AS 60118.8-2007

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