National foreword
Committees responsible
Specification
1 Scope
2 Object
3 General
4 Marking of control settings
5 Miscellaneous markings and indications
6 Markings on hearing aid insert earphones
7 Markings on bone conduction vibrators for hearing
aids
Figures
1 Example of markings around the output nipple of an
insert earphone
2 Example of frequency response curve of a N-type
earphone
3 Example of frequency response curve of a P-type
earphone
4 Example of frequency response curve of a W-type
earphone