Audiometric Calibration and Standards: Audiometers and Impedance Admittance Meters
The IEC 60645 series, which specifies the minimum performance requirements for audiometers, has been adopted as dual numbered BS EN standards.
Using IEC 60645-1 as a basis, OIML Recommendation R 104 specifies requirements for the pattern evaluation and verification of pure-tone audiometers. It also usefully summarises the relevant reference levels given in the ISO 389 series, and lists a set of recommended routine checks for audiometers. Although there are no regulations on the accuracy of audiometers used in the UK, the OIML Recommendation illustrates the good calibration practices already adopted in other countries.
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| International Standards and Recommendations | National Standards |
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| IEC 60645-1:2001 Audiological Equipment - Part 1: Pure-tone audiometers | BS EN 60645-1:2001 Audiological Equipment - Part 1: Pure-tone audiometers |
| IEC 60645-2:1993 Audiometers - Part 2: Equipment for speech audiometry | BS EN 60645-2:1997 Audiometers - Part 2: Equipment for speech audiometry |
| IEC 60645-3:2007 Audiometers - Part 3: Auditory test signals of short duration for audiometric and neuro-otological purposes | BS EN 60645-3:2007 Audiometers - Part 3: Auditory test signals of short duration for audiometric and neuro-otological purposes |
| IEC 60645-4:1994 Audiometers - Part 4: Equipment for extended high-frequency audiometry | BS EN 60645-4:1995 Audiometers - Part 4: Equipment for extended high-frequency audiometry |
| IEC 60645-5:2004 Audiometric equipment Part 5: Instruments for the measurement of aural acoustic impedance/admittance | BS EN 60645-5:2005 Audiometric equipment Part 5: Instruments for the measurement of aural acoustic impedance/admittance |
| IEC 60645-6:2009 Audiometric equipment - Part 6: Instruments for the measurement of otoacoustic emissions | BS EN 60645-6:2010 Audiometric equipment - Part 6: Instruments for the measurement of otoacoustic emissions |
| IEC 60645-7:2009 Audiometric equipment - Part 7: Instruments for the measurement of auditory brainstem responses | BS EN 60645-7:2010 Audiometric equipment - Part 7: Instruments for the measurement of auditory brainstem responses |
| OIML International Recommendation R 104:1993 Pure-tone audiometers | |
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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.