ISO 389-3:2016 PDF

Scope: This part of ISO 389 specifies the following data applicable to the calibration of bone vibrators for puretone bone-conduction audiometry: a) reference equivalent threshold vibratory force levels (RETVFL), corresponding to the threshold of hearing of young otologically normal persons by bone-conduction audiometry; c) essential characteristics of the masking noise and the baseline masking noise level applied to the ear not under test. b) essential characteristics of the bone vibrator and the method of coupling to the test subject, and to the mechanical coupler; Guidance on the practical application of this part of ISO 389 in the calibration of audiometers is given in Annex B. RETVFL is the vibratory force level transmitted to a mechanical coupler of specified characteristics by a vibrator when applied to the mechanical coupler under stated conditions of test and when energized at the voltage level corresponding to the normal threshold of hearing for location on the mastoid prominence. NOTE 1 Values for the differences in reference equivalent threshold vibratory force levels between location on the forehead and mastoid are included for information in Annex C. NOTE 2 Recommended procedures for carrying out bone-conduction audiometry are specified in ISO 8253-1.

ISO 389-3:2016 Referenced Document

IEC 60318-6:2007 Electroacoustics - Simulators of human head and ear - Part 6: Mechanical coupler for the measurement of bone vibrators
IEC 61260-1:2014 IEC 61260-1: Electroacoustics - Octave-band and fractional-octave-band filters - Part 1: Specifications
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
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
ISO 389-4:1994 Acoustics - Reference zero for the calibration of audiometric equipment - Part 4: Reference levels for narrow-band masking noise
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 4869-1:1990 Acoustics; hearing protectors; part 1: subjective method for the measurement of sound attenuation
ISO 8253-1:2010 Acoustics - Audiometric test methods - Part 1: Pure-tone air and bone conduction audiometry

2016 ISO 389-3:2016 Acoustics - Reference zero for the calibration of audiometric equipment - Part 3: Reference equivalent threshold vibratory force levels for pure tones and bone vibrators
1995 ISO 389-3:1994/Cor 1:1995 Acoustics - Reference zero for the calibration of audiometric equipment - Part 3: Reference equivalent threshold force levels for pure tones and bone vibrators.Technical corrigendum 1
1994 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