Household electric appliances - Specification of the properties of a digital system for measuring the performance

IEC TS 63350:2022 specifies generic requirements for creating a digital system that is used for measuring the characteristics of visually detectable performance, such as browning intensity and lightness.
It defines the metrological requirements of this digital system and demonstrates the procedures for compliance. The digital system contains the measuring instrument, the software, and the reference materials necessary to realize the measurement process.
References to this document can be made by a customer when specifying the digital system and by the suppliers when specifying products offered.
Interested parties can agree to use this document as an input for satisfying measurement management system requirements in any activities.
The principles of ISO 10012 are followed to ensure the capability of the systems.
Currently, this document focuses on test methods described in IEC 60350-1 and IEC 60350-2 but further applications based on visually detectable performance criteria might be supplemented.

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IEC TS 63350:2022 - Household electric appliances - Specification of the properties of a digital system for measuring the performance Released:10/11/2022
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IEC TS 63350 ®
Edition 1.0 2022-10
Household electric appliances – Specification of the properties of a digital
system for measuring the performance
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IEC TS 63350 ®
Edition 1.0 2022-10
Household electric appliances – Specification of the properties of a digital

system for measuring the performance

ICS 97.040.20 ISBN 978-2-8322-5849-1

– 2 – IEC TS 63350:2022 © IEC 2022
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Test setup . 8
4.1 Illumination . 8
4.2 Measurement environment . 9
5 Determination of shade charts . 9
5.1 Principals of shade creation . 9
5.2 Brown shade charts . 10
5.3 Green shade charts . 11
6 Measurements . 13
6.1 Verification of evenness . 13
6.2 Lightness recognition (L* values) . 14
6.2.1 Description of the test samples . 14
6.2.2 Procedure . 14
6.2.3 Evaluation (requirements and tolerances) . 14
6.3 Colour recognition (L*, a*, b* values) . 14
6.3.1 Description of the test samples . 14
6.3.2 Procedure . 15
6.3.3 Evaluation (requirements and tolerances) . 15
6.4 Verification of the measurement area . 15
6.4.1 General . 15
6.4.2 Description of the test samples . 15
6.4.3 Procedure . 15
6.4.4 Evaluation (requirements and tolerances) . 15
6.5 Verification of the resolution. 15
6.6 Verification of rectilinear projection . 16
6.7 Verification of the 3-dimensional shapes . 16
7 Data to be recorded (raw data) . 17
7.1 Purpose . 17
7.2 LAB . 17
7.3 HLC . 17
7.4 ∆E for the test sample . 17
7.5 Dimensions (in mm) . 17
7.6 Specified measurement areas . 17
8 Consideration of tolerances . 18
8.1 General . 18
8.2 Calculation of differences in colour and its components . 18
8.3 Distance information . 19
Annex A (normative) Colour-measuring instrument . 20
Annex B (informative) Brown shade charts . 22
Annex C (informative) Green shade charts . 24
Annex D (informative) Evaluation program for determining the deviation in colour
rendering . 26

Annex E (informative) Examples of shade chart positioning for lightness recognition . 27
Bibliography . 28

Figure 1 – Cone shape of colour sample . 16
Figure 2 – 13 sections of the colour sample . 17
Figure A.1 – Colour measuring instrument di:8° . 20
Figure A.2 – Colour measuring instrument 45°:0° . 21
Figure E.1 – Example with an assessment area of 100 mm × 100 mm – 1 position per
row and column . 27
Figure E.2 – Example with an assessment area of 150 mm × 150 mm – 2 positions per
row and column . 27
Figure E.3 – Example with an assessment area of 470 mm × 370 mm – 4 positions per
row and column . 27

Table 1 – Brown shade charts with class limits . 11
Table 2 – Green shade charts . 12
Table 3 – Maximum CIELAB hue angle distance inside different ∆E* ranges . 19
Table B.1 – CIELAB Values for the brown shade charts . 22
Table C.1 – CIELAB Values for the green shade charts . 24

– 4 – IEC TS 63350:2022 © IEC 2022

Specification of the properties of a digital system
for measuring the performance
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IEC 63350 has been prepared by subcommittee SC 59K: Performance of household and similar
electrical cooking appliances, of IEC technical committee TC 59: Performance of household
and similar electrical appliances. It is a Technical Specification.
The text of this Technical Specification is based on the following documents:
Draft Report on voting
59K/350/DTS 59K/356/RVDTS
Full information on the voting for its approval can be found in the report on voting indicated in

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