FprEN IEC 63350:2025

SLOVENSKI STANDARD
oSIST prEN IEC 63350:2025
01-julij-2025
Gospodinjski električni aparati - Specifikacija lastnosti digitalnega sistema za
merjenje učinkovitost delovanja
Household electric appliances - Specification of the properties of a digital system for
measuring the performance
Appareils électrodomestiques - Spécification des propriétés d'un système numérique
pour les mesurages d'aptitude à la fonction
Ta slovenski standard je istoveten z: prEN IEC 63350:2025
ICS:
17.180.20 Barve in merjenje svetlobe Colours and measurement of
light
97.040.20 Štedilniki, delovni pulti, Cooking ranges, working
pečice in podobni aparati tables, ovens and similar
appliances
oSIST prEN IEC 63350:2025 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN IEC 63350:2025
oSIST prEN IEC 63350:2025
59K/413/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 63350 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2025-05-23 2025-08-15
SUPERSEDES DOCUMENTS:
59K/402/CD, 59K/408A/CC
IEC SC 59K : PERFORMANCE OF HOUSEHOLD AND SIMILAR ELECTRICAL COOKING APPLIANCES
SECRETARIAT: SECRETARY:
Germany Ms Susanne Stolz
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):

ASPECTS CONCERNED:
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
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This document is still under study and subject to change. It should not be used for reference purposes.
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clauses to be included should this proposal proceed. Recipients are reminded that the CDV stage is the final stage for
submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).

TITLE:
Household electric appliances - Specification of the properties of a digital system for measuring the
performance
PROPOSED STABILITY DATE: 2028
NOTE FROM TC/SC OFFICERS:
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oSIST prEN IEC 63350:2025
Link to Committee Draft for Vote (CDV) online document:
https://osd.iec.ch/#/editor/archive/17757827-8714-bf59-e063-1910000a9f65/en/CCDV/1

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oSIST prEN IEC 63350:2025
IEC CDV 63350 ED1 © IEC 2025 - 3 -
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 8
3.1 Terms and definitions. 8
3.2 Terms and definitions of international lighting vocabulary . 9
4 Test setup . 9
4.1 Illumination . 9
4.2 Measurement environment . 10
5 Determination of shade charts . 10
5.1 Principals of shade creation . 10
5.2 Brown shade charts . 11
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
7.7 Input image colour channel data . 18
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
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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 . 29

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 . 18
ab
Table B.1 – CIELAB Values for the brown shade charts . 22
Table C.1 – CIELAB Values for the green shade charts . 24

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IEC CDV 63350 ED1 © IEC 2025 - 5 -
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Household electric appliances - Specification of the properties of a digital
system for measuring the performance –

FOREWORD
a) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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h) 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.
i) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s),
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represent the latest information, which may be obtained from the patent database available at
https://patents.iec.ch. IEC shall not be held responsible for identifying any or all such patent rights.
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.
This first edition cancels and replaces the IEC TS 63350 published in 2022.
The text of this document is based on the following documents:
Draft Report on voting
59K/402/CD -
Full information on the voting for its approval can be found in the report on voting indicated in the
above table.
The language used for the development of this document is English.
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This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available at
https://www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at https://www.iec.ch/standardsdev/publications.
The committee has decided that the contents of this document will remain unchanged until the stability
date indicated on the IEC website under webstore.iec.ch in the data related to the specific document.
At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
oSIST prEN IEC 63350:2025
IEC CDV 63350 ED1 © IEC 2025 - 7 -
INTRODUCTION
IEC subcommittee 59K has agreed to make a collection of existing and future requirements on a
digital system used in testing the performance of appliances under the scope of SC 59K, cooking
appliances.
This document bundles the generic requirements given in IEC 60350-1 and IEC 60350-2 that are
updated, aligned, and supplemented by further requirements. The reference colour system is changed
from a proprietary colour system to the standardized and widely used CIELAB-based reference colour
system.
The intention with this publication is to ensure that using a digital system, which complies with the
stated requirements and described methods, leads to reproducible results.
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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Household electric appliances - Specification of the properties of a digital
system for measuring the performance –

