Measurement of DC magnetic fields, AC magnetic and electric fields from 1 Hz to 100 kHz with regard to exposure of human beings - Requirements for instruments

EN IEC 61786-1 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 μT to 200 mT in AC (1 μT 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. Specifically, this standard - defines terminology; - identifies requirements on field meter specifications; - indicates methods of calibration; - defines requirements on instrumentation uncertainty; - describes general characteristics of fields; - describes operational principles of instrumentation. Sources of uncertainty during calibration are also identified. In regard to electric field measurements, this standard considers only the measurement of the unperturbed electric field strength at a point in free space (i.e. the electric field prior to the introduction of the field meter and operator) or above conducting surfaces. This horizontal standard is primarily intended for use by technical committees in the preparation of standards in accordance with the principles laid down in IEC Guide 108. One of the responsibilities of a technical committee is, wherever applicable, to make use of horizontal standards in the preparation of its publications. The contents of this horizontal standard will not apply unless specifically referred to or included in the relevant publications.

/

Mesure de champs magnétiques continus et de champs magnétiques et électriques alternatifs dans la plage de fréquences de 1 Hz à 100 kHz dans leur rapport à l'exposition humaine - Exigences applicables aux instruments

L'IEC 61786-1:2013 comporte des lignes directrices concernant les instruments de mesure utilisés pour la mesure des valeurs des champs magnétiques et électriques quasi-statiques avec des composantes fréquentielles comprises entre 1 Hz et 100 kHz ainsi que des champs magnétiques continus, permettant d'évaluer les niveaux d'exposition du corps humain à ces champs. Parmi les sources de champs figurent des dispositifs qui fonctionnent aux fréquences industrielles et qui produisent des champs à ces fréquences et aux fréquences harmoniques, ainsi que des dispositifs qui produisent des champs dans la plage de fréquence de ce document, incluant les dispositifs qui produisent des champs statiques, et le champ magnétique statique terrestre. Les plages d'amplitudes couvertes par la présente norme vont respectivement de 0,1 μT à 200 mT en alternatif (1 μT à 10 T en continu) et de 1 V/m à 50 kV/m pour les champs magnétiques et les champs électriques. Lorsque des mesures sont effectuées en dehors de cette plage, la plupart des dispositions de la présente norme restent applicables, mais il convient de prêter une attention toute particulière à l'incertitude et à la procédure d'étalonnage spécifiées. Les premières éditions de la IEC 61786-1 et la IEC 61786-2 remplacent la CEI 61786:1998. La Partie 1 concerne les instruments de mesure, et la Partie 2 concerne les procédures de mesure. Le contenu de la norme a été révisé afin de donner à l'utilisateur des informations à jour et pratiques.

Meritve enosmernih magnetnih polj, izmeničnih magnetnih in električnih polj v območju od 1 Hz do 100 kHz z vidika izpostavljenosti ljudi - Zahteve za instrumente (IEC 61786-1:2013)

Standard EN IEC 61786-1 podaja smernice za merilne inštrumente za merjenje jakosti polja pri navidezno statičnih magnetnih in električnih poljih, katerih frekvenčni delež je v razponu od 1 Hz do 100 kHz, in pri enosmernih magnetnih poljih, s čimer se ovrednoti ravni izpostavljenosti človeškega telesa tem poljem. Viri polj zajemajo tako naprave, ki delujejo na obratovalnih frekvencah ter proizvajajo obratovalne frekvence in harmonična polja obratovalnih frekvenc, kot tudi naprave, ki polja proizvajajo v frekvenčnem razponu tega dokumenta, vključno z napravami, ki proizvajajo statična polja, in zemeljskim statičnim magnetnim poljem. Razponi velikosti, ki jih zajema ta standard, so pri izmeničnih električnih poljih od 0,1 μT do 200 mT (1 μT do 10 T pri enosmernih) in 1 V/m do 50 kV/m pri magnetnih poljih. Če je meritev zunaj tega razpona, se večina določil iz tega standarda še vedno uporablja, vendar je treba posebno pozornost posvetiti določenim postopkom negotovosti in kalibriranja. Ta standard namreč – določa terminologijo, – določa zahteve za specifikacije za merilnike polja, – določa metode kalibriranja, – določa zahteve za negotovost instrumentov, – opisuje splošne značilnosti polj, – opisuje načela delovanja instrumentov. Določa tudi vire negotovosti med kalibriranjem. Ta standard z vidika merjenja električnega polja upošteva le merjenje nespremenjene jakosti električnega polja v točki na prostem (tj. električno polje pred uvedbo merilnika in meritelja) ali nad prevodno površino. Ta horizontalni standard je namenjen predvsem tehničnim odborom za pripravo standardov v skladu z načeli vodila IEC Guide 108. Ena od pristojnosti tehničnih odborov je, da med pripravo publikacij uporabljajo horizontalne standarde, kadar je to primerno. Vsebina tega horizontalnega standarda se ne uporablja, razen če je izrecno navedena ali zajeta v ustreznih publikacijah

