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IEC 60118-4:1981

IEC 60118-4:1981

Methods of measurement of electro-acoustical characteristis of hearing aids. Part 4: Magnetic field strength in audio-frequency induction loops for hearing aid purposes

Méthodes de mesure des caractéristiques électroacoustiques des appareils de correction auditive. Quatrième partie: Intensité du champ magnétique dans les boucles d'induction audiofréquences utilisées à des fins de correction auditive

Fecha:
2006-10-27 /Anulada
Resumen (inglés):
Applies to audio-frequency induction loop systems producing an alternating magnetic field and intended to provide an input signal for hearing aids operating with an induction pick-up coil. Specifies a standard value of magnetic field strength in audio-frequency induction loops for hearing aid purposes, such as will give an adequate signal-to-noise ratio without overloading the hearing aid.
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