Wearable electronic devices and technologies - Part 201-3: Electronic textile - Determination of electrical resistance of conductive textiles under simulated microclimate

IEC 63203-201-3:2021 specifies a test method for determination of the electrical resistance of conductive fabrics under simulated microclimate within clothing. The microclimate is the climate of the small air layer between the skin and clothing having a specific temperature and humidity. This test method can be applied to conductive fabrics including multilayer assemblies for use in clothing.

Technologies et dispositifs électroniques prêts-à-porter - Partie 201-3: Textile électronique - Détermination de la résistance électrique des textiles conducteurs sous microclimat simulé

L’IEC 63203-201-3:2021 spécifie une méthode d’essai pour la détermination de la résistance électrique des étoffes conductrices sous microclimat simulé dans les vêtements. Le microclimat est le climat de la fine couche d’air entre la peau et le vêtement qui présente une température et une humidité spécifiques. Cette méthode d’essai peut être appliquée aux étoffes conductrices, y compris aux assemblages multicouches qui sont utilisés dans les vêtements.

General Information

Status
Published
Publication Date
06-Apr-2021
Current Stage
PPUB - Publication issued
Completion Date
07-Apr-2021
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IEC 63203-201-3
Edition 1.0 2021-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Wearable electronic devices and technologies –
Part 201-3: Electronic textile – Determination of electrical resistance of
conductive textiles under simulated microclimate
Technologies et dispositifs électroniques prêts-à-porter –

Partie 201-3: Textile électronique – Détermination de la résistance électrique des

textiles conducteurs sous microclimat simulé
IEC 63203-201-3:2021-04(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 63203-201-3
Edition 1.0 2021-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Wearable electronic devices and technologies –
Part 201-3: Electronic textile – Determination of electrical resistance of
conductive textiles under simulated microclimate
Technologies et dispositifs électroniques prêts-à-porter –
Partie 201-3: Textile électronique – Détermination de la résistance électrique
des textiles conducteurs sous microclimat simulé
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 59.080.80 ISBN 978-2-8322-9640-0

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: 3 ----------------------
– 2 – IEC 63203-201-3:2021  IEC 2021
CONTENTS

FOREWORD ........................................................................................................................... 3

1 Scope .............................................................................................................................. 5

2 Normative references ...................................................................................................... 5

3 Terms and definitions ...................................................................................................... 5

4 Principle of test ............................................................................................................... 6

5 Test equipment ................................................................................................................ 6

5.1 Sweating guarded-hotplate ..................................................................................... 6

5.2 Device including temperature and humidity sensor with set-up of the four

electrode – four wire method ................................................................................... 6

5.3 Membranes ............................................................................................................. 7

5.4 Test enclosure of the sweating guarded-hotplate .................................................... 7

6 Test specimens ............................................................................................................... 8

6.1 Number of test specimens ....................................................................................... 8

6.2 Dimension of specimens ......................................................................................... 9

6.3 Conditioning ............................................................................................................ 9

7 Test procedure ................................................................................................................ 9

7.1 Preparation of textile-based electrically conductive track contact points for

necessary measurement stability ............................................................................ 9

7.2 Specimen mounting on measuring unit .................................................................... 9

7.3 Determination of the apparatus constant R and measurement of water-
et0_al

vapour resistance including air layer R and RH) ................................................ 9

et_al

7.4 Determination of linear electrical resistance ............................................................ 9

8 Test report ..................................................................................................................... 10

Annex A (informative) Example of test results .................................................................... 11

A.1 Sample ................................................................................................................. 11

A.2 R , RH and R .................................................................................................. 11

et_al L

Bibliography .......................................................................................................................... 13

Figure 1 – Sweating guarded-hotplate ..................................................................................... 7

Figure 2 – Device including temperature and humidity sensor with set-up of four

electrode – four wire method ................................................................................................... 8

Figure 3 – Example of textile-based electrically conductive track ............................................ 8

Figure A.1 – Conductive fabric .............................................................................................. 11

Table A.1 – Arithmetic mean and CV % of test results .......................................................... 12

---------------------- Page: 4 ----------------------
IEC 63203-201-3:2021  IEC 2021 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
WEARABLE ELECTRONIC DEVICES AND TECHNOLOGIES –
Part 201-3: Electronic textile – Determination of electrical resistance
of conductive textiles under simulated microclimate
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