General Information

Status
Published
Publication Date
29-May-2014
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
13-May-2014
Due Date
18-Jul-2014
Completion Date
30-May-2014

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SLOVENSKI STANDARD
SIST EN 61786-1:2014
01-julij-2014
0HULWYHHQRVPHUQLKPDJQHWQLKSROML]PHQLþQLKPDJQHWQLKLQHOHNWULþQLKSROMY
REPRþMXRG+]GRN+]]YLGLNDL]SRVWDYOMHQRVWLOMXGL=DKWHYH]D
LQVWUXPHQWH ,(&

Measurement of DC magnetic fields, AC magnetic and electric fields from 1 Hz to 100

kHz with regard to exposure of human beings - Requirements for instruments
Mesure de champs magnétiques continus et de champs magnétiques et électriques
alternatifs dans la plage de fréquences de 1 Hz à 100 kHz dans leur rapport à
l'exposition humaine - Exigences applicables aux instruments
Ta slovenski standard je istoveten z: EN 61786-1:2014
ICS:
17.220.20 0HUMHQMHHOHNWULþQLKLQ Measurement of electrical
PDJQHWQLKYHOLþLQ and magnetic quantities
SIST EN 61786-1:2014 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 61786-1:2014
---------------------- Page: 2 ----------------------
SIST EN 61786-1:2014
EUROPEAN STANDARD
EN 61786-1
NORME EUROPÉENNE
March 2014
EUROPÄISCHE NORM
ICS 17.220.20
English version
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
(IEC 61786-1:2013)
Mesure de champs magnétiques continus Messung von magnetischen Gleichfeldern
et de champs magnétiques et électriques und von elektrischen und magnetischen

alternatifs dans la plage de fréquences de Wechselfeldern von 1 Hz bis 100 kHz im

1 Hz à 100 kHz dans leur rapport à Hinblick auf die Exposition von Personen -
l'exposition humaine - Teil 1: Anforderungen an Messgeräte
Partie 1: Exigences applicables aux (IEC 61786-1:2013)
instruments de mesure
(CEI 61786-1:2013)

This European Standard was approved by CENELEC on 2014-01-16. CENELEC members are bound to comply

with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard

the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on

application to the CEN-CENELEC Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other

language made by translation under the responsibility of a CENELEC member into its own language and notified

to the CEN-CENELEC Management Centre has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,

the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany,

Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland,

Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2014 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 61786-1:2014 E
---------------------- Page: 3 ----------------------
SIST EN 61786-1:2014
EN 61786-1:2014 - 2 -
Foreword

The text of document 106/292/FDIS, future edition 1 of IEC 61786-1, prepared by IEC TC 106, Methods

for the assessment of electric, magnetic and electromagnetic fields associated with human exposure" was

submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 61786-1:2014.

The following dates are fixed:
• latest date by which the document has (dop) 2014-10-16
to be implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2017-01-16
• latest date by which the national
standards conflicting with the
document have to be withdrawn

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent

rights.
Endorsement notice

The text of the International Standard IEC 61786-1:2013 was approved by CENELEC as a European

Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards indicated:

