EN ISO 16831:2025

SLOVENSKI STANDARD
01-oktober-2025
Neporušitvene preiskave - Ultrazvočne preiskave - Karakterizacija in preverjanje
ultrazvočne opreme za določanje debeline (ISO 16831:2025)
Non-destructive testing - Ultrasonic testing - Characterization and verification of
ultrasonic equipment for the determination of thickness (ISO 16831:2025)
Zerstörungsfreie Prüfung - Ultraschallprüfung - Charakterisierung und Verifizierung der
Ultraschall-Prüfausrüstung zur Dickenbestimmung (ISO 16831:2025)
Essais non destructifs - Contrôle par ultrasons - Caractérisation et vérification des
appareils de contrôle par ultrasons pour la détermination de l’épaisseur (ISO
16831:2025)
Ta slovenski standard je istoveten z: EN ISO 16831:2025
ICS:
19.100 Neporušitveno preskušanje Non-destructive testing
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 16831
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2025
EUROPÄISCHE NORM
ICS 19.100 Supersedes EN 15317:2013
English Version
Non-destructive testing - Ultrasonic testing -
Characterization and verification of ultrasonic equipment
for the determination of thickness (ISO 16831:2025)
Essais non destructifs - Contrôle par ultrasons - Zerstörungsfreie Prüfung - Ultraschallprüfung -
Caractérisation et vérification des appareils de Charakterisierung und Verifizierung der Ultraschall-
contrôle par ultrasons pour la détermination de Prüfausrüstung zur Dickenbestimmung (ISO
l'épaisseur (ISO 16831:2025) 16831:2025)
This European Standard was approved by CEN on 11 May 2025.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 16831:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 16831:2025) has been prepared by Technical Committee ISO/TC 135 "Non-
destructive testing" in collaboration with Technical Committee CEN/TC 138 “Non-destructive testing”
the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by November 2025, and conflicting national standards
shall be withdrawn at the latest by November 2025.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 15317:2013.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 16831:2025 has been approved by CEN as EN ISO 16831:2025 without any modification.

International
Standard
ISO 16831
Second edition
Non-destructive testing —
2025-05
Ultrasonic testing —
Characterization and verification
of ultrasonic equipment for the
determination of thickness
Essais non destructifs — Contrôle par ultrasons —
Caractérisation et vérification des appareils de contrôle par
ultrasons pour la détermination de l’épaisseur
Reference number
ISO 16831:2025(en) © ISO 2025
ISO 16831:2025(en)
© ISO 2025
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 16831:2025(en)
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 General requirements . 1
5 Manufacturer’s technical specification for ultrasonic equipment for thickness
determination . 2
5.1 General .2
5.2 General attributes .2
5.3 Display.2
5.4 Transmitter .3
5.5 Receiver .3
5.6 Other information .3
6 Blocks . 3
6.1 General .3
6.2 Material .4
6.3 Shape and size .4
6.3.1 Accuracy blocks . .4
6.3.2 Resolution block .5
7 Performance requirements for ultrasonic equipment for thickness determination. 5
8 Probes . 6
9 Group 1 tests . 7
9.1 Equipment required for Group 1 tests .7
9.2 Stability against temperature of the instrument .7
9.2.1 Procedure .7
9.2.2 Acceptance criterion .7
9.3 Low-battery warning .7
9.3.1 Procedure .7
9.3.2 Acceptance criteria .8
9.4 Battery operational time .8
9.4.1 Procedure .8
9.4.2 Acceptance criteria .8
9.5 Stability against voltage variation .8
9.5.1 Procedure .8
9.5.2 Acceptance criterion .9
9.6 Operational current range .9
9.6.1 Procedure .9
9.6.2 Acceptance criterion .9
9.7 Extended operational temperature range of the probe .9
9.7.1 General .9
9.7.2 Procedure .9
9.7.3 Acceptance criteria .9
9.8 Pulse repetition frequency .10
9.8.1 Procedure .10
9.8.2 Acceptance criterion .10
9.9 Transmitter voltage, pulse rise time and duration .10
9.9.1 Procedure .10
9.9.2 Acceptance criteria . 12
9.10 Gain control of the receiver . 12
9.10.1 General . 12
9.10.2 Procedure . 12
9.10.3 Acceptance criteria . 12

iii
ISO 16831:2025(en)
9.11 Frequency response of the receiver . 12
9.11.1 General . 12
9.11.2 Procedure . 12
9.11.3 Acceptance criteria . 13
9.12 Setup of the instrument . 13
9.12.1 General . 13
9.12.2 Procedure . 13
9.13 Determination performance and resolution . 13
9.13.1 Procedure . 13
9.13.2 Acceptance criteria .14
9.14 Display response time .14
9.14.1 Procedure .14
9.14.2 Acceptance criterion .14
10 Group 2 tests . 14
10.1 Equipment required for Group 2 tests .14
10.2 General characteristics .14
10.3 General mechanical state and external aspects .14
11 Group 3 tests .15
11.1 General . 15
11.2 General mechanical state and external aspects . 15
11.3 Performance . 15
11.3.1 Procedure . 15
11.3.2 Acceptance criterion . 15
Bibliography .16

iv
ISO 16831:2025(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO 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, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 135, Non-destructive testing, Subcommittee
SC 3, Ultrasonic testing, in collaboration with the European Committee for Standardization (CEN) Technical
Committee CEN/TC 138, Non-destructive testing, in accordance with the Agreement on technical cooperation
between ISO and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 16831:2012), which has been technically
revised.
The main changes are as follows:
— terminology has been revised from "measurement" to "determination"; as only the time of flight of the
ultrasonic signal can be measured in relation to traceable references, the thickness and sound velocity
can only be determined;
— tests have been adapted to the boundary conditions of digital instruments;
— procedures for Group 2 and Group 3 tests have been simplified;
— Clauses for characterisation of the receiver have been added.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

v
International Standard ISO 16831:2025(en)
Non-destructive testing — Ultrasonic testing —
Characterization and verification of ultrasonic equipment for
the determination of thickness
1 Scope
This document specifies test methods and acceptance criteria, within the frequency range of 0,5 MHz to
15 MHz, for assessing the performance of equipment dedicated for determining thickness using pulse-echo
ultrasound, e.g. according to ISO 16809.
This document only specifies the verifications required for the determination of thickness.
This document is applicable to instruments with numerical display and instruments with A-scan
presentation, each using either single- or dual-transducer probes.
The tests described in this document can be used for verifying equipment covered by ISO 22232-1 and
ISO 22232-2 when used for thickness determination.
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 5577, Non-destructive testing — Ultrasonic testing — Vocabulary
ISO 22232-2, Non-destructive testing — Characterization and verification of ultrasonic test equipment — Part
2: Probes
EN 10025-2, Hot rolled products of structural steels — Part 2: Technical delivery conditions for non-alloy
structural steels
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 5577 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 General requirements
Equipment for the determination of thickness using ultrasound is in accordance with this document if it
fulfils all the following requirements:
a) the equipment shall be in accordance with Clauses 8, 9, 10 and 11;
b) a statement of conformity shall be available;

ISO 16831:2025(en)
c) each component shall be clearly marked to identify the manufacturer and shall carry a unique serial
number or shall show
...