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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 63203-201-3 has been prepared by IEC technical committee 124:

Wearable electronic devices and technologies.
The text of this International Standard is based on the following documents:
FDIS Report on voting
124/136/FDIS 124/142/RVD

Full information on the voting for the approval of this International Standard 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 63203 series, published under the general title Wearable electronic

devices and technologies, can be found on the IEC website.
---------------------- Page: 5 ----------------------
– 4 – IEC 63203-201-3:2021  IEC 2021

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

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 6 ----------------------
IEC 63203-201-3:2021  IEC 2021 – 5 –
WEARABLE ELECTRONIC DEVICES AND TECHNOLOGIES –
Part 201-3: Electronic textile – Determination of electrical resistance
of conductive textiles under simulated microclimate
1 Scope

This part of IEC 63203-201 specifies a test method for determination of the electrical resistance

of conductive fabrics under simulated microclimate within clothing. The microclimate is the

climate of the small air layer between the skin and clothing having a specific temperature and

humidity. This test method can be applied to conductive fabrics including multilayer assemblies

for use in clothing.
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.
ISO 139, Textiles – Standard atmospheres for conditioning and testing

ISO 11092:2014, Textiles – Physiological effects – Measurement of thermal and water-vapour

resistance under steady-state conditions (sweating guarded-hotplate test)

ISO 21232:2018, Textiles – Determination of moisturizing effect of textile materials by

measurement of microclimate between textiles and simulated human skin using sweating

guarded hotplate

EN 16812:2016, Textiles and textile products – Electrically conductive textiles – Determination

of the linear electrical resistance of conductive tracks
3 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
3.1
textile-based electrically conductive track

electrically conductive part of the textile having a length (L) to width (W) ratio of minimum 10 to

[SOURCE: EN 16812:2016, 3.1, modified – Note 1 to entry has been deleted.]
---------------------- Page: 7 ----------------------
– 6 – IEC 63203-201-3:2021  IEC 2021
3.2
linear electrical resistance
electrical resistance per unit length of a track
Note 1 to entry: Linear electrical resistance is expressed in ohm per metre.
[SOURCE: EN 16812:2016, 3.3, modified – Note 1 to entry has been added.]
3.3
microclimate

climate of the small air layer (between the skin and the clothing or between textiles and sweating

guarded-hotplate)

Note 1 to entry: This microclimate has specific temperature and humidity characteristics. Simulated microclimate is

the climate of the air layer between fabric and sweating guarded-hotplate.

[SOURCE: ISO 21232:2018, 3.2, modified – A hyphen has been added to the term "sweating

guarded hotplate" and the second sentence in the note has been added.]
3.4
water-vapour resistance including air layer
et_al

water-vapour pressure difference between the two faces of a material (separated from each

other by 5 mm) divided by the resultant evaporative heat flux per unit area in the direction of

the gradient

Note 1 to entry: Water-vapour resistance is measured under the simulated state in which the air layer exists

between the skin and clothing.

Note 2 to entry: Water-vapour resistance including air layer is expressed in square metres pascal per watt.

[SOURCE: ISO 21232:2018, 3.3]
4 Principle of test

Clothing comfort depends on the environmental conditions (humidity, temperature) of the

microclimate between the skin and the fabrics when clothing is worn. The e-textile system made

of conductive fabrics is in direct contact with human skin so that the electrical resistance of

conductive fabrics is affected by the microclimate between human skin and fabric. Therefore,

this test method can perform the combined measurement of electrical resistance using the

measurement principle of the four-wire Kelvin method and a DC current source, under a

simulated microclimate.
5 Test equipment
5.1 Sweating guarded-hotplate

For the test device, the sweating guarded-hotplate (see Figure 1), specified in ISO 11092:2014,

is used. The upper part is a measuring unit with temperature and water supply control and the

lower part is a thermal guard with temperature control.
5.2 Device including temperature and humidity sensor with set-up of the four
electrode – four wire method

5.2.1 The device shall be made of electrically non-conductive material. The device is used

to create space for the air layer between hotplate and specimen. The sensor inside the device

measures the microclimate between hotplate and specimen, specified in ISO 21232:2018 (see

Figure 2).
---------------------- Page: 8 ----------------------
IEC 63203-201-3:2021  IEC 2021 – 7 –

5.2.2 An electrical current source, a voltage-meter and contacting electrodes measure

electrical resistance. Electrodes shall be arranged for using the set-up of the four electrode –

four wire method on the device and shall cover the whole width of the textile-based electrically

conductive track, specified in EN 16812:2016, 6.2 (see Figure 2 and Figure 3). The electrodes

shall be placed parallel to each other and they shall be movable forwards and backwards.