IEC 62110:2009 NOTE Harmonised as EN 62110:2009 (not modified).
ISO 80000-1:2009 NOTE Harmonised as EN ISO 80000-1:2013 (not modified).
ISO/IEC 17025:2005 NOTE Harmonised as EN ISO/IEC 17025:2005 (not modified).
---------------------- Page: 4 ----------------------
SIST EN 61786-1:2014
- 3 - EN 61786-1:2014
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD

applies.
Publication Year Title EN/HD Year
IEC 61000-3-2 - Electromagnetic compatibility (EMC) - EN 61000-3-2 -
Part 3-2: Limits - Limits for harmonic current
emissions (equipment input current <= 16 A
per phase)
IEC 61000-4-2 - Electromagnetic compatibility (EMC) - EN 61000-4-2 -
Part 4-2: Testing and measurement
techniques - Electrostatic discharge immunity
test
IEC 61000-4-3 - Electromagnetic compatibility (EMC) - EN 61000-4-3 -
Part 4-3: Testing and measurement
techniques - Radiated, radio-frequency,
electromagnetic field immunity test
IEC 61000-4-4 - Electromagnetic compatibility (EMC) - EN 61000-4-4 -
Part 4-4: Testing and measurement
techniques - Electrical fast transient/burst
immunity test
IEC 61000-4-6 - Electromagnetic compatibility (EMC) - EN 61000-4-6 -
Part 4-6: Testing and measurement
techniques - Immunity to conducted
disturbances, induced by radio-frequency
fields
IEC 61000-4-8 - Electromagnetic compatibility (EMC) - EN 61000-4-8 -
Part 4-8: Testing and measurement
techniques - Power frequency magnetic field
immunity test
CISPR 11 (mod) - Industrial, scientific and medical equipment - EN 55011 -
Radio-frequency disturbance characteristics -
Limits and methods of measurement
ISO/IEC Guide 98-3 - Uncertainty of measurement - - -
Part 3: Guide to the expression of uncertainty
in measurement (GUM:1995)
IEC Guide 108 - Guidelines for ensuring the coherency of IEC - -
publications - Application of horizontal
standards
---------------------- Page: 5 ----------------------
SIST EN 61786-1:2014
---------------------- Page: 6 ----------------------
SIST EN 61786-1:2014
IEC 61786-1
Edition 1.0 2013-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
HORIZONTAL STANDARD
NORME HORIZONTALE
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
Mesure de champs magnétiques continus et de champs magnétiques et
électriques alternatifs dans la plage de fréquences de 1 Hz à 100 kHz dans
leur rapport à l'exposition humaine –
Partie 1: Exigences applicables aux instruments de mesure
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX XA
ICS 17.220.20 ISBN 978-2-8322-1298-1

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 7 ----------------------
SIST EN 61786-1:2014
– 2 – 61786-1 © IEC:2013
CONTENTS

FOREWORD ........................................................................................................................... 4

1 Scope .............................................................................................................................. 6

2 Normative references ...................................................................................................... 6

3 Terms and definitions ...................................................................................................... 7

3.1 Meters ............................................................................................................... 7

3.2 Meter characteristics .......................................................................................... 8

3.3 Field characteristics ........................................................................................... 9

3.4 Measurements ................................................................................................. 10

4 Symbols ........................................................................................................................ 11

5 Instrumentation specifications ....................................................................................... 12

5.1 General ............................................................................................................ 12

5.2 Measurement uncertainty ................................................................................. 12

5.3 Magnitude range .............................................................................................. 13

5.4 Pass-band ....................................................................................................... 13

5.5 Operating temperature and humidity ranges ..................................................... 13

5.6 Power supplies ................................................................................................ 13

5.7 Readability of scale .......................................................................................... 14

5.8 Instrument dimensions and choice of probe ..................................................... 14

5.8.1 General schema ............................................................................. 14

5.8.2 Magnetic field meter ....................................................................... 14

5.8.3 Electric field meter .......................................................................... 15

5.8.4 Support for electric field meter ........................................................ 15

5.9 Electromagnetic compatibility ........................................................................... 15

5.9.1 Immunity ......................................................................................... 15

5.9.2 Emissions ....................................................................................... 16

5.10 Crest factor ...................................................................................................... 17

5.11 Durability ......................................................................................................... 17

5.12 Weight ............................................................................................................. 17

5.13 Instrumentation choice ..................................................................................... 18

6 Calibration ..................................................................................................................... 18

6.1 General ............................................................................................................ 18

6.2 Calibration procedure ....................................................................................... 18

6.2.1 General .......................................................................................... 18

6.2.2 Magnetic field calibration system .................................................... 18

6.2.3 Electric field calibration system ....................................................... 19

6.2.4 Three-axis probes calibration .......................................................... 19

6.2.5 Calibration values ........................................................................... 19

6.2.6 Calibration uncertainty .................................................................... 20

6.3 Calibration documentation ............................................................................... 20

7 Verification .................................................................................................................... 21

