AS 60118.7-2007

1 - AS 60118.7-2007 Hearing aids Part 7: Measurement of the performance characteristics of hearing aids for production, supply and delivery quality assurance purposes
4 - PREFACE
5 - CONTENTS
7 - 1 Scope
7 - 2 Normative references
7 - 3 Terms and definitions
10 - 4 General conditions
10 - 4.1 Acoustic test method
10 - 4.2 Reporting of data
10 - 5 Nominal characteristics and tolerances
11 - 6 Test box and test equipment
11 - 6.1 General
11 - 6.2 Unwanted stimuli in the test box
11 - 6.3 Sound source
11 - 6.4 Acoustic coupler
11 - 6.5 Measurement system for the measurement of sound pressure level and harmonic distortion in the acoustic coupler
12 - 7 Test conditions
12 - 7.1 General
12 - 7.2 Control of the sound field
14 - 7.3 Normal operating conditions for a hearing aid
16 - 8 Measurements, specifications and tolerances
16 - 8.1 Frequency response curves
16 - 8.2 Output sound pressure level frequency response curve for an input sound pressure level of 90 dB (OSPL90 frequency response curve)
17 - 8.3 Full-on acoustic gain response curve
17 - 8.4 Basic frequency response curve at reference test gain setting
19 - 8.5 Battery current
19 - 8.6 Total harmonic distortion
19 - 8.7 Equivalent input nois
20 - 8.8 Additional measurements for hearing aids having induction pick-up coil
20 - 8.9 Additional measurements applying to AGC hearing aids
21 - 9 Maximum permitted expanded uncertainty of measurements
23 - Bibliography

Adopts IEC 60118-7 to give recommendations for the measurement of the performance characteristics of air-conduction hearing aids of a particular model for production, supply and delivery quality assurance properties.

Originated as part of AS 1088-1971.
Previous edition AS 1087.7-1987.
Revised and redesignated as AS 60118.7-2007.