5.2.3 The specimen is fixed by magnets in the device. The diameter and thickness of the

magnet are (5,0 ± 0,2) mm and (3,0 ± 0,1) mm, respectively. The magnetic flux density shall be

higher than 0,3 T. The interval between magnets shall be less than 50 mm in the test device

(see Figure 2).
5.3 Membranes
A water-vapour permeable but liquid-water impermeable membrane shall meet the
requirements specified in ISO 11092:2014, 7.1.2.1 or in ISO 21232:2018, 5.4.
5.4 Test enclosure of the sweating guarded-hotplate
The requirements specified in ISO 11092:2014, 5.3 shall be met.
Key
1 water dosing device 4 measuring table
2 measuring unit 5 hotplate duct
3 thermal guard 6 air velocity sensor
Figure 1 – Sweating guarded-hotplate
---------------------- Page: 9 ----------------------
– 8 – IEC 63203-201-3:2021  IEC 2021
Key
1 upper frame
2 electrodes
3 lower frame
4 magnets for fixing specimens
5 grid
6 temperature and humidity sensor
Figure 2 – Device including temperature and humidity sensor
with set-up of four electrode – four wire method
[SOURCE: ISO 8388:1998, 3.1.2 and 3.5.2]
Figure 3 – Example of textile-based electrically conductive track
6 Test specimens
6.1 Number of test specimens

Test three specimens per sample and then calculate the arithmetic mean and the percentage

coefficient of variation (CV %). If the CV % is greater than 5 %, test two more specimens and

then calculate the arithmetic mean and the CV %.
___________
Reproduced (from ISO 8388:1998, 3.1.2 and 3.5.2), with the permission of ISO.
---------------------- Page: 10 ----------------------
IEC 63203-201-3:2021  IEC 2021 – 9 –
6.2 Dimension of specimens

The specimen shall be large enough to completely cover the surfaces of the measuring unit and

the thermal guard.
6.3 Conditioning

Before testing, condition the specimens for at least 24 h at (20 ± 2) °C and (65 ± 4) % relative

humidity (RH) in accordance with ISO 139.
7 Test procedure

7.1 Preparation of textile-based electrically conductive track contact points for

necessary measurement stability

The preparation of textile-based electrically conductive track points as defined in

EN 16812:2016 shall be applied.
7.2 Specimen mounting on measuring unit
7.2.1 Cover the measuring unit (5.1) with a membrane (5.3).

7.2.2 The specimen shall be flat and straight on the grid of lower frame. Fix the specimen

by using magnets between the lower and the upper frames of the device (5.2). Establish a tight

contact between the electrode and the textile-based electrically conductive track in order to

reduce contact resistance.

7.2.3 Place the specimen-mounted device on the covered measuring unit. The device shall

fit tightly into the measuring table.
7.3 Determination of the apparatus constant R and measurement of water-vapour
et0_al
resistance including air layer R and RH)
et_al

The R and RH measurement of the test specimen by the sweating guarded-hotplate shall

et_al

conform to testing conditions and procedures of ISO 21232:2018. See Annex A for an example

of test results.
7.4 Determination of linear electrical resistance
7.4.1 Determine the distance (d) between the voltage measurement electrodes (see
Figure 2).

7.4.2 Measurement of the linear electrical resistance shall conform to procedures of

EN 16812:2016. Apply a suitable current (I), and measure the resistance (R) continuously until

R reaches steady-state and R becomes stable.
et_al
7.4.3 The calculation of R of EN 16812:2016, 8.5.1 shall be followed.
7.4.4 Perform the same measurements for the other two specimens.