Annex A (normative) Calibration methods ............................................................................ 22

Annex B (informative) Example of calibration uncertainty ..................................................... 33

Annex C (informative) General characteristics of magnetic and electric fields ...................... 35

Annex D (informative) Magnetic flux density meters (magnetic field meters) ........................ 39

---------------------- Page: 8 ----------------------
SIST EN 61786-1:2014
61786-1 © IEC:2013 – 3 –

Annex E (informative) Electric field strength meters (electric field meters) ........................... 43

Annex F (informative) Influence of humidity on electric field measurement ........................... 47

Annex G (informative) Units ................................................................................................. 49

Bibliography .......................................................................................................................... 50

Figure 1 – Schema of a field meter ....................................................................................... 14

Figure 2 – Insulating tripod and offset rod for an electric field probe (photograph RTE) ......... 15

Figure 3 – Electric field measurement using a hand-held stick (photograph RTE).................. 15

Figure A.1 – Deviation in percentage departure of calculated axial field [7] ........................... 22

Figure A.2 – Coordinate system and geometry of rectangular loop of many turns of

wire (see Equation (A. 1)) ..................................................................................................... 23

Figure A.3 – Circular Helmholtz coils .................................................................................... 24

Figure A.4 – Deviation in percentage of calculated B from centre value (see Equation

(A.4)) .................................................................................................................................... 25

Figure A.5 – Schematic view of a circuit for calibration of magnetic field meter using a

square loop to produce a known field .................................................................................... 25

Figure A.6 – Diagram for voltage injection technique ............................................................ 27

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 ............................ 28

Figure A.8 – Parallel plates system for calibrating free-body electric field meters ................. 30

Figure A.9 – Arrangement with parallel plates orientated perpendicular to the floor ............... 31

Figure A.10 – Diagram for current injection technique ........................................................... 32

Figure C.1 – Oscillating and rotating field quantities for cases of elliptical polarization,

linear polarization, and circular polarization .......................................................................... 36

Figure C.2 – Magnetic field from current in straight and circular conductors .......................... 37

Figure C.3 – Perturbation of electric field distribution by a person (from IEC 62226-3-1) ....... 38

Figure C.4 – Proximity effect with a 25 kV line and a building (from IEC 62110) .................... 38

Figure D.1 – Schematic view of simple magnetic field meter with coil-type probe .................. 39

Figure D.2 – Approximate equivalent circuit of a coil probe when connected to the

detector ................................................................................................................................ 41

Figure E.1 – Single-axis free-body meter geometries ............................................................ 44

Figure E.2 – Designs for flat plate probes used with ground-referenced electric field

meters .................................................................................................................................. 45

Figure F.1 – Test in the climatic chamber with the normal tripod (left) and the offset

tripod (right) (photograph EDF R&D) ..................................................................................... 47

Figure F.2 – E field measured as a function of the humidity with a normal tripod ................... 48

Figure F.3 – E field measured as a function of the humidity with an offset tripod ................... 48

Table 1 – Mains terminal disturbance voltage limits for class B group 1 equipment

measured on a test site ......................................................................................................... 17

Table A.1 – Calculated normalized electric field values midway between plates and at

plate surfaces ....................................................................................................................... 30

Table B.1 – Example of uncertainty calculation ..................................................................... 33

---------------------- Page: 9 ----------------------
SIST EN 61786-1:2014
– 4 – 61786-1 © IEC:2013
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
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
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested

in the subject dealt with may participate in this preparatory work. International, governmental and non-

governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 61786-1 has been prepared by IEC technical committee 106:

Methods for the assessment of electric, magnetic and electromagnetic fields associated with

human exposure.

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.

It has the status of a horizontal standard in accordance with IEC Guide 108.
---------------------- Page: 10 ----------------------
SIST EN 61786-1:2014
61786-1 © IEC:2013 – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
106/292/FDIS 106/298/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts of the IEC 61786 series, published under the general title Measurement of

DC magnetic fields and AC magnetic and electric fields from 1 Hz to 100 kHz with regard to

exposure of human beings, can be found on the IEC website.

