Electroacoustics. Hearing aids - Induction-loop systems for hearing aid purposes. System performance requirements1 Scope This part of IEC 60118 is applicable 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 (telecoil). Throughout this standard, it is assumed that the hearing aids used with it conform to all relevant parts of IEC 60118. This standard specifies requirements for the field strength in audio frequency

Deletion of the reference to EU Directive 80/778/EEC of July

The standard also specifies the minimum frequency response requirements for acceptable intelligibility

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These rules may be applied to non-standardized steel

the cable will meet the performance requirements laid down

nor applicable to the construction of the machinery

There is no guarantee that adequate load exists for regenerative braking trains

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BS ISO 2332:2009 Agricultural tractors and machinery

ISO 2746 on vitreous and porcelain enamel testing is useful for:

Metal fabrication industries

BS 3987 also covers guidance on properties affecting coating performance