7.4.5 Calculate the arithmetic mean of R and the standard deviation for the sample, to three

significant digits. See Annex A for an example of test results.
---------------------- Page: 11 ----------------------
– 10 – IEC 63203-201-3:2021  IEC 2021
8 Test report
The test report shall include the following information:
a) the number and date of this document;
b) identification of the test lab;

c) identification of the sample and material including the direction of the track with respect to

the fabric structure, if applicable;
d) number of specimens;

e) type, manufacturer and specification of the equipment used (voltage meter and current

supply);
f) type of membrane used;
g) arithmetic mean and standard deviation for R and RH;
et_al
h) linear resistance R , in ohm per metre;
i) arithmetic mean per sample
j) standard deviation and CV % between specimens
k) any deviation from the specified procedure in this document;
l) date of test;
m) other remarks and observations.
---------------------- Page: 12 ----------------------
IEC 63203-201-3:2021  IEC 2021 – 11 –
Annex A
(informative)
Example of test results
A.1 Sample

A conductive fabric is made of the combination of conductive and non-conductive parts in the

weft direction as shown in Figure A.1. The structure, constituent yarns and physical properties

are as follows:
– structure: 2/2 twill;
– mass (g/m ): 157;
– warp yarn: nylon yarn of 70 denier/34 filaments;

– weft yarn (conductive part): 3-ply nylon yarn of 70 denier/24 filaments coated by Ag;

– weft yarn (non-conductive part): nylon yarn of 70 denier/24 filaments;
– warp density (threads/cm): 94;
– weft density (threads/cm): 31.
Key
1 conductive part
2 non-conductive part
Figure A.1 – Conductive fabric
A.2 R , RH and R
et_al L

Table A.1 shows the repeatability of the test results. For repeatability test, a non-porous

hydrophilic breathable membrane is used.
---------------------- Page: 13 ----------------------
– 12 – IEC 63203-201-3:2021  IEC 2021
Table A.1 – Arithmetic mean and CV % of test results
RH L
et_al
Specimen
m ∙Pa/W Ω/m
1 16,975 84,613 4,613
2 15,471 83,305 4,653
3 16,816 85,531 4,640
4 17,338 84,600 4,483
5 16,608 85,000 4,560
Arithmetic mean 16,642 84,610 4,590
CV % 4,247 0,972 1,515
---------------------- Page: 14 ----------------------
IEC 63203-201-3:2021  IEC 2021 – 13 –
Bibliography
ISO 8388:1998, Knitted fabrics – Types – Vocabulary
_____________
---------------------- Page: 15 ----------------------
– 14 – IEC 63203-201-3:2021  IEC 2021
SOMMAIRE

AVANT-PROPOS .................................................................................................................. 15

1 Domaine d’application ................................................................................................... 17

2 Références normatives .................................................................................................. 17

3 Termes et définitions ..................................................................................................... 17

4 Principe de l'essai ......................................................................................................... 18

5 Matériel d'essai ............................................................................................................. 18

5.1 Plaque chaude gardée transpirante ....................................................................... 18

5.2 Dispositif comprenant un capteur de température et d’humidité avec

montage de la méthode à quatre électrodes - quatre fils ....................................... 18

5.3 Membranes ........................................................................................................... 19

5.4 Enceinte d'essai de la plaque chaude gardée transpirante .................................... 19

6 Éprouvettes d'essai ....................................................................................................... 20

6.1 Nombre d'éprouvettes d’essai ............................................................................... 20

6.2 Dimension des éprouvettes ................................................................................... 21

6.3 Conditionnement ................................................................................................... 21

7 Procédure d’essai .......................................................................................................... 21

7.1 Préparation des points de contact de la piste textile électriquement

conductrice pour la stabilité de mesure nécessaire ............................................... 21

7.2 Fixation de l'éprouvette sur l'unité de mesurage .................................................... 21

7.3 Détermination de la constante de l'appareil R et mesurage de la
et0_al

résistance à la vapeur d’eau avec couche d'air R et HR) ................................. 21

et_al

7.4 Détermination de la résistance électrique linéaire ................................................. 22

8 Rapport d’essai ............................................................................................................. 22

Annexe A (informative) Exemple de résultats d’essai .......................................................... 23

A.1 Echantillon ............................................................................................................ 23

A.2 R , HR et R ..................................................................................................... 23

et_al L

Bibliographie ......................................................................................................................... 25

Figure 1 – Plaque chaude gardée transpirante ...................................................................... 19

Figure 2 – Dispositif comprenant un capteur de température et d’humidité a
...

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