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
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.
SDO:
IEC
Language:
English
ICS Codes:
17.140.50
Status:
Revised
Publish date:
1980-12-31
Standard Number:
IEC 60118-4:1981