This part of IEC 62489 applies to audio-frequency induction-loop systems for assisted hearing. It may also be applied to such systems used for other purposes, as far as it is applicable. The standard is intended for assessment of human exposure to low-frequency magnetic fields produced by the system, by calculation and by in-situ testing.<\/p>\n
This standard does not deal with other aspects of safety, for which IEC 60065 applies, or with EMC.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 6<\/td>\n | English \n CONTENTS <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | 1 Scope 2 Normative references 3 Rated values <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | 4 Situation regarding current standards 5 Configurations of loops 5.1 Main types of configuration 5.2 General considerations 5.3 Large-area loops <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 5.4 Medium-area loops 5.5 Small-area loops 5.6 Solenoid antennas Figures \n Figure 1 \u2013 An earhook induction transducer, with a BTE (behind the ear) hearing aid body for scale <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 6 Calculations 6.1 General 6.2 Solenoid antennas 7 Measurements 7.1 General 7.2 Input signal <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 7.3 Measuring instrument 8 Comparison of calculated or measured results with guidelines or limits <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 9 Meeting limits or guidelines 10 Measurement uncertainty Figure 2 \u2013 K factor as a function of least distance between wire and disc <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | Annex A (informative) Rationale for this product-family magnetic field emission standard for audio-frequency induction-loop systems (AFILS) in the context of human exposure to non-ionizi \nng radiation Figure A.1 \u2013 ICNIRP magnetic field reference levels <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | Table A.1 \u2013 Extract from IEC\u00a062311, Table A.1 \u2013 Characteristics and parameters of the equipment to be considered, with the application to AFILS added <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | Annex B (informative) \nExample calculation using the coupling factor K <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Electroacoustics. Audio-frequency induction loop systems for assisted hearing – Methods of calculating and measuring the low-frequency magnetic field emissions from the loop for assessing conformity with guidelines on limits for human exposure<\/b><\/p>\n |