement and Evaluation of Human Exposure to Vibration Transmitted to the Hand ASA 67-1986 R(1997) ASA S3.35-2010 American National Standard Method of Measurement of Performance Characteristics of Hearing Aids Under Simulated Real-Ear Working Conditions ASA S3.35-2004-2004 Method of Measurement of Performance Characteristics of Hearing Aids Under Simulated Real-Ear Working Conditions ASA 59 ASA S3.36-1985 Specifications for Manikin for Simulated In- Situ Airborne Acoustic Measurements ASA S3.37-1987 Preferred Earhook Nozzle Thread for Postauricular Hearing Aids ASA S3.39-1987 Specifications for Instruments to Measure Aural Acoustic Impedance and Admittance (Aural Acoustic Immittance) ASA S3.4-2007(1) American National Standard Procedures for Testing Basic Vestibular Function ASA S3.40-2002 Mechanical Vibration and Shock Hand-Arm Vibration Method for the Measurement and Evaluation of the Vibration Transmissibility of Gloves at the Palm of the Hand ISO 10819:1996 ASA S3.41-2015(R2020) American National Standard for Audible Emergency Evacuation Signal (E2) and Evacuation Signals with Relocation Instructions (ESRI) ASA S3.42-1992 Testing Hearing Aids with a Broad-Band Noise Signal ASA S3.44 PART 1-2016 American National Standard Acoustics - Estimation of Noise‐induced Hearing Loss-Part 1: Method for Calculating Expected Noise‐induced Permanent Threshold Shift ( a modified nationally adopted international standard) ASA S3.44-1996 Determination of Occupational Noise Exposure and Estimation of Noise-Induced Hearing Impairment ASA S3.45-2009 American National Standard Procedures for Testing Basic Vestibular Function ASA S3.46-2013 American National Standard Methods of Measurement of Real-Ear Performance Characteristics of Hearing Aids ASA S3.47-2014 American National Standard Specification of Performance Measurement of Hearing Assistance Devices/Systems ASA S3.5-1997 Methods for Calculation of the Speech Intelligibility Index ASA S3.50-2013 American National Standard Method for Evaluation of the Intelligibility of Text-to-Speech Synthesis Systems ASA S3.52-2016(R2020) American National Standard for Measurements of the Threshold of Hearing and Signal Detectability in a Sound Field ASA S3.55 PART 1-2014 American National Standard Electroacoustics - Simulators of Human Head and Ear - Part 1: Ear Simulator for the Measurement of Supra-aural and Circumaural Earphones (a nationally adopted international standard) ASA S3.55 PART 5-2014 American National Standard Electroacoustics - Simulators of Human Head and Ear - Part 5: 2 cm3 Coupler for the Measurement of Hearing Aids and Earphones Coupled to the Ear by Means of Ear Inserts (a modified nationally adopted international standard) ASA S3.6-2018(R2023) American National Standard Specification for Audiometers ASA S3.7-2016(R2020) American National Standard Method for Measurement and Calibration of Earphones


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