Audiometric Calibration and Standards: Reference Levels
The ISO 389 series which specifies audiometric reference levels, have all been adopted as dual numbered BS EN ISO standards.
The reference levels given in the ISO 389 series refer to people in the age range 18-30 years. The statistical distribution of hearing thresholds observed as a function of age is specified in ISO 7029 2000 and has been adopted as dual numbered BS EN ISO standard. Equal-loudness contours for listening in free sound fields are given in BS ISO 226:2003.
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| International Standards | National Standards |
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| 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 | 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 |
| ISO 389-2:1994 Acoustics. Reference zero for the calibration of audiometric equipment - Part 2: Reference equivalent threshold sound pressure levels for pure tones and insert earphones | BS EN ISO 389-2:1997 Acoustics. Reference zero for the calibration of audiometric equipment - Part 2: Reference equivalent threshold sound pressure levels for pure tones and insert earphones |
| ISO 389-3:1994 Acoustics. Reference zero for the calibration of audiometric equipment - Part 3: Reference equivalent threshold force levels for pure tones and bone vibrators | BS EN ISO 389-3:1999 Acoustics. Reference zero for the calibration of audiometric equipment - Part 3: Reference equivalent threshold force levels for pure tones and bone vibrators |
| ISO 389-4:1994 Acoustics. Reference zero for the calibration of audiometric equipment - Part 4: Reference levels for narrow-band masking noise | BS EN ISO 389-4:1999 Acoustics. Reference zero for the calibration of audiometric equipment - Part 4: Reference levels for narrow-band masking noise |
| 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 | BS 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 |
| ISO 389-7:2005 Acoustics. Reference zero for the calibration of audiometric equipment - Part 7: Reference threshold of hearing under free-field and diffuse-field listening conditions | BS EN ISO 389-7:2005 Acoustics. Reference zero for the calibration of audiometric equipment - Part 7: Reference threshold of hearing under free-field and diffuse-field listening conditions |
| 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 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 |
| ISO 7029:2000 Acoustics. Statistical distribution of hearing thresholds as a function of age | BS EN ISO 7029:2000 Acoustics. Statistical distribution of hearing thresholds as a function of age (replaces BS 6951:1988) |
| ISO 226:2003 Acoustics. Normal equal-loudness level contours | BS ISO 226:2003 Acoustics. Normal equal-loudness level contours (replaces BS 3383:1988) |
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BSI/ISO/IEC websites
For the most up-to-date information regarding current audiometric standards, as well as pricing and ordering details on all the standards listed here, please contact the relevant standards organisation:
Members of the BSA (British Society of Audiology) can register for the BSA Standards Forum (hosted by NPL), which allows members to view and comment on standards which are currently in development or under revision.
NPL also offers audiometric calibration services, as well as training courses on all aspects of audiometry.