CEI EN 60118-4 : 2016

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 General
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
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
Annex ZA (normative) - Normative references to international
         publications with their corresponding European
         publications

Pertains to audio-frequency induction-loop systems producing an alternating magnetic field at audio frequencies and intended to provide an input signal for hearing aids operating with an induction pick-up coil (telecoil).