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ASA S3.22 2014

ASA S3.22 2014

$91.54

ANSI/ASA S3.22-2014 American National Standard Specification of Hearing Aid Characteristics

Published By Publication Date Number of Pages
ASA 2014 54
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PDF Catalog

PDF Pages PDF Title
13 1 Scope, applications and purpose
1.1 Scope
1.2 Applications
1.3 Purpose
2 Normative references
14 3 Definitions
3.1 Terms relating to hearing aids
15 3.2 Terms relating to test equipment and test conditions
3.3 Terms relating to measurements with acoustic inputs
16 3.4 Terms relating to measurements with inductive inputs
4 Test equipment
4.1 Test space
17 4.2 Measurement configuration for nondirectional hearing aids
4.3 Measurement configuration for directional hearing aids
18 4.4 Sound source
4.5 Test signal
19 4.6 Frequency accuracy
4.7 Earphone coupler
4.8 The rms response
4.9 Averaging time constant for noise measurement
4.10 Current measurement
20 5 Standard conditions
5.1 Ambient conditions
5.2 Operating conditions
25 6 Recommended measurements, specifications and tolerances
6.1 Curves
6.2 OSPL90 curve
6.3 HFA-OSPL90
26 6.4 Full-on gain
6.5 HFA full-on gain (HFA-FOG
6.6 Adjustment of the gain control to the reference test setting (RTS
6.7 Reference test gain (RTG
27 6.8 Frequency response curve
6.9 Frequency range
6.10 Tolerance method for frequency response curve
28 6.11 Harmonic distortion
29 6.12 Equivalent input noise level (EIN
30 6.13 Battery current
6.14 Induction coil response
33 6.15 Interpretation of tolerances
34 Annex A (Informative) Equivalent substitution method
A.1 Introduction
A.2 Purpose
A.3 Application
A.4 Special equipment
A.5 Procedure
37 Annex B (Informative) Recommended voltage and resistance values to be used in battery
simulators
B.1 Introduction
B.2 Battery simulator characteristics
38 Annex C (Informative) Guidelines for additional optional tests to characterize hearing aids
C.1 Characteristics of the gain control
C.2 Characterization of battery current as a function of quiescent current and maximum
current
39 C.3 Effect of tone-control setting on frequency response
C.4 Effect of output limiting control setting on OSPL90 and full-on frequency response
40 C.5 Effect of gain control setting on frequency response
C.6 Effect of power supply voltage variation on acoustic gain and OSPL90
C.7 Effect of power supply impedance variation on acoustic gain and OSPL90
41 C.8 Hearing aid output noise spectrum
44 C.9 AGC hearing aids
46 C.10 Total harmonic distortion in acoustic mode as a function of input SPL
47 C.11 Total harmonic distortion in acoustic mode as a function of frequency
48 C.12 Maximum induction coil sensitivity measurement
C.13 Total harmonic distortion for induction coil mode as a function of input magnetic field
strength
49 C.14 Difference frequency distortion
52 Bibliography

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ASA S3.22 2014
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