BS 7594:2011

Foreword
Section 1: General
1 Scope
2 Normative references
3 Terms, definitions, signs and symbols
4 General
Section 2: Purchasing an AFILS, placing a contract
           for its installation, or obtaining independent
           assessment of the performance of an installation
5 Technical advice
6 Objective of the system
7 Choosing the system supplier
8 Contractual provisions
9 Factors to be considered at the design stage
Section 3: AFILS system design
10 Classification of systems
11 Signal sources
12 Objective measurement of intelligibility
13 Safety and reliability considerations
Section 4: Installing an AFILS
14 Responsibility of the installer
15 Installation practices and workmanship
16 Inspection and testing of wiring
17 Commissioning
18 Documentation
19 Certification
20 Acceptance
21 Verification
Section 5: Operation and maintenance
22 General
23 Routine testing
24 Inspection and servicing
25 Non-routine attention
Section 6: User responsibilities
26 Responsible person
27 Logbook
Section 7: System components
28 AFILS amplifiers
29 Loops
Annexes
Annex A (normative) - Induction-loop monitor
        receivers
Annex B (informative) - What is an audio-frequency
        induction-loop system (AFILS) and how does
        it work?
Annex C (informative) - Explanations of the basis of
        the design equations given in Section 3
Annex D (informative) - Model certificates
Annex E (informative) - Explanation of the specification
        and measurement of magnetic field strength of
        induction-loop systems
Annex F (normative) - Specification of the PPM-based
        field strength meter
Annex G (informative) - Magnetic field direction near
        the loop conductor
Bibliography

Provides recommendations for and guidance on the design, planning, installation, testing, operation and maintenance of an audio frequency induction loop system (AFILS) intended for communicating speech, music and/or other signals.

This British Standard gives recommendations for and guidance on the design, planning, installation, testing, operation and maintenance of an audio frequency induction loop system (AFILS) intended for communicating speech, music and/or other signals. It is mainly concerned with AFILS for hearing enhancement, in which the signals are communicated to users of hearing aids equipped with magnetic pick-up coils. However, most of the standard also applies to AFILS used for other purposes, and some additional information on these purposes is given in Section3.

This standard does not apply to induction-loop systems which use a carrier frequency, nor to other systems for hearing enhancement purposes which do not use magnetic induction.