IEC 63203-201-3:2021 pdf download

IEC 63203-201-3:2021 pdf download.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 1 [SOURCE: EN 16812:2016, 3.1, modified – Note 1 to entry has been deleted.]3.2 linear electrical resistance R L 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 R 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).