• IEC 60318-1:2009

    Current The latest, up-to-date edition.

    Electroacoustics - Simulators of human head and ear - Part 1: Ear simulator for the measurement of supra-aural and circumaural earphones

    Available format(s):  Hardcopy, PDF, PDF 3 Users, PDF 5 Users, PDF 9 Users

    Language(s):  English - French, Spanish, Castilian

    Published date:  31-08-2009

    Publisher:  International Electrotechnical Committee

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    Abstract - (Show below) - (Hide below)

    IEC 60318-1:2009 specifies an ear simulator for the measurement of supra-aural and circumaural earphones (used for example in audiometry and telephonometry) applied to the ear without acoustical leakage, in the frequency range from 20 Hz to 10 kHz. The same device can be used as an acoustic coupler at additional frequencies up to 16 kHz. This second edition cancels and replaces the first edition published in 1998 as well as replacing IEC 60318-2, published in 1998. It constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
    - an extension of the frequency range to 16 kHz;
    - a revised specification for the acoustical transfer impedance, including tolerances;
    - a method for measuring the acoustical transfer impedance;
    - expanded measurement uncertainties.

    General Product Information - (Show below) - (Hide below)

    Committee TC 29
    Development Note Supersedes IEC 60318. (03/2001) Supersedes IEC 60318-2. (09/2009) Also numbered as ANSI S3.55-1. (03/2014) Stability Date: 2018. (09/2017)
    Document Type Standard
    Publisher International Electrotechnical Committee
    Status Current
    Supersedes

    Standards Referenced By This Book - (Show below) - (Hide below)

