SN EN 60118-8 : 2005
Current
The latest, up-to-date edition.
ELECTROACOUSTICS - HEARING AIDS - PART 8: METHODS OF MEASUREMENT OF PERFORMANCE CHARACTERISTICS OF HEARING AIDS UNDER SIMULATED IN SITU WORKING CONDITIONS
12-01-2013
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Limitations
5 Test equipment
5.1 Acoustical requirements for the test space
5.2 Sound source
5.3 Manikin
5.4 Ear simulator
5.5 Ear insert simulator
5.6 Equipment for the measurement of occluded-ear simulator
sound pressure level
5.7 Equipment for automatic sweep frequency recording
5.8 Equipment for calibration of free field sound pressure level
6 Test conditions
6.1 Choice of test point
6.2 Ambient conditions
6.3 Manikin
6.4 Location of the hearing aid
6.5 Normal operating conditions for the hearing aid
7 Measurements
7.1 General
7.2 Adjustment of the reference input sound pressure level
7.3 Manikin frequency response (MFR)
7.4 Full-on simulated insertion gain measured by the constant
reference input SPL method
7.5 Full-on simulated insertion gain measured by the constant
ear simulator SPL method
7.6 Directional characteristics
7.7 Simulated in situ OSPL measurements
7.8 Simplified method to measure simulated in situ and
insertion gain response
8 Frequency response recording charts
9 Maximum permitted expanded uncertainty of measurements
Annex A (normative) Free-field to hearing-aid-microphone
transformation
Annex B (normative) Manikin unoccluded-ear gain (open ear
response)
Annex C (informative) General requirements for a manikin
Annex ZA (normative) Normative references to international
publications with their corresponding European
publications
Bibliography
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