DIN IEC 60118-4 : 1991被替代
HEARING AIDS; MAGNETIC FIELD STRENGTH IN AUDIO FREQUENCY INDUCTION LOOPS FOR HEARING AID PURPOSES
出版：German Institute for Standardisation (Deutsches Institut für Normung)
专家解读视频
Applies to audio frequency induction loop system 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.
IEC 60118-4 : 3.1 - Similar to
HD 450.4 : 200S1 - Corresponds
HD 450.4 : 200S1 - Identical