    CSA Z107.56 : 2013:R2018 MEASUREMENT OF NOISE EXPOSURE
    DIN EN ISO 389-9:2009-12 Acoustics - Reference zero for the calibration of audiometric equipment - Part 9: Preferred test conditions for the determination of reference hearing threshold levels (ISO 389-9:2009)
    08/30176438 DC : DRAFT JAN 2008 BS EN 60645-1 - ELECTRO ACOUSTICS - AUDIOMETRIC EQUIPMENT - PART 1: PURE-TONE AUDIOMETERS
    17/30333265 DC : 0 BS EN ISO 389-1 - ACOUSTICS - REFERENCE ZERO FOR THE CALIBRATION OF AUDIOMETRIC EQUIPMENT - PART 1: REFERENCE EQUIVALENT THRESHOLD SOUND PRESSURE LEVELS FOR PURE TONES AND SUPRA-AURAL EARPHONES
    ANSI/ASA S3.20 : 2015 American National Standard Bioacoustical Terminology
    08/30189820 DC : DRAFT SEP 2008 BS EN ISO 8253-1 - ACOUSTICS - AUDIOMETRIC TEST METHODS - PART 1: BASIC PURE-TONE AIR AND BONE CONDUCTION THRESHOLD AUDIOMETRY
    BS EN 60268-7:2011 Sound system equipment Headphones and earphones
    14/30313972 DC : 0 BS EN 60645-1 ED.4.0 - ELECTROACOUSTICS - AUDIOMETRIC EQUIPMENT - PART 1: EQUIPMENT FOR PURE-TONE AND SPEECH AUDIOMETRY
    I.S. EN 61842:2002 MICROPHONES AND EARPHONES FOR SPEECH COMMUNICATIONS
    08/30185354 DC : DRAFT JULY 2008
    CEI EN 61842 : 2002 MICROPHONES AND EARPHONES FOR SPEECH COMMUNICATIONS
    BS EN 61842 : 2002 MICROPHONES AND EARPHONES FOR SPEECH COMMUNICATIONS
    04/30117001 DC : DRAFT JUL 2004 IEC 60645-3. ED.2.0 - AUDIOMETERS - PART 3: AUDITORY TEST SIGNALS OF SHORT DURATION FOR AUDIOMETRIC AND NEURO-OTOLOGICAL PURPOSES
    10/30217127 DC : 0 BS EN 60645-2 ED 2 - AUDIOMETRIC EQUIPMENT - PART 2: EQUIPMENT FOR SPEECH AUDIOMETRY
    CEI EN 60268-7 : 2012 SOUND SYSTEM EQUIPMENT - PART 7: HEADPHONES AND EARPHONES
    ANSI S3.6 : 2010 SPECIFICATION FOR AUDIOMETERS
    05/30133728 DC : DRAFT MAY 2005 EN 71-1 - SAFETY OF TOYS - PART 1: MECHANICAL AND PHYSICAL PROPERTIES
    NF EN 55024 : 2011 AMD 1 2015 INFORMATION TECHNOLOGY EQUIPMENT - IMMUNITY CHARACTERISTICS - LIMITS AND METHODS OF MEASUREMENT
    15/30287154 DC : 0 BS EN 60601-2-40 ED 2.0 - MEDICAL ELECTRICAL EQUIPMENT - PART 2-40: PARTICULAR REQUIREMENTS FOR BASIC SAFETY AND ESSENTIAL PERFORMANCE OF ELECTROMYOGRAPHS AND EVOKED RESPONSE EQUIPMENT - PROPOSED HORIZONTAL STANDARD
    BS PD6545(2005) : 2005 INTENDED USE OF HUMAN HEAD AND EAR SIMULATORS - GUIDE
    BS ISO TR 389-5 : 1998 AMD 12019 ACOUSTICS - REFERENCE ZERO FOR THE CALIBRATION OF AUDIOMETRIC EQUIPMENT - REFERENCE EQUIVALENT THRESHOLD SOUND PRESSURE LEVELS FOR PURE TONES IN THE FREQUENCY RANGE 9 KHZ TO 16 KHZ
    15/30328565 DC : 0 BS EN 60645-1 ED4.0 - ELECTROACOUSTICS - AUDIOMETRIC EQUIPMENT - PART 1: EQUIPMENT FOR PURE-TONE AND SPEECH AUDIOMETRY
    CEI EN 60268-16 : 2012 SOUND SYSTEM EQUIPMENT - PART 16: OBJECTIVE RATING OF SPEECH INTELLIGIBILITY BY SPEECH TRANSMISSION INDEX
    BS EN ISO 389-9:2009 Acoustics. Reference zero for the calibration of audiometric equipment Preferred test conditions for the determination of reference hearing threshold levels
    BS EN 60645-1:2017 Electroacoustics. Audiometric equipment Equipment for pure-tone and speech audiometry
    07/30166205 DC : 0 BS ISO 389-9 - ACOUSTICS - REFERENCE ZERO FOR THE CALIBRATION OF AUDIOMETRIC EQUIPMENT - PART 9: PREFERRED TEST CONDITIONS FOR THE DETERMINATION OF REFERENCE HEARING THRESHOLD LEVELS
    BS EN 60645-3 : 2007 ELECTROACOUSTICS - AUDIOMETRIC EQUIPMENT - PART 3: TEST SIGNALS OF SHORT DURATION
    BS EN ISO 389-1:2000 ACOUSTICS - REFERENCE ZERO FOR THE CALIBRATION OF AUDIOMETRIC EQUIPMENT - PART 1: REFERENCE EQUIVALENT THRESHOLD SOUND PRESSURE LEVELS FOR PURE TONES AND SUPRA-AURAL EARPHONES
    BS EN 60318-2 : 1998 ELECTROACOUSTICS - SIMULATORS OF HUMAN HEAD AND EAR - PART 2: AN INTERIM ACOUSTIC COUPLER FOR THE CALIBRATION OF AUDIOMETRIC EARPHONES IN THE EXTENDED HIGH-FREQUENCY RANGE
