Assistive Listening Knowledge Base
  • International standard (public catalogue)

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

From https://assistivelisteningknowledgebase.org/evidence/iec-60118-4-1981/ · record checked 13 October 2026

  • IEC TC 29
  • International Electrotechnical Commission

Standards body (International Electrotechnical Commission)

Summary

The first edition of the IEC hearing-loop field-strength standard, retained in the catalogue with a withdrawal date.

Key findings

  • The catalogue identifies edition 1.0 and gives 1 January 1981 as its publication date. This record conservatively uses year precision because an independent day-level publication date was not established.
  • The abstract describes a standard magnetic field strength for audio-frequency loops feeding hearing-aid induction coils, intended to provide sufficient signal relative to noise without overloading the hearing aid.
  • The catalogue gives 27 October 2006 as the withdrawal date.

Limits

Catalogue and abstract only; the paid nine-page text was not read. No numerical field-strength value or comparison of requirements with later editions is inferred.

Read the original

webstore.iec.ch/en/publication/13426

Link checked . We link to the original and do not host copies.

Cited in

No question cites this source yet.

Cite this source

IEC TC 29. 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. International Electrotechnical Commission. 1981. https://webstore.iec.ch/en/publication/13426 (accessed 13 October 2026).

The accessed date is when this library last checked the link; use the date you read it. To point readers to this summary instead, link to https://assistivelisteningknowledgebase.org/evidence/iec-60118-4-1981/

Every finding here cites its source, and who funded each source is labelled. This site does not recommend products. Found an error or a missing study? Suggest a correction.