BS EN 61786-1:2014
$198.66
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
| Published By | Publication Date | Number of Pages |
| BSI | 2014 | 56 |
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.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 6 | English CONTENTS |
| 8 | 1 Scope 2 Normative references |
| 9 | 3 Terms and definitions 3.1 Meters |
| 10 | 3.2 Meter characteristics |
| 11 | 3.3 Field characteristics |
| 12 | 3.4 Measurements |
| 13 | 4 Symbols |
| 14 | 5 Instrumentation specifications 5.1 General 5.2 Measurement uncertainty |
| 15 | 5.3 Magnitude range 5.4 Pass-band 5.5 Operating temperature and humidity ranges 5.6 Power supplies |
| 16 | 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 1 – Schema of a field meter |
| 17 | 5.8.3 Electric field meter 5.8.4 Support for electric field meter 5.9 Electromagnetic compatibility 5.9.1 Immunity Figure 2 – Insulating tripod and offset rod for an electric field probe (photograph RTE) Figure 3 – Electric field measurement using a hand-held stick (photograph RTE) |
| 18 | 5.9.2 Emissions |
| 19 | 5.10 Crest factor 5.11 Durability 5.12 Weight Tables Table 1 – Mains terminal disturbance voltage limits for class B group 1 equipment measured on a test site |
| 20 | 5.13 Instrumentation choice 6 Calibration 6.1 General 6.2 Calibration procedure 6.2.1 General 6.2.2 Magnetic field calibration system |
| 21 | 6.2.3 Electric field calibration system 6.2.4 Three-axis probes calibration 6.2.5 Calibration values |
| 22 | 6.2.6 Calibration uncertainty 6.3 Calibration documentation |
| 23 | 7 Verification |
| 24 | Annex A (normative) Calibration methods Figure A.1 – Deviation in percentage departure of calculated axial field [7] |
| 25 | Figure A.2 – Coordinate system and geometry of rectangular loopof many turns of wire (see Equation (A. 1)) |
| 26 | Figure A.3 – Circular Helmholtz coils |
| 27 | Figure A.4 – Deviation in percentage of calculated Bz from centre value (see Equation (A.4)) Figure A.5 – Schematic view of a circuit for calibration of magnetic field meter using a square loop to produce a known field |
| 29 | Figure A.6 – Diagram for voltage injection technique |
| 30 | Figure A.7 – Calculated normalized electric field at plate surfaces and midway between plates as a function of the normalized distance from the edge of the plate |
| 32 | Figure A.8 – Parallel plates system for calibrating free-body electric field meters Table A.1 – Calculated normalized electric field values midway between plates and at plate surfaces |
| 33 | Figure A.9 – Arrangement with parallel plates orientated perpendicular to the floor |
| 34 | Figure A.10 – Diagram for current injection technique |
| 35 | Annex B (informative) Example of calibration uncertainty Table B.1 – Example of uncertainty calculation |
| 37 | Annex C (informative) General characteristics of magnetic and electric fields |
| 38 | Figure C.1 – Oscillating and rotating field quantities for cases of elliptical polarization, linear polarization, and circular polarization |
| 39 | Figure C.2 – Magnetic field from current in straight and circular conductors |
| 40 | Figure C.3 – Perturbation of electric field distribution by a person (from IEC 62226-3-1) Figure C.4 – Proximity effect with a 25 kV line and a building (from IEC 62110) |
| 41 | Annex D (informative) Magnetic flux density meters (magnetic field meters) Figure D.1 – Schematic view of simple magnetic field meter with coil-type probe |
| 43 | Figure D.2 – Approximate equivalent circuit of a coil probe when connected to the detector |
| 45 | Annex E (informative) Electric field strength meters (electric field meters) |
| 46 | Figure E.1 – Single-axis free-body meter geometries |
| 47 | Figure E.2 – Designs for flat plate probes used with ground-referenced electric field meters |
| 49 | Annex F (informative) Influence of humidity on electric field measurement Figure F.1 – Test in the climatic chamber with the normal tripod (left) and the offset tripod (right) (photograph EDF R&D) |
| 50 | Figure F.2 – E field measured as a function of the humidity with a normal tripod Figure F.3 – E field measured as a function of the humidity with an offset tripod |
| 51 | Annex G (informative) Units |
| 52 | Bibliography |