    07/30173584 DC : 0 BS EN 60645-7 - ELECTROACOUSTICS - AUDIOMETRIC EQUIPMENT - PART 7: INSTRUMENTS FOR THE MEASUREMENT OF AUDITORY EVOKED POTENTIALS
    CEI EN 60645-1 : 2016 ELECTROACOUSTICS - AUDIOMETRIC EQUIPMENT - PART 1: EQUIPMENT FOR PURE-TONE AUDIOMETRY
    BS EN 60118-0 : 2015 ELECTROACOUSTICS - HEARING AIDS - PART 0: MEASUREMENT OF THE PERFORMANCE CHARACTERISTICS OF HEARING AIDS
    BS EN 60268-16 : 2011 SOUND SYSTEM EQUIPMENT - PART 16: OBJECTIVE RATING OF SPEECH INTELLIGIBILITY BY SPEECH TRANSMISSION INDEX
    UNE-EN 55024:2011 Information technology equipment - Immunity characteristics - Limits and methods of measurement
    I.S. EN 60318-2:1999 ELECTROACOUSTICS - SIMULATORS OF HUMAN HEAD AND EAR - PART 2: AN INTERIM ACOUSTIC COUPLER FOR THE CALIBRATION OF AUDIOMETRIC EARPHONES IN THE EXTENDED HIGH-FREQUENCY RANGE
    I.S. EN ISO 389-1:2018 ACOUSTICS - REFERENCE ZERO FOR THE CALIBRATION OF AUDIOMETRIC EQUIPMENT - PART 1: REFERENCE EQUIVALENT THRESHOLD SOUND PRESSURE LEVELS FOR PURE TONES AND SUPRA-AURAL EARPHONES (ISO 389-1:2017)
    ANSI C63.19 : 2011 METHODS OF MEASUREMENT OF COMPATIBILITY BETWEEN WIRELESS COMMUNICATIONS DEVICES AND HEARING AIDS
    I.S. EN 60645-1:2017 ELECTROACOUSTICS - AUDIOMETRIC EQUIPMENT - PART 1: EQUIPMENT FOR PURE-TONE AND SPEECH AUDIOMETRY
    I.S. EN 55024:2010 INFORMATION TECHNOLOGY EQUIPMENT - IMMUNITY CHARACTERISTICS - LIMITS AND METHODS OF MEASUREMENT
    CSA Z107.56 : 2013 MEASUREMENT OF NOISE EXPOSURE
    BS EN 55024 : 2010 INFORMATION TECHNOLOGY EQUIPMENT - IMMUNITY CHARACTERISTICS - LIMITS AND METHODS OF MEASUREMENT
    ANSI/ASA S3.7 : 2016 METHOD FOR MEASUREMENT AND CALIBRATION OF EARPHONES
    UNI EN ISO 389-9 : 2009 ACOUSTICS - REFERENCE ZERO FOR THE CALIBRATION OF AUDIOMETRIC EQUIPMENT - PART 9: PREFERRED TEST CONDITIONS FOR THE DETERMINATION OF REFERENCE HEARING THRESHOLD LEVELS
    ISO 389-1:2017 Acoustics — Reference zero for the calibration of audiometric equipment — Part 1: Reference equivalent threshold sound pressure levels for pure tones and supra-aural earphones
    IEEE DRAFT C63.19 : 2005 METHODS OF MEASUREMENT OF COMPATIBILITY BETWEEN WIRELESS COMMUNICATIONS DEVICES AND HEARING AIDS
    10/30213857 DC : 0 BS ISO 8253-3 - ACOUSTICS - AUDIOMETRIC TEST METHODS - PART 3: SPEECH AUDIOMETRY
    NBR IEC/CISPR 24 : 2014 INFORMATION TECHNOLOGY EQUIPMENT - IMMUNITY CHARACTERISTICS - LIMITS AND METHODS OF MEASUREMENT
    I.S. EN ISO 389-9:2009 ACOUSTICS - REFERENCE ZERO FOR THE CALIBRATION OF AUDIOMETRIC EQUIPMENT - PART 9: PREFERRED TEST CONDITIONS FOR THE DETERMINATION OF REFERENCE HEARING THRESHOLD LEVELS
    CEI EN 60645-3 : 2008 ELECTROACOUSTICS - AUDIOMETRIC EQUIPMENT - PART 3: TEST SIGNALS OF SHORT DURATION
    IEC 60645-1 REDLINE : 4ED 2017 ELECTROACOUSTICS - AUDIOMETRIC EQUIPMENT - PART 1: EQUIPMENT FOR PURE-TONE AND SPEECH AUDIOMETRY
    I.S. EN 60645-3:2007 ELECTROACOUSTICS - AUDIOMETRIC EQUIPMENT - PART 3: TEST SIGNALS OF SHORT DURATION
    I.S. EN 60268-7:2011 SOUND SYSTEM EQUIPMENT - PART 7: HEADPHONES AND EARPHONES
    I.S. EN 60268-16:2011 SOUND SYSTEM EQUIPMENT - PART 16: OBJECTIVE RATING OF SPEECH INTELLIGIBILITY BY SPEECH TRANSMISSION INDEX
    IEC 60645-1:2017 Electroacoustics - Audiometric equipment - Part 1: Equipment for pure-tone and speech audiometry
    UNE-EN 60645-1:2015 Electroacoustics - Audiometric equipment - Part 1: Equipment for pure-tone audiometry
    DIN EN ISO 389-6 E : 2007 ACOUSTICS - REFERENCE ZERO FOR THE CALIBRATION OF AUDIOMETRIC EQUIPMENT - PART 6: REFERENCE THRESHOLD OF HEARING FOR TEST SIGNALS OF SHORT DURATION
    DIN EN ISO 8253-3 E : 2012 ACOUSTICS - AUDIOMETRIC TEST METHODS - PART 3: SPEECH AUDIOMETRY (ISO 8253-3:2012)