1 Scope
This document 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.
NOTE 1 The principles of ISO 10012 are followed to ensure the capability of the systems.
NOTE 2 Possible suppliers for the recommended digital system can be found in the supplementary file located at:
https://www.iec.ch/sc59k/supportingdocuments
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 12647-7, Graphic technology - Process control for the production of half-tone colour
separations, proof and production prints - Part 7: Proofing processes working directly from
digital data
ISO 15076-1, Image technology colour management - Architecture, profile format and data
structure - Part 1: Based on ICC.1:2010
CIE 15, Colorimetry
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 https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1 Terms and definitions
3.1.1
digital system
system that is used for measuring the characteristics of visually detectable performance
3.1.2
assessment area
area of the digital system within which the requirements stated in this document shall be met
and the items under test are positioned

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3.1.3
shade chart
sample representing the reference values for the colour and lightness recognition and used for
calibration of the digital system
3.1.4
items under test
IUT
objects positioned in the assessment area for evaluation
EXAMPLE 1 Shortbread, small cakes, broccoli, white bread, in accordance with IEC 60350 -1.
EXAMPLE 2 Floured disc, in accordance with IEC 60350-2.
3.2 Terms and definitions of international lighting vocabulary
L* CIELAB lightness
a*, b* CIELAB a*, b* coordinates
C* CIELAB chroma
ab
h CIELAB hue angle
ab
∆L* CIELAB lightness difference
∆E* CIELAB colour difference
ab
∆E CIEDE2000 colour difference
4 Test setup
4.1 Illumination
The measurement is taken under an illumination similar to the CIE Standard Illuminate used for the
definition of the shade chart (see Clause 5).
The maximum calculated deviation of rendering the shade chart under the used light shall be ∆L* ≤ 1
for a measurement system for lightness recognition, and ∆E ≤ 5 for a measurement system for
colour recognition.
To calculate the deviation of the colour rendering, the 10° tristimulus values of the reference colours
shall be calculated with the spectral distribution of the reference colours defined in the corresponding
performance test for the relative spectral power distribution of CIE D65 and the relative spectral power
distribution of the test setup illumination. The calculation shall be performed from 400 nm to 700 nm
with a step of increment no more than 10 nm.
Test setup illumination spectral power distribution measurement is made on the central axis of the
beam, and with the sensing surface normal to this direction. The spectroradiometer sensing surface is
placed at a distance which ensures sufficient light for a measurement to be taken while eliminating any
stray light. The light shall stabilise before measurements are made (e.g. stable temperature).
Spectral distribution of the reference colours for the calculation shall be acquired with a diffuse eight-
degree geometry, specular component included measurement mode (di:8°) spectrometer in
accordance with CIE 15.
NOTE 1 Necessary information on calculating the tristimulus, spectral distribution of D65, L*, a*, b* and ∆E can
be found in the ISO 11664 series.
An Excel evaluation program, which corresponds to the described method, is available as an
example for the automatic calculation of the deviation of the colour rendering for measured light
___________
Excel is the trade name of a product supplied by Microsoft Corporation. This information is given for the
convenience of users of this standard and does not constitute an endorsement by IEC of the product named.
Equivalent products may be used if they can be shown to lead to the same results.
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spectra from at least 400 nm to 700 nm with a step of increment 10 nm; see Annex Annex D. This
document includes the light spectra of the proposed reference colours of this document and the light
spectra of the CRI calculation colours (CIE 15).
NOTE 2 The supplementary file for the described method is located at:
https://www.iec.ch/sc59k/supportingdocuments.
4.2 Measurement environment
During measurements, movable items other than the items under test , such as containers, reference
objects, jigs, and other similar items, may be present near or inside the assessment area, provided
that measures are implemented to mitigate their effect on the object under test and ensure that the
measurement results remain within the specified tolerances.
EXAMPLE For example by placing known reference objects (e.g. shade charts) within the assessment area, in the
presence of these non-IUT items, and performing measurements using the same setup. The measured values of
these reference objects has to be compared to their known values to confirm that the deviation remains within the
specified tolerances. This verification has to be documented and repeated at intervals to ensure ongoing compliance
with the tolerance requirements.
The assessment area shall be kept as constant as possible since every item can alter the illumination
by absorption or reflection.
5 Determination of shade charts
5.1 Principals of shade creation
shade chart represent the reference values for the colour and lightness recognition. Since the
recognition is based on classes, the shade chart shall represent the centre point of each class.
For recognition based on 1-dimensional classes (e.g. L*), the values of the defined reference colour
shall be in the centre of the boundaries of each class. This is achieved by mathematically creating the
reference colours along a line in the 3-dimensional CIELAB colour space.
For recognition based on multiple dimensions within the CIELAB colour space, the defined reference
colours shall be located with equal distances within a space defined by at least 3 coordinates. The
equal distancing between the defined colours shall be based on at least two values of the CIELAB
system (ISO/CIE 11664-4). This results in a colour gradient with a linear step size in at least 2
dimensions.
Defined colours shall be printed in accordance with the proof process described in ISO 12647-7 on
matt proofing paper simulating PS5 (print substrate 5 in accordance with ISO 12647-2) as spot
colours. The printed colour samples shall be calibrated with a diffuse eight-degree geometry, specular
component included measurement mode (di:8°) spectrometer CIE 15 and shall be in a range of ∆L* ≤
1,5 if used as reference colours for the lightness recognition and ∆E ≤ 5 if used as reference colours
for the colour recognition.
Proof process defined in ISO 12647-7 is referring to spectral measurement defined in ISO 13655
which is (45°:0°) or (0°:45°) geometry and D50 reference illumination. For proper colour
communication, conversion of the colour information to a reference colour space described in ISO
15076-1 is necessary. Converted values and the applied conversion models for the exemplary shade
chart shown in this document can be found in Annex Annex B and Annex Annex C.
Created shade chart shall be within the limits of the sRGB colour space.
NOTE 1 Requirements for colour measuring instruments in accordance with CIE 15 for (di:8°) and (45°:0°) or
(0°:45°) geometry can be found in Annex Annex A.
NOTE 2 Necessary information on transforming the CIEXYZ colour space to sRGB can be found in IEC 61966 -2-1
and transforming the CIELAB colour space to the CIEXYZ colour space can be found in ISO 11664 -4.
NOTE 3 It is recommended to seek proofing companies that fulfil the Fogra52 certification requirements, as this
certification ensures compliance with the referenced ISO standards. Fogra52 certification verifies that the conditions
outlined in ISO 12647-7 and ISO 12647-2 are consistently followed, providing an additional level of assurance for
quality and reliability in the proofing process.

