Measurement procedures of magnetic field levels generated by electronic and electrical equipment in the automotive environment with respect to human exposure - Part 1: Low frequency magnetic fields

IEC TS 62764-1:2019(E) applies to the assessment of human exposure to low frequency magnetic fields generated by automotive vehicles. For plug-in vehicles, this includes the electric vehicle supply equipment (EVSE) and associated cables provided by the car manufacturer.
The scope of this document establishes the measurement procedure for the evaluation of magnetic field levels in the automotive environment, for passenger cars and commercial vehicles of categories M1 and N1 as defined in ECE/TRANS/WP.29/78/Rev.3 [1] , with respect to human exposure. It provides standardized operating conditions and defines recommended measurements to assess compliance to the applicable exposure requirements.
This document covers the frequency range 1 Hz to 400 kHz and is applicable to any type of engine and/or internal energy source.
It is not the scope of this document to define procedures for wireless power transfer (WPT). Human exposure due to WPT is covered by IEC 61980-1 [2].
Abnormal operation of the vehicle or equipment under test is not taken into consideration.
Key Words:Human Exposure, Low Frequency Magnetic Fields, Electric vehicle Supply Equipment

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Status
Published
Publication Date
12-Sep-2019
Current Stage
PPUB - Publication issued
Completion Date
13-Sep-2019
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IEC TS 62764-1
Edition 1.0 2019-09
TECHNICAL
SPECIFICATION
colour
inside
Measurement procedures of magnetic field levels generated by electronic and
electrical equipment in the automotive environment with respect to human
exposure –
Part 1: Low frequency magnetic fields
IEC TS 62764-1:2019-09(en)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC TS 62764-1
Edition 1.0 2019-09
TECHNICAL
SPECIFICATION
colour
inside
Measurement procedures of magnetic field levels generated by electronic and
electrical equipment in the automotive environment with respect to human
exposure –
Part 1: Low frequency magnetic fields
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 17.220.20 ISBN 978-2-8322-7248-0

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

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC TS 62764-1:2019 © IEC 2019
CONTENTS

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

INTRODUCTION ..................................................................................................................... 6

1 Scope .............................................................................................................................. 7

2 Normative references ...................................................................................................... 7

3 Terms, definitions and abbreviated terms ........................................................................ 7

3.1 Terms and definitions .............................................................................................. 7

3.2 Abbreviated terms ................................................................................................... 8

4 Measurement procedure .................................................................................................. 8

4.1 Measurement phases .............................................................................................. 8

4.2 Measuring conditions .............................................................................................. 8

4.3 Test site .................................................................................................................. 9

4.4 Vehicle set-up ......................................................................................................... 9

4.5 Measurement locations ........................................................................................... 9

4.5.1 General ........................................................................................................... 9

4.5.2 Inside the vehicle ............................................................................................. 9

4.5.3 Outside the vehicle ........................................................................................ 10

5 Measurement technique ................................................................................................ 11

5.1 Measuring equipment ............................................................................................ 11

5.2 Measurement of the magnetic field exposure ........................................................ 11

6 Measurement procedure ................................................................................................ 11

6.1 Vehicle in stationary mode .................................................................................... 11

6.1.1 General ......................................................................................................... 11

6.1.2 Flowchart ....................................................................................................... 11

6.1.3 Phase 1: vehicle preparation ......................................................................... 12

6.1.4 Phase 2: vehicle set-up ................................................................................. 12

6.1.5 Phase 3: vehicle measurement ...................................................................... 12

6.2 Vehicle in driving mode ......................................................................................... 13

6.2.1 General ......................................................................................................... 13

6.2.2 Flowchart ....................................................................................................... 13

6.2.3 Phase 1: vehicle preparation ......................................................................... 13

6.2.4 Phase 2: vehicle set-up ................................................................................. 13

6.2.5 Phase 3: vehicle measurement (at constant speed) ....................................... 13

6.2.6 Phase 4: optional measurements ................................................................... 14

6.3 Vehicle in acceleration mode ................................................................................ 14

6.3.1 General ......................................................................................................... 14

6.3.2 Flowchart ....................................................................................................... 14

6.3.3 Phase 1: vehicle preparation ......................................................................... 14

6.3.4 Phase 2: vehicle set-up ................................................................................. 14

6.3.5 Phase 3: vehicle measurement (in acceleration) ............................................ 14

6.4 Vehicle in plug-in charging mode .......................................................................... 15

6.4.1 General ......................................................................................................... 15