    DIN EN ISO 389-8 E : 2004 ACOUSTICS - REFERENCE ZERO FOR THE CALIBRATION OF AUDIOMETRIC EQUIPMENT - PART 8: REFERENCE EQUIVALENT THRESHOLD SOUND PRESSURE LEVELS FOR PURE TONES AND CIRCUMAURAL EARPHONES
    DIN EN ISO 389-5 E : 2007 ACOUSTICS - REFERENCE ZERO FOR THE CALIBRATION OF AUDIOMETRIC EQUIPMENT - PART 5: REFERENCE EQUIVALENT THRESHOLD SOUND PRESSURE LEVELS FOR PURE TONES IN THE FREQUENCY RANGE 8 KHZ TO 16 KHZ
    IEC 60645-1:2017 RLV Electroacoustics - Audiometric equipment - Part 1: Equipment for pure-tone and speech audiometry
    BS EN ISO 8253-3:2012 (published 2012-03) Acoustics. Audiometric test methods Speech audiometry
    ISO 389-9:2009 Acoustics Reference zero for the calibration of audiometric equipment Part 9: Preferred test conditions for the determination of reference hearing threshold levels
    IEC 60118-0:2015 Electroacoustics - Hearing aids - Part 0: Measurement of the performance characteristics of hearing aids
    UNE-EN 60118-0:2016 Electroacoustics - Hearing aids - Part 0: Measurement of the performance characteristics of hearing aids
    ISO 389-6:2007 Acoustics Reference zero for the calibration of audiometric equipment Part 6: Reference threshold of hearing for test signals of short duration
    DIN EN ISO 8253-3:2012-08 ACOUSTICS - AUDIOMETRIC TEST METHODS - PART 3: SPEECH AUDIOMETRY (ISO 8253-3:2012)
    ISO 389-8:2004 Acoustics — Reference zero for the calibration of audiometric equipment — Part 8: Reference equivalent threshold sound pressure levels for pure tones and circumaural earphones
    BS EN ISO 8253-1 : 2010 ACOUSTICS - AUDIOMETRIC TEST METHODS - PART 1: PURE-TONE AIR AND BONE CONDUCTION AUDIOMETRY
    IEC 60268-7:2010 Sound system equipment - Part 7: Headphones and earphones
    BS EN ISO 389-6 : 2007 ACOUSTICS - REFERENCE ZERO FOR THE CALIBRATION OF AUDIOMETRIC EQUIPMENT - PART 6: REFERENCE THRESHOLD OF HEARING FOR TEST SIGNALS OF SHORT DURATION
    ISO/TR 389-5:1998 Acoustics Reference zero for the calibration of audiometric equipment Part 5: Reference equivalent threshold sound pressure levels for pure tones in the frequency range 8 kHz to 16 kHz
    ISO 8253-1:2010 Acoustics Audiometric test methods Part 1: Pure-tone air and bone conduction audiometry
    CISPR 24:2010+AMD1:2015 CSV Information technology equipment - Immunity characteristics - Limitsand methods of measurement
    IEC 61842:2002 Microphones and earphones for speech communications
    IEC 60645-3:2007 Electroacoustics - Audiometric equipment - Part 3: Test signals of short duration
    UNE-EN 60268-7:2013 Sound system equipment -- Part 7: Headphones and earphones
    ISO 389-5:2006(R2014) ACOUSTICS - REFERENCE ZERO FOR THE CALIBRATION OF AUDIOMETRIC EQUIPMENT - PART 5: REFERENCE EQUIVALENT THRESHOLD SOUND PRESSURE LEVELS FOR PURE TONES IN THE FREQUENCY RANGE 8 KHZ TO 16 KHZ
    IEC 60268-16:2011 Sound system equipment - Part 16: Objective rating of speech intelligibility by speech transmission index
    ISO 8253-3:2012 Acoustics Audiometric test methods Part 3: Speech audiometry
    BS EN ISO 389-8:2004 (published 2004-06) Acoustics. Reference zero for the calibration of audiometric equipment Reference equivalent threshold sound pressure levels for pure tones and circumaural earphones
    IEC 60318-2:1998 Electroacoustics - Simulators of human head and ear - Part 2: An interim acoustic coupler for the calibration of audiometric earphones in the extended high-frequency range
    BS EN ISO 389-5:2006 Acoustics. Reference zero for the calibration of audiometric equipment Reference equivalent threshold sound pressure levels for pure tones in the frequency range 8 kHz to 16 kHz
    EN 60268-16:2011 SOUND SYSTEM EQUIPMENT - PART 16: OBJECTIVE RATING OF SPEECH INTELLIGIBILITY BY SPEECH TRANSMISSION INDEX
