AS IEC 61669-2003

1 - AS IEC 61669-2003 ELECTROACOUSTICS-EQUIPMENT FOR THE MEASUREMENT FO REAL-EAR ACOUSTICAL CHARACTERISTICS OF HEARING AIDS
4 - PREFACE
5 - CONTENTS
7 - INTRODUCTION
9 - 1 Scope
9 - 2 Normative references
9 - 3 Terms and definitions
9 - 3.1 test signal
10 - 3.2 subject
10 - 3.3 subject reference point
10 - 3.4 test axis
10 - 3.5 working distance
10 - 3.6 sound pressure level (SPL)
10 - 3.7 band sound pressure level
10 - 3.8 test signal level
10 - 3.9 equalization
10 - 3.10 reference microphone controlling microphone
10 - 3.11 sound inlet
11 - 3.12 field reference point
11 - 3.13 probe microphone
11 - 3.14 test ear
11 - 3.15 measurement point
11 - 3.16 test signal type
11 - 3.17 concurrent equalization real time equalization
11 - 3.18 stored equalization
11 - 3.19 substitution method
11 - 3.20 modified pressure method
11 - 3.21 differential comparison
12 - 3.22 real-ear unaided response (REUR)
12 - 3.23 real-ear unaided gain (REUG)
12 - 3.24 real-ear occluded response (REOR)
12 - 3.25 real-ear occluded gain (REOG)
12 - 3.26 real-ear aided response (REAR)
12 - 3.27 real-ear aided gain (REAG)
12 - 3.28 real-ear insertion gain (REIG)
12 - 3.29 curve
13 - 3.30 crest factor
13 - 3.31 uncertainty of measurement
13 - 3.32 combined standard uncertainty of a measurement
13 - 3.33 expanded uncertainty of a measurement
13 - 3.34 coverage factor
13 - 4 Limitations
14 - 5 General requirements
14 - 5.1 General
14 - 5.2 Safety requirements
14 - 5.3 Warm-up time
14 - 5.4 Environmental conditions
14 - 5.5 Power supply variation
15 - 5.6 Immunity to power and radio frequency fields
15 - 5.7 Interface connections
15 - 6 Test signal characteristics
15 - 6.1 Test signal
15 - 6.2 Sound source
15 - 6.3 Test signal level
15 - 6.4 Test signal level indication
15 - 6.5 Equalization
16 - 6.6 Frequency
16 - 6.7 Harmonic distortion
16 - 6.8 Equipment for automatic sweep frequency recording
16 - 6.9 Integrity of test signal
16 - 7 Sound measurement
16 - 7.1 Probe microphone measurement
16 - 7.2 Noise floor of probe microphone measurement
16 - 7.3 Attenuation of probe microphone to external signals
17 - 8 Data acquisition, analysis and presentation
17 - 8.1 General
17 - 8.2 Output indication
17 - 8.3 Graphical printout
17 - 9 Calibration
17 - 10 Demonstration of conformity with specifications and test procedures
17 - 10.1 General
18 - 10.2 Environmental conditions and power supply variation
18 - 10.3 Immunity to power and radio frequency fields
18 - 10.4 Test signals
18 - 10.4.1 Signal accuracy
18 - 10.4.2 Accuracy of control
19 - 10.5 Sound measurement
19 - 10.5.1 Measurement accuracy
19 - 10.5.2 Noise floor of probe microphone measurement
19 - 10.5.3 Attenuation of probe microphone to external signals
19 - 11 Maximum permitted expanded uncertainty of measurements
20 - 12 Marking and instruction manual
20 - 12.1 Marking
20 - 12.2 Software version
20 - 12.3 Instruction manual
21 - Bibliography

Specifies the general requirements for test equipment designed for use in measuring the real-ear acoustical characteristics of hearing aids and describes the terminology used. This Standard is identical with and reproduced from IEC 61669:2001.

This International Standard specifies the general requirements for test equipment designedfor use in measuring the real-ear acoustical characteristics of hearing aids and describes theterminology used.The purpose of this International Standard is to ensure that measurements of real-ear acoustical characteristics of a hearing aid on a given human ear, performed with different test equipment which comply with this International Standard using methods described in ISO 12124, shall give substantially the same results.

First published as AS IEC 61669-2003.