AS IEC 60645.1 pdf download

AS IEC 60645.1 pdf download Electroacoustics—Audiological equipment Part 1: Pure-tone audiometers (IEC 60645-1:2001, MOD)
1Scope and object
This part of IEC 60645 specifies general requirements for audiometers and particularrequirements for pure-tone audiometers designed for use in determining hearing thresholdlevels,in comparison with standard reference threshold levels by means of psychoacoustictest methods.
The object of this lnternational Standard is to ensure:
a) that tests of hearing, particularly threshold, in the frequency range 125 Hz to 8 000 Hz ona given human ear performed with different audiometers which comply with thisInternational Standard using methods described in ISO 8253-1 and lSo 6i89 shall givesubstantially the same results;
b) that the results obtained represent a valid comparison between the hearing of the ear tested and the reference threshold of hearing;
c) that audiometers are classified according to the range of test signals they generate,
according to the mode of operation or according to the complexity of the range of auditoryfunctions they test.
Normative references
The following normative documents contain provisions which，through reference in this text,constitute provisions of this part of lEC 60645.For dated references,subsequent amend-ments to， or revisions of，any of these publications do not apply. However，parties toagreements based on this part of lEC 60645 are encouraged to investigate the possibility ofapplying the most recent editions of the normative documents indicated below.For undatedreferences, the latest edition of the normative document referred to applies. Members of lSOand lEC maintain registers of currently valid International Standards.
IEC 60126，IEC reference coupler for the measurement of hearing aids using earphonescoupled to the ear by means of ear inserts
IEC 60268-3，Sound system equipment – Part 3: Amplifiers
IEC 60318-1，Electroacoustics – Simulators of human head and ear – Part 1 : Ear simulator forthe calibration of supra-aural earphones
IEC 60318-2，Electroacoustics – Simulators of human head and ear – Part 2: An interimacoustic coupler for the calibration of audiometric earphones in the extended high frequencyrange
IEC 60318-3，Electroacoustics – Simulators of human head and ear – Part 3:Acoustic couplerfor the calibration of supra-aural earphones used in audiometry
IEC 60373,Mechanical coupler for measurements on bone vibrators
IEC 60601-1,Medical electrical equipment – Part 1 : General requirements for safety
3 Terms and definitions
For the purposes of this part of IEC 60645, the following terms and definitions apply.
3.1
pure tone audiometer
instrument for the measurement of hearing for pure tones and in particular the threshold of hearing
NOTE The audiometer may be either of a fixed or continuous sweep frequency type.
3.2
manual audiometer
audiometer in which signal presentations and recording of results are performed manually
3.3
automatic-recording audiometer
audiometer in which signal presentations, hearing level variation, frequency selection or frequency variation, and recording of subject’s responses are implemented automatically
NOTE Direction of hearing level changes is under subject’s control and is recorded automatically.
3.4
computer-controlled audiometer
audiometer in which the test procedure is controlled by computer or microprocessor and not by a manual operator
3.5
speech audiometer
instrument for the measurement of hearing for speech test material
3.6
air conduction
transmission of sound through the external and middle ear to the inner ear