IEC TS 61189-3-301:2016

IEC TS 61189-3-301 ®
Edition 1.0 2016-07
TECHNICAL
SPECIFICATION
colour
inside
Test methods for electrical materials, printed boards and other interconnection
structures and assemblies –
Part 3-301: Test methods for interconnection structures (printed boards) –
Appearance inspection method for plated surfaces on PWB
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IEC TS 61189-3-301 ®
Edition 1.0 2016-07
TECHNICAL
SPECIFICATION
colour
inside
Test methods for electrical materials, printed boards and other interconnection

structures and assemblies –
Part 3-301: Test methods for interconnection structures (printed boards) –

Appearance inspection method for plated surfaces on PWB

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.180 ISBN 978-2-8322-3550-8

– 2 – IEC TS 61189-3-301:2016  IEC 2016
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references. 5
3 Terms and definitions . 5
4 Test specimens . 5
5 Equipment / apparatus . 5
5.1 Evaluation of lustre non-uniformity . 5
5.2 Evaluation of colour non-uniformity . 6
6 Procedure . 6
6.1 Outline of the method . 6
6.2 Specimen preparation . 6
6.3 Imaging of surface roughness/chromaticity distribution . 6
6.4 Binarization of images . 6
6.5 Extraction of feature quantities . 7
6.6 Derivation of discriminant function . 7
6.7 System registration . 7
7 Report . 8
8 Additional information . 8
Annex A (informative) Example of equipment and tested result for lustre non-
uniformity . 9
A.1 Equipment for lustre non-uniformity inspection . 9
A.2 Tested result . 9
A.2.1 Surface roughness image . 9
A.2.2 Binarized image and feature extraction . 11
A.2.3 Frequency analysis of feature quantities . 12
A.2.4 Final estimate . 12
Annex B (informative) Example of tested result for colour non-uniformity inspection . 13
B.1 Image analysis of colour non-uniformity . 13
B.2 Feature extraction and discriminant analysis . 14
Bibliography . 16

Figure 1 – Flow chart of the test procedure . 6
Figure A.1 – Equipment prototype . 9
Figure A.2 – Images of gold-plating of non-defective and defective products . 10
Figure A.3 – Images of S- and P-polarized components, and Ψ’ for gold-plating with
lustre non-uniformity . 11
Figure A.4 – Image examples of gold-plating with lustre non-uniformity . 11
Figure A.5 – Example of frequency analysis of feature quantity . 12
Figure A.6 – Example of the final estimate of the quality of gold-plating . 12
Figure B.1 – Images of gold-plating pads . 13
Figure B.2 – Images of colour distribution . 14
Figure B.3 – Frequency analysis example of a feature quantity . 14
Figure B.4 – Example of the discriminant analysis result . 15

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
TEST METHODS FOR ELECTRICAL MATERIALS, PRINTED BOARDS AND
OTHER INTERCONNECTION STRUCTURES AND ASSEMBLIES –

Part 3-301: Test methods for interconnection structures (printed boards) –
Appearance inspection method for plated surfaces on PWB

FOREWORD
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future but no immediate possibility of an agreement on an International Standard.
Technical specifications are subject to review within three years of publication to decide
whether they can be transformed into International Standards.
IEC TS 61189-3-301, which is a technical specification, has been prepared by IEC technical
committee 91: Electronics assembly technology.

– 4 – IEC TS 61189-3-301:2016  IEC 2016
The text of this technical specification is based on the following documents:
Enquiry draft Report on voting
91/1348/DTS 91/1376/RVC
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 publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 61189 series, published under the general title Test methods for
electrical materials, printed boards and other interconnection structures and assemblies, can
be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• transformed into an International standard,
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

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TEST METHODS FOR ELECTRICAL MATERIALS, PRINTED BOARDS AND
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