6.4.2 Flowchart ....................................................................................................... 15

6.4.3 Phase 1: vehicle preparation ......................................................................... 15

6.4.4 Phase 2: vehicle set-up ................................................................................. 16

6.4.5 Phase 3: vehicle measurement ...................................................................... 16

7 Test report ..................................................................................................................... 16

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IEC TS 62764-1:2019 © IEC 2019 – 3 –

8 Assessment ................................................................................................................... 16

Annex A (informative) Practical measurement advice ........................................................... 17

A.1 Motivation ............................................................................................................. 17

A.2 Measurement adaptor ........................................................................................... 17

Annex B (informative) Maximum extents of measurement volumes inside the vehicle .......... 18

B.1 Motivation ............................................................................................................. 18

B.2 Anthropometrical information ................................................................................ 18

B.3 Maximum extents of measurement volumes .......................................................... 19

Bibliography .......................................................................................................................... 20

Figure 1 – Example of test volumes taking account of all body parts for a left-hand

drive vehicle ......................................................................................................................... 10

Figure 2 – Specific stationary mode set-up and test .............................................................. 12

Figure 3 – Specific driving mode set-up and test ................................................................... 13

Figure 4 – Specific acceleration mode set-up and test .......................................................... 14

Figure 5 – Specific plug-in charging mode set-up and test .................................................... 15

Figure 6 – Plug-in charging supply cable positioning ............................................................. 16

Figure A.1 – Disc spacer around two types of measurement probes ...................................... 17

Figure A.2 – Hemispherical spacer around two types of measurement probes ...................... 17

Figure B.1 – Summary of relevant anthropometrical data ...................................................... 18

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– 4 – IEC TS 62764-1:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MEASUREMENT PROCEDURES OF MAGNETIC FIELD LEVELS
GENERATED BY ELECTRONIC AND ELECTRICAL EQUIPMENT IN THE
AUTOMOTIVE ENVIRONMENT WITH RESPECT TO HUMAN EXPOSURE –
Part 1: Low frequency magnetic fields
FOREWORD

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Technical Specifications are subject to review within three years of publication to decide

whether they can be transformed into International Standards.

IEC TS 62764-1, which is a Technical Specification, has been prepared by IEC technical

committee 106: Methods for the assessment of electric, magnetic and electromagnetic fields

associated with human exposure.
---------------------- Page: 6 ----------------------
IEC TS 62764-1:2019 © IEC 2019 – 5 –
The text of this Technical Specification is based on the following documents:
Draft TS Report on voting
106/477/DTS 106/493/RVDTS

Full information on the voting for the approval of this Technical Specification can be found in

the report on voting indicated in the above table.

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

A list of all parts in the IEC 62764 series, published under the general title Measurement

procedures of magnetic field levels generated by electronic and electrical equipment in the

automotive environment with respect to human exposure, can be found on the IEC website.

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

maintenance result 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.
A bilingual version of this publication may be issued at a later date.

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.

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– 6 – IEC TS 62764-1:2019 © IEC 2019
INTRODUCTION

This document specifies a methodology for determining the exposure to multiple magnetic field

sources for passenger cars and light commercial vehicles including standardized operating

conditions and measurement volumes and/or surfaces.
---------------------- Page: 8 ----------------------
IEC TS 62764-1:2019 © IEC 2019 – 7 –
MEASUREMENT PROCEDURES OF MAGNETIC FIELD LEVELS
GENERATED BY ELECTRONIC AND ELECTRICAL EQUIPMENT IN THE
AUTOMOTIVE ENVIRONMENT WITH RESPECT TO HUMAN EXPOSURE –
Part 1: Low frequency magnetic fields
1 Scope

This part of IEC 62764 applies to the assessment of human exposure to low frequency magnetic

fields generated by automotive vehicles. For plug-in vehicles, this includes the electric vehicle

supply equipment (EVSE) and associated cables provided by the car manufacturer.

The scope of this document establishes the measurement procedure for the evaluation of

magnetic field levels in the automotive environment, for passenger cars and commercial

vehicles of categories M1 and N1 as defined in ECE/TRANS/WP.29/78/Rev.3 [1] , with respect

to human exposure. It provides standardized operating conditions and defines recommended

measurements to assess compliance to the applicable exposure requirements.

This document covers the frequency range 1 Hz to 400 kHz and is applicable to any type of

engine and/or internal energy source.

