SN EN 60118-4 : 1998 AMD 1 1998现行
HEARING AIDS - PART 4: MAGNETIC FIELD STRENGTH IN AUDIO-FREQUENCY INDUCTION LOOPS FOR HEARING AID PURPOSES
出版：Swiss Standards
专家解读视频
Applies 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.
BS EN 60118-4 : 2006 - Identical
I.S. EN 60118-4:2015 - Identical
DIN EN 60118-4 : 2015 - Identical
UNE EN 60118-4 : 2016 - Identical
DIN EN 60118-4 : 2015 - Identical
