Table of Contents

1 -  AS 60118.8-2007 Hearing aids Part 8: Methods of measurement of performance characteristics of hearing aids under simulated in situ working conditions
4 -  PREFACE
5 -  CONTENTS
6 -  Introduction
7 -  1 Scope
7 -  2 Normative references
8 -  3 Terms and definitions
11 -  4 Limitations
11 -  5 Test equipment
11 -  5.1 Acoustical requirements for the test space
12 -  5.2 Sound source
12 -  5.3 Manikin
12 -  5.4 Ear simulator
12 -  5.5 Ear insert simulator
12 -  5.6 Equipment for the measurement of occluded-ear simulator sound pressure level
13 -  5.7 Equipment for automatic sweep frequency recording.
13 -  5.8 Equipment for calibration of free field sound pressure level.
13 -  6 Test conditions
13 -  6.1 Choice of test point.
14 -  6.2 Ambient conditions.
14 -  6.3 Manikin
14 -  6.4 Location of the hearing aid.
14 -  6.5 Normal operating conditions for the hearing aid
15 -  7 Measurements
15 -  7.1 General
15 -  7.2 Adjustment of the reference input sound pressure level
16 -  7.3 Manikin frequency response (MFR)
16 -  7.4 Full-on simulated insertion gain measured by the constant reference input SPL method
17 -  7.5 Full-on simulated insertion gain measured by the constant ear simulator SPL method
17 -  7.6 Directional characteristics
19 -  7.7 Simulated in situ OSPL90 measurements
20 -  7.8 Simplified method to measure simulated in situ and insertion gain response.
20 -  8 Frequency response recording charts
20 -  9 Maximum permitted expanded uncertainty of measurements
22 -  Annex A (normative) Free-field to hearing-aid-microphone transformation
26 -  Annex B (normative) Manikin unoccluded-ear gain (open ear response)
28 -  Annex C (informative) General requirements for a manikin
31 -  Bibliography

Abstract

Adopts IEC 60118-8 to describe methods of test which simulates the acoustical effects of a median adult wearer on the performance of a hearing aid.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	Standards Australia
Pages
ISBN
Committee	AV-003
Supersedes	AS 1088.8-1987 DR 06473 CP