It is not the scope of this document to define procedures for wireless power transfer (WPT).

Human exposure due to WPT is covered by IEC 61980-1 [2].

Abnormal operation of the vehicle or equipment under test is not taken into consideration.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies.

For undated references, the latest edition of the referenced document (including any

amendments) applies.

IEC 61786-1:2013, 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

IEC 62311:2019, Assessment of electronic and electrical equipment related to human exposure

restrictions for electromagnetic fields (0 Hz to 300 GHz)
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
____________
Numbers in square brackets refer to the Bibliography.
---------------------- Page: 9 ----------------------
– 8 – IEC TS 62764-1:2019 © IEC 2019
3.1.1
applicable requirement

particular requirement regarding human exposure to low-frequency magnetic fields against

which the vehicle under test is to be assessed using the methods outlined in this document

Note 1 to entry: Examples of such requirements can be found in [3] to [9].
3.1.2
magnetic field exposure

specific metric(s) that are used to quantify human exposure to low-frequency magnetic fields in

the applicable requirements
Note 1 to entry: Examples of such metrics can be found in [3] to [9].
3.1.3
powertrain
main system that generates power and delivers it to the road surface
3.2 Abbreviated terms
EV electric vehicle
EVSE electric vehicle supply equipment
HEV hybrid electric vehicle, including mild hybrid electric vehicle (MHEV)
ICEV internal combustion engine vehicle
SOC state of charge indicated to the driver
WPT wireless power transfer
4 Measurement procedure
4.1 Measurement phases

The measurement procedure is divided into four parts regarding the operational vehicle use:

1) vehicle in stationary mode;
2) vehicle in driving mode;
3) vehicle in acceleration mode;
4) vehicle in plug-in charging mode.
These four parts are described in detail in Clause 6.
4.2 Measuring conditions

The measurements cover only sources of persistent magnetic field exposure. Continuous

occurring sources, or repetitive transient sources such as fan, wipers are included. Transient

electrical functions of short duration activated occasionally by the driver, passengers or the

vehicle itself are not considered in this document, in particular the horn, the motorized mirror

and the door-lock motor.

NOTE The rotation of the tyres can produce low-frequency magnetic fields (typically below 50 Hz, depending on

the speed of the vehicle) in and surrounding the vehicle, due to the static magnetization of the tyres [10][11]. This

can only contribute to measurements inside the vehicle (since no measurements are to be performed around the

vehicle in dynamic mode).

The measurements are performed in the vehicle’s standard modes of operation, generating the

expected highest levels of magnetic field exposure in measuring volumes that are
representative of the occupant (Annex B) and bystander locations.
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IEC TS 62764-1:2019 © IEC 2019 – 9 –
4.3 Test site

Measurements shall be performed in an area having ambient magnetic field exposure values of

less than 10 % of the values given in the requirements in the measurement volumes.

The ambient magnetic field exposure shall be measured with or without the vehicle under test,

but in conditions that are representative of the vehicle test. This measurement can be performed

before each test or periodically in accordance with the laboratory’s quality management

processes.

A dynamometer (or roller bench) may be used if it rotates all the driven wheels of the vehicle.

It shall be set to simulate the outdoor dynamics of the vehicle including at least its steady-state

torque in driving mode and its inertial mass during acceleration mode.

If an outdoor track is used, the grade of the portion used for the tests shall be in the range ±2 %.

NOTE In the case of a dynamometer, the ambient magnetic field exposure can depend on the torque and/or speed

of the dynamometer.
4.4 Vehicle set-up

The following configuration is recommended within the passenger compartment, where

practicable:

– all seats except the rearmost seats, if adjustable, centre-positioned horizontally and at the

lowest position vertically;
– the rearmost seats, if horizontally adjustable, in their rearmost position;
– the headrests in the fully-back position;

– all seat backs except for the rearmost seats, if adjustable, approximately 15° back from the

vertical;
– all seat backs of the rearmost seats, if adjustable, fully tilted backwards;
– the steering wheel centre-positioned vertically and horizontally.

Details of the configuration actually applied during the measurements shall be indicated in the

test report, highlighting any deviations from the recommended settings outlined above.

4.5 Measurement locations
4.5.1 General

Measurements are performed in all regions of the vehicle that are accessible by the driver and

passengers, and in the immediate vicinity of the vehicle for bystanders. These include the driver

and passenger area (cabin), the cargo storage area, the engine and/or the electric powertrain

areas, and the areas around the outside of the vehicle.