The committee has decided that the contents of this publication will remain unchanged until

the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data

related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct

understanding of its contents. Users should therefore print this document using a

colour printer.
---------------------- Page: 11 ----------------------
SIST EN 61786-1:2014
– 6 – 61786-1 © IEC:2013
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
1 Scope

This part of IEC 61786 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 μT to

200 mT in AC (1 μT 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.
Specifically, this standard
– defines terminology;
– identifies requirements on field meter specifications;
– indicates methods of calibration;
– defines requirements on instrumentation uncertainty;
– describes general characteristics of fields;
– describes operational principles of instrumentation.

NOTE Measurement methods that achieve defined goals pertaining to assessment of human exposure are

described in IEC 61786-2

Sources of uncertainty during calibration are also identified. In regard to electric field

measurements, this standard considers only the measurement of the unperturbed electric field

strength at a point in free space (i.e. the electric field prior to the introduction of the field

meter and operator) or above conducting surfaces.

This horizontal standard is primarily intended for use by technical committees in the

preparation of standards in accordance with the principles laid down in IEC Guide 108.

One of the responsibilities of a technical committee is, wherever applicable, to make use of

horizontal standards in the preparation of its publications. The contents of this horizontal

standard will not apply unless specifically referred to or included in the relevant publications.

2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and

are indispensable for its application. For dated references, only the edition cited applies. For

---------------------- Page: 12 ----------------------
SIST EN 61786-1:2014
61786-1 © IEC:2013 – 7 –
undated references, the latest edition of the referenced document (including any
amendments) applies.

IEC 61000-3-2, Electromagnetic compatibility (EMC) – Part 3-2: Limits – Limits for harmonic

current emissions (equipment input current ≤ 16 A per phase)

IEC 61000-4-2, Electromagnetic compatibility (EMC) – Part 4-2: Testing and measurement

techniques – Electrostatic discharge immunity test

IEC 61000-4-3, Electromagnetic compatibility (EMC) - Part 4-3 : Testing and measurement

techniques - Radiated, radio-frequency, electromagnetic field immunity test

IEC 61000-4-4, Electromagnetic compatibility (EMC) – Part 4-4: Testing and measurement

techniques – Electrical fast transient/burst immunity test

IEC 61000-4-6, Electromagnetic compatibility (EMC) – Part 4-6: Testing and measurement

techniques – Immunity to conducted disturbances, induced by radio-frequency fields

IEC 61000-4-8, Electromagnetic compatibility (EMC) – Part 4-8: Testing and measurement

techniques – Power frequency magnetic field immunity test

CISPR 11, Industrial, scientific and medical equipment – Radio-frequency disturbance

characteristics – Limits and methods of measurement

ISO/IEC Guide 98-3, Uncertainty of measurement – Part 3: Guide to the expression of

uncertainty in measurement (GUM:1995)

Guide 108, Guidelines for ensuring the coherency of IEC publications – Application of

horizontal standards
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
NOTE 1 Internationally accepted SI-units are used throughout the standard.
NOTE 2 For other units, see Annex G.

NOTE 3 Throughout this standard, the words "magnetic flux density" and "magnetic field" will be considered

synonymous.
3.1 Meters
3.1.1
measuring instrument
device intended to be used to make measurements, alone or in conjunction with
supplementary devices
[SOURCE: IEC 60050-300:2001, 311-03-01]
3.1.2
field meter
meter designed to measure electric, magnetic and electromagnetic fields

Note 1 to entry: Field meters usually consist of three parts: the probe, the detector circuit and the display.

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SIST EN 61786-1:2014
– 8 – 61786-1 © IEC:2013
3.1.3
probe

input device of a measuring instrument, generally made as a separate unit and connected to it

by means of a flexible cable, which transmits the measurand in a suitable form
Note 1 to entry: A probe can be composed of one or several sensors.

[SOURCE: IEC 60050-300:2001, 313-09-11, modified – a note to entry has been added.]

3.1.4
detector

device for discerning the existence or variations of waves, oscillations or signals, usually for

extracting information conveyed.
EXAMPLES Peak detector, rms detector
[SOURCE: IEC 60050-702:1992, 702-09-39, modified – the examples are different.]
3.1.5
free-body meter

meter that measures the unperturbed electric field strength at a point above the ground and is

supported in space without conductive contact to ground
3.1.6
fluxgate magnetometer

instrument designed to measure magnetic fields by making use of the non-linear magnetic

characteristics of a probe or sensing element that has a ferromagnetic core
3.1.7
ground reference meter

meter that measures the electric field at or close to the surface of the ground, frequently

implemented by measuring the induced
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