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NOTE 3 Fogra Forschungsinstitut für Medientechnologien e.V. maintains a list of contract proof creation companies
that hold the required certifications. This list is available on their homepage for reference.
NOTE 4 For visual assessment of defined colours, the contract proof requirements of ISO 12647 -7 for spot colours
are sufficient to indicate colour accuracy. Spot colours are allowed a maximum deviation of 2,5 ΔE 0:45°
respectively 45:0° M1, which is close to the just noticeable difference for human vision, ensuring reliable colour
representation.
5.2 Brown shade charts
Brown shade chart are used to verify the lightness recognition of the digital measurement system. The
relevant value for the brown shade chart is L*.
The ∆L* of each defined colour step shall be equal. To achieve a linear colour gradient between the
L*
defined colours the ( ) coordinates shall lie on a line that connects at least 2 (maximum 4) reference
a*
b*
colours within the 3-dimensional CIELAB colour space. This results in a uniform Euclidean distance
(∆E* ) of the points that lie on the same line.
ab
As an example, the calculated values of 14 reference colours located on 2 lines based on 3 L*, a* and
b* coordinates are shown in Table 1.
27,8 60,7 88,9
L*
In the example, the 3 defined ( ) coordinates are ( 6,4), (16,4), (2,9).
a*
4,4 33,0 27,0
b*
Table 1 – Brown shade charts with class limits
Shade L* a* b* ∆L* Lower L* limit for Upper L* limit for ∆E* R G B
ab
No. shade class shade class
17 27,8 6,4 4,4 0 30,15 78 62 59
16 32,5 7,9 8,5 4,7
...