EUROLAB, with its state-of-the-art accredited laboratories and expert team, provides precise and fast testing services within the scope of IEC EN 60118-4 testing. This part of IEC EN 60118 is applicable to audio frequency induction loop systems that generate an alternating magnetic field at audio frequencies and are intended to provide an input signal for hearing aids powered by an induction pickup coil (telecoil). Throughout this standard, hearing aids used with it are assumed to comply with all relevant parts of IEC 60118.
This standard specifies the requirements for field strength in sound frequency induction loops for hearing aid purposes that will give an adequate signal-to-noise ratio without overloading the hearing aid. The standard also specifies minimum frequency response requirements for acceptable intelligibility.
Methods for measuring magnetic field strength are specified and information is provided on appropriate measuring equipment, information that should be provided to the operator and users of the system, and other important considerations.
This standard does not specify requirements for field strength produced by equipment such as loop driver amplifiers or associated microphone or audio signal sources, or telephone handsets covered by ITU-TP, as discussed in IEC EN 62489-1.
Transmitting an audio frequency signal through an induction loop system can generally provide an acceptable signal-to-noise ratio in conditions where a purely acoustic transmission would be significantly impaired by reverberation and background noise.
One form of audio-frequency induction-loop system usually involves a cable run in a loop around a room or area where a group of hearing-impaired people want to listen. The cable is connected to a microphone system via an amplifier, or to a radio receiver, CD player, etc. connects to another audio signal source, such as The design and application of the induction loop is determined by the construction of the building in which it is installed, especially with the presence of large quantities of iron, steel or aluminum in the structure. In addition, the layout and location of electrical wiring and equipment can create high levels of background audio frequency magnetic fields that can interfere with the reception of the loop signal.
EUROLAB assists manufacturers with IEC EN 60118-4 test compliance. Our test experts, with their professional working mission and principles, provide you, our manufacturers and suppliers, the best service and controlled testing process in our laboratories. Thanks to these services, businesses receive more effective, high-performance and quality testing services and provide safe, fast and uninterrupted service to their customers.
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