I.S. EN IEC 60118-4:2015&A1:2018
Current
The latest, up-to-date edition.
Electroacoustics - Hearing aids - Part 4: Induction-loop systems for hearing aid purposes - System performance requirements (IEC 60118-4:2014/A1:2017)
Hardcopy , PDF
English - French
22-11-2019
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FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 General loop system system pressure level at the microphone
5 Using components of a sound system in an induction-loop system
6 Meters and test signals
7 Magnetic background noise level of the installation site
8 Characteristics to be specified, methods of measurement and requirements
9 Small-volume systems
10 Setting up (commissioning) the system
Annex A (informative) Systems for small useful magnetic field volumes counters, etc
Annex B (informative) Measuring equipment
Annex C (informative) Provision of information
Annex D (informative) Measuring speech signals
Annex E (informative) Basic theory and practice of audio-frequency induction-loop systems
Annex F (informative) Effects of metal in the building structure on the magnetic field
Annex G (informative) Calibration of field-strength meters
Annex H (informative) Effect of the aspect ratio of the loop on the magnetic field strength
Annex I (informative) Overspill of magnetic field from an induction-loop system
Bibliography
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