    EN 60268-7:2011 SOUND SYSTEM EQUIPMENT - PART 7: HEADPHONES AND EARPHONES
    EN ISO 389-1 : 2000 ACOUSTICS - REFERENCE ZERO FOR THE CALIBRATION OF AUDIOMETRIC EQUIPMENT - PART 1: REFERENCE EQUIVALENT THRESHOLD SOUND PRESSURE LEVELS FOR PURE TONES AND SUPRA-AURAL EARPHONES (ISO 389-1:2017)
    I.S. EN ISO 8253-3:2012 ACOUSTICS - AUDIOMETRIC TEST METHODS - PART 3: SPEECH AUDIOMETRY (ISO 8253-3:2012)
    I.S. EN ISO 8253-1:2010 ACOUSTICS - AUDIOMETRIC TEST METHODS - PART 1: PURE-TONE AIR AND BONE CONDUCTION AUDIOMETRY
    I.S. EN ISO 389-5:2006 ACOUSTICS - REFERENCE ZERO FOR THE CALIBRATION OF AUDIOMETRIC EQUIPMENT - PART 5: REFERENCE EQUIVALENT THRESHOLD SOUND PRESSURE LEVELS FOR PURE TONES IN THE FREQUENCY RANGE 8 KHZ TO 16 KHZ
    EN 60645-3:2007 ELECTROACOUSTICS - AUDIOMETRIC EQUIPMENT - PART 3: TEST SIGNALS OF SHORT DURATION
    NF EN 60645-3 : 2007 ELECTROACOUSTICS - AUDIOMETRIC EQUIPMENT - PART 3: TEST SIGNALS OF SHORT DURATION
    ISO 389-5:2006 Acoustics Reference zero for the calibration of audiometric equipment Part 5: Reference equivalent threshold sound pressure levels for pure tones in the frequency range 8 kHz to 16 kHz
    DIN EN ISO 389-6:2007-10 Acoustics - Reference zero for the calibration of audiometric equipment - Part 6: Reference threshold of hearing for test signals of short duration (ISO 389-6:2007)
    EN ISO 8253-3:2012 ACOUSTICS - AUDIOMETRIC TEST METHODS - PART 3: SPEECH AUDIOMETRY (ISO 8253-3:2012)
    EN 60318-2 : 1998 ELECTROACOUSTICS - SIMULATORS OF HUMAN HEAD AND EAR - PART 2: AN INTERIM ACOUSTIC COUPLER FOR THE CALIBRATION OF AUDIOMETRIC EARPHONES IN THE EXTENDED HIGH-FREQUENCY RANGE
    EN 55024 : 2010 AMD 1 2015 INFORMATION TECHNOLOGY EQUIPMENT - IMMUNITY CHARACTERISTICS - LIMITS AND METHODS OF MEASUREMENT (CISPR 24:2010/A1:2015)
    DIN EN ISO 389-5:2007-05 Acoustics - Reference zero for the calibration of audiometric equipment - Part 5: Reference equivalent threshold sound pressure levels for pure tones in the frequency range 8 kHz to 16 kHz (ISO 389-5:2006)
    EN 60118-0:2015 ELECTROACOUSTICS - HEARING AIDS - PART 0: MEASUREMENT OF THE PERFORMANCE CHARACTERISTICS OF HEARING AIDS (IEC 60118-0:2015)
    EN 61842 : 2002 MICROPHONES AND EARPHONES FOR SPEECH COMMUNICATIONS
    EN 60645-1:2017 ELECTROACOUSTICS - AUDIOMETRIC EQUIPMENT - PART 1: EQUIPMENT FOR PURE-TONE AND SPEECH AUDIOMETRY (IEC 60645-1:2017)
    DIN EN ISO 389-8:2004-11 Acoustics - Reference zero for the calibration of audiometric equipment - Part 8: Reference equivalent threshold sound pressure levels for pure tones and circumaural earphones (ISO 389-8:2004)
    EN ISO 389-5 : 2006 ACOUSTICS - REFERENCE ZERO FOR THE CALIBRATION OF AUDIOMETRIC EQUIPMENT - PART 5: REFERENCE EQUIVALENT THRESHOLD SOUND PRESSURE LEVELS FOR PURE TONES IN THE FREQUENCY RANGE 8 KHZ TO 16 KHZ
    EN ISO 389-8 : 2004 ACOUSTICS - REFERENCE ZERO FOR THE CALIBRATION OF AUDIOMETRIC EQUIPMENT - PART 8: REFERENCE EQUIVALENT THRESHOLD SOUND PRESSURE LEVELS FOR PURE TONES AND CIRCUMAURAL EARPHONES
    EN ISO 389-9 : 2009 ACOUSTICS - REFERENCE ZERO FOR THE CALIBRATION OF AUDIOMETRIC EQUIPMENT - PART 9: PREFERRED TEST CONDITIONS FOR THE DETERMINATION OF REFERENCE HEARING THRESHOLD LEVELS
    EN ISO 389-6 : 2007 ACOUSTICS - REFERENCE ZERO FOR THE CALIBRATION OF AUDIOMETRIC EQUIPMENT - PART 6: REFERENCE THRESHOLD OF HEARING FOR TEST SIGNALS OF SHORT DURATION
    UNI EN ISO 8253-3 : 2012 ACOUSTICS - AUDIOMETRIC TEST METHODS - PART 3: SPEECH AUDIOMETRY
    EN ISO 8253-1:2010 ACOUSTICS - AUDIOMETRIC TEST METHODS - PART 1: PURE-TONE AIR AND BONE CONDUCTION AUDIOMETRY
    UNI EN ISO 8253-1 : 2010 ACOUSTICS - AUDIOMETRIC TEST METHODS - PART 1: PURE-TONE AIR AND BONE CONDUCTION AUDIOMETRY

