AS/NZS 61786.1:2021
Measurement of DC magnetic, AC magnetic and AC electric fields from 1 Hz to 100 kHz with regard to exposure of human beings, Part 1: Requirements for measuring instruments
Standard adopts IEC 617861:2013 with modifications for Australia and New Zealand, which 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. KEYWORDS: Measuring instruments; Exposure levels; Human body; Quasi‐static magnetic fields; Electric fields
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AS/NZS 61786.1:2021 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 (IEC 61786-1:2013 (ED.1.0) MOD)
English
CONTENTS
FOREWORD
1 Scope
2 Normative references
3 Terms and definitions
3.1 Meters
3.2 Meter characteristics
3.3 Field characteristics
3.4 Measurements
4 Symbols
5 Instrumentation specifications
5.1 General
5.2 Measurement uncertainty
5.3 Magnitude range
5.4 Pass-band
5.5 Operating temperature and humidity ranges
5.6 Power supplies
5.7 Readability of scale
5.8 Instrument dimensions and choice of probe
5.8.1 General schema
5.8.2 Magnetic field meter
5.8.3 Electric field meter
5.8.4 Support for electric field meter
5.9 Electromagnetic compatibility
5.9.1 Immunity
5.9.2 Emissions
5.10 Crest factor
5.11 Durability
5.12 Weight
5.13 Instrumentation choice
6 Calibration
6.1 General
6.2 Calibration procedure
6.2.1 General
6.2.2 Magnetic field calibration system
6.2.3 Electric field calibration system
6.2.4 Three-axis probes calibration
6.2.5 Calibration values
6.2.6 Calibration uncertainty
6.3 Calibration documentation
7 Verification
Annex A (normative) Calibration methods
Annex B (informative) Example of calibration uncertainty
Annex C (informative) General characteristics of magnetic and electric fields
Annex D (informative) Magnetic flux density meters (magnetic field meters)
Annex E (informative) Electric field strength meters (electric field meters)
Annex F (informative) Influence of humidity on electric field measurement
Annex G (informative) Units
Bibliography
Figures
Figure€1 – Schema of a field meter
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)
Figure A.1 – Deviation in percentage departure of calculated axial field [7]
Figure A.2 – Coordinate system and geometry of rectangular loopof many turns of wire (see Equation (A. 1))
Figure A.3 – Circular Helmholtz coils
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
Figure A.6 – Diagram for voltage injection technique
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
Figure A.8 – Parallel plates system for calibrating free-body electric field meters
Figure A.9 – Arrangement with parallel plates orientated perpendicular to the floor
Figure A.10 – Diagram for current injection technique
Figure C.1 – Oscillating and rotating field quantities for cases of elliptical polarization, linear polarization, and circular polarization
Figure C.2 – Magnetic field from current in straight and circular conductors
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)
Figure D.1 – Schematic view of simple magnetic field meter with coil-type probe
Figure D.2 – Approximate equivalent circuit of a coil probe when connected to the detector
Figure E.1 – Single-axis free-body meter geometries
Figure E.2 – Designs for flat plate probes used with ground-referenced electric field meters
Figure F.1 – Test in the climatic chamber with the normal tripod (left) and the offset tripod (right) (photograph EDF R&D)
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
Tables
Table 1 – Mains terminal disturbance voltage limits for class B group 1 equipment measured on a test site
Table A.1 – Calculated normalized electric field values midway between plates and at plate surfaces
Table B.1 – Example of uncertainty calculation
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AS/NZS 61786.1:2021 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 (IEC 61786-1:2013 (ED.1.0) MOD)
English
CONTENTS
FOREWORD
1 Scope
2 Normative references
3 Terms and definitions
3.1 Meters
3.2 Meter characteristics
3.3 Field characteristics
3.4 Measurements
4 Symbols
5 Instrumentation specifications
5.1 General
5.2 Measurement uncertainty
5.3 Magnitude range
5.4 Pass-band
5.5 Operating temperature and humidity ranges
5.6 Power supplies
5.7 Readability of scale
5.8 Instrument dimensions and choice of probe
5.8.1 General schema
5.8.2 Magnetic field meter
5.8.3 Electric field meter
5.8.4 Support for electric field meter
5.9 Electromagnetic compatibility
5.9.1 Immunity
5.9.2 Emissions
5.10 Crest factor
5.11 Durability
5.12 Weight
5.13 Instrumentation choice
6 Calibration
6.1 General
6.2 Calibration procedure
6.2.1 General
6.2.2 Magnetic field calibration system
6.2.3 Electric field calibration system
6.2.4 Three-axis probes calibration
6.2.5 Calibration values
6.2.6 Calibration uncertainty
6.3 Calibration documentation
7 Verification
Annex A (normative) Calibration methods
Annex B (informative) Example of calibration uncertainty
Annex C (informative) General characteristics of magnetic and electric fields
Annex D (informative) Magnetic flux density meters (magnetic field meters)
Annex E (informative) Electric field strength meters (electric field meters)
Annex F (informative) Influence of humidity on electric field measurement
Annex G (informative) Units
Bibliography
Figures
Figure€1 – Schema of a field meter
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)
Figure A.1 – Deviation in percentage departure of calculated axial field [7]
Figure A.2 – Coordinate system and geometry of rectangular loopof many turns of wire (see Equation (A. 1))
Figure A.3 – Circular Helmholtz coils
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
Figure A.6 – Diagram for voltage injection technique
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
Figure A.8 – Parallel plates system for calibrating free-body electric field meters
Figure A.9 – Arrangement with parallel plates orientated perpendicular to the floor
Figure A.10 – Diagram for current injection technique
Figure C.1 – Oscillating and rotating field quantities for cases of elliptical polarization, linear polarization, and circular polarization
Figure C.2 – Magnetic field from current in straight and circular conductors
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)
Figure D.1 – Schematic view of simple magnetic field meter with coil-type probe
Figure D.2 – Approximate equivalent circuit of a coil probe when connected to the detector
Figure E.1 – Single-axis free-body meter geometries
Figure E.2 – Designs for flat plate probes used with ground-referenced electric field meters
Figure F.1 – Test in the climatic chamber with the normal tripod (left) and the offset tripod (right) (photograph EDF R&D)
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
Tables
Table 1 – Mains terminal disturbance voltage limits for class B group 1 equipment measured on a test site
Table A.1 – Calculated normalized electric field values midway between plates and at plate surfaces
Table B.1 – Example of uncertainty calculation
AS/NZS 61786.1:2021
Online Library subscription information
Online library subscriptions provide a cost-effective solution for organisations of any size to access the latest standards, offering 24/7 access to a personalised catalogue. The service ensures subscribers have have the most up-to-date version of selected standards, incluing automatic updates for any amendments or versions. Pricing is dependent on the chosen standards and the number of concurrent users, with discounts applied from the standards PDF price. For customised subscriptions or further inquiries, contact the Online Library team.