SIST EN ISO 389-8:2004 PDF

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)

Title (English):

SIST 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 389-8:2004)

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 9
Publication date:: September 1, 2004
ICS:: 13.140
Technical committee:: AKU - Acoustics

Document language:

enru

Delivery time:1–7 days

Price:52 €

Description (English):

ISO 389-8:2004 specifies reference equivalent threshold sound pressure levels (RETSPLs) for pure tones in the frequency range from 125 Hz to 8 kHz, applicable to the calibration of air conduction audiometers equipped with a particular model of circumaural earphones (SENNHEISER HDA 200). Some notes and references on the derivation and the test conditions used to determine the recommended reference levels are given in Annex A and the Bibliography. The sound attenuation of the earphone is given in Annex B. For speech audiometers of types A-E and B-E, the correction figures of the earphone for a free-field equivalent output are given in Annex C.

Technical details

SKU: SIST EN ISO 389-8:2004

Abstract

Overview

EN ISO 389-8:2004 (ISO 389-8:2004) defines reference equivalent threshold sound pressure levels (RETSPLs) for pure tones delivered by a specified model of circumaural earphone (SENNHEISER HDA 200). The standard covers RETSPLs in the frequency range 125 Hz to 8 kHz for the calibration of air-conduction audiometers and provides supporting data (attenuation and free-field correction figures) in informative annexes. Values are derived from multi-laboratory measurements on otologically normal subjects and are intended to establish a common calibration reference (“reference zero”) for audiometric equipment.

Key Topics

Scope and purpose: Establish RETSPLs for pure-tone audiometry using the HDA 200 circumaural earphone (125 Hz–8 kHz).
Reference coupling: Calibration is specified for an ear simulator and adapter per IEC 60318-1 and IEC 60318-2 (Figure 1).
RETSPL values: Tabulated RETSPLs (in dB re 20 μPa) are given for standard audiometric frequencies (e.g., 1 000 Hz ≈ 5.5 dB; 4 000 Hz ≈ 9.5 dB; 8 000 Hz ≈ 17.5 dB). Full values are presented in Table 1 of the standard.
Environmental and mechanical conditions: Calibration is recommended at 21 °C to 25 °C; headband force for the HDA 200 is specified as 10.0 N ± 1.0 N with defined positioning dimensions.
Annex B - sound attenuation: Provides mean attenuation data for the HDA 200 across octave bands (useful for assessing background-noise protection).
Annex C - free-field corrections: Gives correction figures to convert coupler measurements to free-field equivalent outputs (applicable to speech audiometer calibration).
Derivation and traceability: RETSPLs are based on results from five independent investigations (see Annex A and Bibliography).

Applications

Calibration of clinical and occupational audiometers using circumaural earphones (SENNHEISER HDA 200).
Reference for audiology clinics, calibration laboratories, device manufacturers and test houses to ensure consistent pure-tone threshold measurements.
Use in hearing conservation programs, regulatory compliance, and research where standardized audiometric calibration is required.
Basis for producing free-field-equivalent outputs for speech audiometry and for assessing earphone noise attenuation characteristics.

Related Standards

ISO 389-1 (supra-aural earphones)
ISO/TR 389-5 (extended high-frequency RETSPLs)
IEC 60318-1, IEC 60318-2 (ear simulators/adapters)
IEC 60645-2 (speech audiometers)

Keywords: EN ISO 389-8:2004, ISO 389-8, RETSPL, circumaural earphones, SENNHEISER HDA 200, audiometer calibration, audiometric equipment calibration, IEC 60318-1, free-field correction.

Related standards

Standards mentioned in the description

Abstract

Overview

Key Topics

Scope and purpose: Establish RETSPLs for pure-tone audiometry using the HDA 200 circumaural earphone (125 Hz–8 kHz).
Reference coupling: Calibration is specified for an ear simulator and adapter per IEC 60318-1 and IEC 60318-2 (Figure 1).
RETSPL values: Tabulated RETSPLs (in dB re 20 μPa) are given for standard audiometric frequencies (e.g., 1 000 Hz ≈ 5.5 dB; 4 000 Hz ≈ 9.5 dB; 8 000 Hz ≈ 17.5 dB). Full values are presented in Table 1 of the standard.
Environmental and mechanical conditions: Calibration is recommended at 21 °C to 25 °C; headband force for the HDA 200 is specified as 10.0 N ± 1.0 N with defined positioning dimensions.
Annex B - sound attenuation: Provides mean attenuation data for the HDA 200 across octave bands (useful for assessing background-noise protection).
Annex C - free-field corrections: Gives correction figures to convert coupler measurements to free-field equivalent outputs (applicable to speech audiometer calibration).
Derivation and traceability: RETSPLs are based on results from five independent investigations (see Annex A and Bibliography).

Applications

Calibration of clinical and occupational audiometers using circumaural earphones (SENNHEISER HDA 200).
Reference for audiology clinics, calibration laboratories, device manufacturers and test houses to ensure consistent pure-tone threshold measurements.
Use in hearing conservation programs, regulatory compliance, and research where standardized audiometric calibration is required.
Basis for producing free-field-equivalent outputs for speech audiometry and for assessing earphone noise attenuation characteristics.

Related Standards

ISO 389-1 (supra-aural earphones)
ISO/TR 389-5 (extended high-frequency RETSPLs)
IEC 60318-1, IEC 60318-2 (ear simulators/adapters)
IEC 60645-2 (speech audiometers)

Keywords: EN ISO 389-8:2004, ISO 389-8, RETSPL, circumaural earphones, SENNHEISER HDA 200, audiometer calibration, audiometric equipment calibration, IEC 60318-1, free-field correction.

SIST EN ISO 389-8:2004 PDF

Technical details

Abstract

Overview

Key Topics

Applications

Related Standards

Related standards

Abstract

Overview

Key Topics

Applications

Related Standards

Related standards

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