    Standards Referencing This Book - (Show below) - (Hide below)

    IEC 61094-4:1995 Measurement microphones - Part 4: Specifications for working standard microphones
    IEC 61094-1:2000 Measurement microphones - Part 1: Specifications for laboratory standard microphones
    AS/NZS ISO 389.1:2019 Acoustics - Reference zero for the calibration of audiometric equipment Reference equivalent threshold sound pressure levels for pure tones and supra-aural earphones
    ISO 389-8:2004 Acoustics — Reference zero for the calibration of audiometric equipment — Part 8: Reference equivalent threshold sound pressure levels for pure tones and circumaural earphones
    AS/NZS ISO 8253.3:2019 Acoustics - Audiometric test methods Speech audiometry
    ISO 389-1:1998 Acoustics Reference zero for the calibration of audiometric equipment Part 1: Reference equivalent threshold sound pressure levels for pure tones and supra-aural earphones
    IEC 61094-2:2009 Electroacoustics - Measurement microphones - Part 2: Primary method for pressure calibration of laboratory standard microphones by the reciprocity technique
    ISO 389-5:2006(R2014) ACOUSTICS - REFERENCE ZERO FOR THE CALIBRATION OF AUDIOMETRIC EQUIPMENT - PART 5: REFERENCE EQUIVALENT THRESHOLD SOUND PRESSURE LEVELS FOR PURE TONES IN THE FREQUENCY RANGE 8 KHZ TO 16 KHZ
    IEC 61094-6:2004 Measurement microphones - Part 6: Electrostatic actuators for determination of frequency response
    AS/NZS ISO 8253.1:2019 Acoustics - Audiometric test methods Pure-tone air and bone conduction audiometry
    ISO/IEC Guide 98-3:2008 Uncertainty of measurement Part 3: Guide to the expression of uncertainty in measurement (GUM:1995)
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