Table of Contents

1 -  AS 60118.0-2007 Hearing aids Part 0: Measurement of electroacoustical characteristics
4 -  PREFACE
5 -  CONTENTS
7 -  1 Scope
7 -  2 Object
7 -  3 General conditions
8 -  4 Explanation of terms
8 -  4.1 Ear simulator
8 -  4.2 Substitution method
8 -  4.3 Comparison method
8 -  4.4 Pressure method
8 -  4.5 Simulated in situ method
8 -  4.6 Reference orientation (of a hearing aid)
8 -  4.7 Reference point (of a hearing aid)
8 -  4.8 Test point
8 -  4.9 Supply voltage
8 -  4.10 Acoustic gain - at a specified frequency and under specified operating conditions
9 -  4.11 Full-on acoustic gain (frequency response curve)
9 -  4.12 Maximum acoustic gain at a specified frequency
9 -  4.13 Saturation sound pressure level (frequency response curve)
9 -  4.14 Maximum saturation sound pressure level.
9 -  4.15 Output sound pressure level for an input sound pressure level of 90 dB (OSPL90) at a specified frequency (or frequencies)
9 -  4.16 Reference test frequency
9 -  4.17 Reference test gain control position
9 -  4.18 Reference test gain
9 -  4.19 Frequency response
9 -  4.20 Comprehensive frequency response curves
10 -  4.21 Basic frequency response curve
10 -  4.22 Steady state input-output graph
10 -  5 Test equipment.
10 -  5.1 Acoustical requirements for the test enclosure
10 -  5.2 Sound field at the test point.
10 -  5.3 Ear simulator
10 -  5.4 Equipment for the measurement of sound pressure level in the ear simulator
11 -  5.5 Calibration of free-field sound pressure level
11 -  6 Test conditions
11 -  6.1 Choice of test point
12 -  6.2 Calibrating the sound field
12 -  6.3 Locating the hearing aid for tests
12 -  6.4 Normal operating conditions for the hearing aid
13 -  7 Measurements
14 -  7.1 Maximum saturation sound pressure level
14 -  7.2 Output sound pressure level frequency response for an input SPL of 90 dB
14 -  7.3 Full-on acoustic gain frequency response
15 -  7.4 Comprehensive frequency responses and basic frequency response
15 -  7.5 Effect of tone control position on the basic frequency response
15 -  7.6 Effect of gain control position on frequency response
15 -  7.7 Characteristics of the gain control.
16 -  7.8 Effect on the full-on acoustic gain of variation of battery or supply voltage
16 -  7.9 Effect on the full-on acoustic gain of variation of internal resistance of battery or supply
16 -  7.10 Effect on OSPL90 of variation of battery or supply voltage
16 -  7.11 Battery current
17 -  7.12 Measurement of amplitude non-linearities in hearing aids
19 -  7.13 Effect on amplitude non-linearities of variation of battery or supply voltage and internal impedance
19 -  7.14 Internal noise generated in the hearing aid.
20 -  7.15 Characteristics of hearing aids with induction pick-up coil input
21 -  7.16 Characteristics of hearing aids with automatic gain control circuits
21 -  8 Frequency response recording chart
22 -  Annex A Harmonic and intermodulation distortion

Abstract

Adopts IEC 60118-0 to describe the measurement of physical performance characteristics of air conduction hearing aids based on a free-field technique and measured with an ear simulator.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	Standards Australia
Pages
ISBN
Committee	AV-003
Supersedes	DR 06465 CP AS 1088.0-1987