The measurement distance between the surface of any part of the vehicle and the centre of the

probe shall be 0,20 m (see Annex A).
4.5.2 Inside the vehicle

Measurements shall be performed throughout the volumes accessible in normal vehicle use

cases by parts of the human body to which the applicable exposure requirements apply. For

example, in the passenger compartment, occupants are assumed to be seated in positions

where restraint systems are provided.

Measurements are not required where the components are mounted (no components or parts

have to be removed to perform the measurements).
---------------------- Page: 11 ----------------------
– 10 – IEC TS 62764-1:2019 © IEC 2019

An example of test volumes taking account of all body parts is illustrated in Figure 1.

Figure 1 – Example of test volumes taking account of all body parts
for a left-hand drive vehicle
In the example shown in Figure 1, the following apply.

– For individual seats, the occupants are represented by three volumes corresponding to

(A) the feet, (B) the legs, and (C) the trunk and head. For bench seats, the occupants are

represented by three common volumes: D, E and F.

– The volume G represents the arms and hands on the steering wheel (which can be on either

or both the left-hand side and right-hand side of the vehicle, or in the centre).

– Measurements can also have to be performed over the engine and/or the electric powertrain

in H and/or I only in stationary and charging modes and if people are permitted to access

these areas while the engine is running and/or the electric powertrain is active. The bottom

of H can be a smooth envelope above all contained components.

Volumes B, C, E and F could also take into account the positions of babies and infants.

NOTE These test volumes are examples defined with consideration of all body parts (including potential exposure

of extremities in volumes A, D, G, H and I), but it is possible that some standards or regulations do not apply to the

whole body.

Measurement in the areas of the driver's position can be achieved by different means including

the use of a dynamometer. Appropriate safety measures shall be employed to avoid accidents

due to operation of the dynamometer during measurements.
4.5.3 Outside the vehicle

Measurements shall be performed around the outside of the vehicle in all areas accessible to

parts of the human body identified in the applicable requirements. Details of the areas shall be

indicated in the test report.
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IEC TS 62764-1:2019 © IEC 2019 – 11 –
5 Measurement technique
5.1 Measuring equipment

The measuring equipment shall include a probe covering the frequency range defined in

Clause 1. The probe shall comply with the requirements of IEC 61786-1.

NOTE For measurements outside the range 1 Hz to 100 kHz, the provisions of IEC 61786-1 can still apply with

appropriate calibration in the range 100 kHz to 400 kHz.
The area of the probe shall be at most 100 cm .

The complete measurement chain shall be verified to validate its performance and accuracy

before each measurement programme.
5.2 Measurement of the magnetic field exposure

For each volume, the measurement of the magnetic field exposure shall be performed in two

steps:

1) an initial scan of the entire volume to determine the location of the maximum magnetic field

exposure;
2) a final measurement at the location of the maximum magnetic field exposure.

To scan the measurement volumes, the probe shall be moved sufficiently slowly to ensure that

the spatial maximum is correctly located, especially when measuring sources between

1 Hz and 10 Hz.

The position of the probe relative to the vehicle structure shall remain constant during the final

measurement.
6 Measurement procedure
6.1 Vehicle in stationary mode
6.1.1 General
In this step, measurements are performed with the vehicle under test stationary.

For ICEVs, EVs and HEVs, these measurements are not required if all the relevant vehicle

functions can be tested simultaneously in driving mode.
6.1.2 Flowchart
The overall procedure is split into three phases as shown in Figure 2.
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– 12 – IEC TS 62764-1:2019 © IEC 2019
Figure 2 – Specific stationary mode set-up and test
6.1.3 Phase 1: vehicle preparation
The following conditions shall be applied.
– For ICEVs: idle (engine running).
– For EVs: ready to drive.
– For HEVs: ready to drive and/or idle (engine running).

– Vehicle parking brake enabled only if all functions can still be activated, otherwise utilize

appropriate means to restrain the vehicle.
– Start/stop function (if present) disabled (with engine continuously running).
– Seats and steering wheel set as defined in 4.4.

– Front and rear openings of vehicle (e.g. cargo storage area, hood) closed except when

measuring in associated volumes (e.g. H or I).
6.1.4 Phase 2: vehicle set-up
– Switch on the items of electrical equipment that are considered in 4.2.
– Where a range of se
...

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