IEC 61786-1:2013 provides guidance for measuring instruments used to measure the field strength of quasi-static magnetic and electric fields that have a frequency content in the range 1 Hz to 100 kHz and with DC magnetic fields to evaluate the exposure levels of the human body to these fields. Sources of fields include devices that operate at power frequencies and produce power frequency and power frequency harmonic fields, as well as devices that produce fields within the frequency range of this document, including devices that produce static fields, and the earth’s static magnetic field. The magnitude ranges covered by this standard are 0,1 ?T to 200 mT in AC (1 ?T to 10 T in DC) and 1 V\/m to 50 kV\/m for magnetic fields and electric fields, respectively. When measurements outside this range are performed, most of the provisions of this standard will still apply, but special attention should be paid to specified uncertainty and calibration procedures. The first editions of IEC 61786-1 and IEC 61786-2 replace IEC 61786:1998. Part 1 deals with measuring instruments, and Part 2 deals with measurement procedures. The content of the standard was revised in order to give up-to-date and practical information to the user.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 6<\/td>\n | English CONTENTS <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | 1 Scope 2 Normative references <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 3 Terms and definitions 3.1 Meters <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 3.2 Meter characteristics <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 3.3 Field characteristics <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 3.4 Measurements <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 4 Symbols <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 5 Instrumentation specifications 5.1 General 5.2 Measurement uncertainty <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 5.3 Magnitude range 5.4 Pass-band 5.5 Operating temperature and humidity ranges 5.6 Power supplies <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 5.7 Readability of scale 5.8 Instrument dimensions and choice of probe 5.8.1 General schema 5.8.2 Magnetic field meter Figures Figure\u00a01 \u2013 Schema of a field meter <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 5.8.3 Electric field meter 5.8.4 Support for electric field meter 5.9 Electromagnetic compatibility 5.9.1 Immunity Figure 2 \u2013 Insulating tripod and offset rod for an electric field probe (photograph RTE) Figure 3 \u2013 Electric field measurement using a hand-held stick (photograph RTE) <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 5.9.2 Emissions <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 5.10 Crest factor 5.11 Durability 5.12 Weight Tables Table 1 \u2013 Mains terminal disturbance voltage limits for class B group 1 equipment measured on a test site <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 5.13 Instrumentation choice 6 Calibration 6.1 General 6.2 Calibration procedure 6.2.1 General 6.2.2 Magnetic field calibration system <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | 6.2.3 Electric field calibration system 6.2.4 Three-axis probes calibration 6.2.5 Calibration values <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | 6.2.6 Calibration uncertainty 6.3 Calibration documentation <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | 7 Verification <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | Annex A (normative) Calibration methods Figure A.1 \u2013 Deviation in percentage departure of calculated axial field [7] <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | Figure A.2 \u2013 Coordinate system and geometry of rectangular loopof many turns of wire (see Equation (A. 1)) <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | Figure A.3 \u2013 Circular Helmholtz coils <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | Figure A.4 \u2013 Deviation in percentage of calculated Bz from centre value (see Equation (A.4)) Figure A.5 \u2013 Schematic view of a circuit for calibration of magnetic field meter using a square loop to produce a known field <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | Figure A.6 \u2013 Diagram for voltage injection technique <\/td>\n<\/tr>\n | ||||||
| 30<\/td>\n | Figure A.7 \u2013 Calculated normalized electric field at plate surfaces and midway between plates as a function of the normalized distance from the edge of the plate <\/td>\n<\/tr>\n | ||||||
| 32<\/td>\n | Figure A.8 \u2013 Parallel plates system for calibrating free-body electric field meters Table A.1 \u2013 Calculated normalized electric field values midway between plates and at plate surfaces <\/td>\n<\/tr>\n | ||||||
| 33<\/td>\n | Figure A.9 \u2013 Arrangement with parallel plates orientated perpendicular to the floor <\/td>\n<\/tr>\n | ||||||
| 34<\/td>\n | Figure A.10 \u2013 Diagram for current injection technique <\/td>\n<\/tr>\n | ||||||
| 35<\/td>\n | Annex B (informative) Example of calibration uncertainty Table B.1 \u2013 Example of uncertainty calculation <\/td>\n<\/tr>\n | ||||||
| 37<\/td>\n | Annex C (informative) General characteristics of magnetic and electric fields <\/td>\n<\/tr>\n | ||||||
| 38<\/td>\n | Figure C.1 \u2013 Oscillating and rotating field quantities for cases of elliptical polarization, linear polarization, and circular polarization <\/td>\n<\/tr>\n | ||||||
| 39<\/td>\n | Figure C.2 \u2013 Magnetic field from current in straight and circular conductors <\/td>\n<\/tr>\n | ||||||
| 40<\/td>\n | Figure C.3 \u2013 Perturbation of electric field distribution by a person (from IEC\u00a062226-3-1) Figure C.4 \u2013 Proximity effect with a 25 kV line and a building (from IEC\u00a062110) <\/td>\n<\/tr>\n | ||||||
| 41<\/td>\n | Annex D (informative) Magnetic flux density meters (magnetic field meters) Figure D.1 \u2013 Schematic view of simple magnetic field meter with coil-type probe <\/td>\n<\/tr>\n | ||||||
| 43<\/td>\n | Figure D.2 \u2013 Approximate equivalent circuit of a coil probe when connected to the detector <\/td>\n<\/tr>\n | ||||||
| 45<\/td>\n | Annex E (informative) Electric field strength meters (electric field meters) <\/td>\n<\/tr>\n | ||||||
| 46<\/td>\n | Figure E.1 \u2013 Single-axis free-body meter geometries <\/td>\n<\/tr>\n | ||||||
| 47<\/td>\n | Figure E.2 \u2013 Designs for flat plate probes used with ground-referenced electric field meters <\/td>\n<\/tr>\n | ||||||
| 49<\/td>\n | Annex F (informative) Influence of humidity on electric field measurement Figure F.1 \u2013 Test in the climatic chamber with the normal tripod (left) and the offset tripod (right) (photograph EDF R&D) <\/td>\n<\/tr>\n | ||||||
| 50<\/td>\n | Figure F.2 \u2013 E field measured as a function of the humidity with a normal tripod Figure F.3 \u2013 E field measured as a function of the humidity with an offset tripod <\/td>\n<\/tr>\n | ||||||
| 51<\/td>\n | Annex G (informative) Units <\/td>\n<\/tr>\n | ||||||
| 52<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Measurement of DC magnetic, AC magnetic and AC electric fields from 1 Hz to 100 kHz with regard to exposure of human beings – Requirements for measuring instruments<\/b><\/p>\n |