EN IEC 61788-23:2024

SLOVENSKI STANDARD
01-september-2024
Superprevodnost - 23. del: Meritve deleža preostale upornosti - Delež preostale
upornosti niobijskih superprevodnikov (IEC 61788-23:2024)
Superconductivity - Part 23: Residual resistance ratio measurement - Residual
resistance ratio of cavity-grade Nb superconductors (IEC 61788-23:2024)
Supraleitfähigkeit - Teil 23: Messung des Restwiderstandsverhältnisses -
Restwiderstandsverhältnis von hochreinen Nb-Supraleitern für Kavitäten (IEC 61788-
23:2024)
Supraconductivité - Partie 23: Mesurage du rapport de résistance résiduelle - Rapport de
résistance résiduelle des supraconducteurs de Nb à cavités (IEC 61788-23:2024)
Ta slovenski standard je istoveten z: EN IEC 61788-23:2024
ICS:
17.220.20 Merjenje električnih in Measurement of electrical
magnetnih veličin and magnetic quantities
29.050 Superprevodnost in prevodni Superconductivity and
materiali conducting materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 61788-23

NORME EUROPÉENNE
EUROPÄISCHE NORM June 2024
ICS 17.220; 29.050 Supersedes EN IEC 61788-23:2021
English Version
Superconductivity - Part 23: Residual resistance ratio
measurement - Residual resistance ratio of cavity-grade Nb
superconductors
(IEC 61788-23:2024)
Supraconductivité - Partie 23: Mesurage du rapport de Supraleitfähigkeit - Teil 23: Messung des
résistance résiduelle - Rapport de résistance résiduelle des Restwiderstandsverhältnisses - Restwiderstandsverhältnis
supraconducteurs de Nb à cavités von hochreinen Nb-Supraleitern für Kavitäten
(IEC 61788-23:2024) (IEC 61788-23:2024)
This European Standard was approved by CENELEC on 2024-06-26. CENELEC 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 CENELEC 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 CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61788-23:2024 E

European foreword
The text of document 90/515/FDIS, future edition 3 of IEC 61788-23, prepared by IEC/TC 90
"Superconductivity" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2025-03-26
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2027-06-26
document have to be withdrawn
This document supersedes EN IEC 61788-23:2021 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 61788-23:2024 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
IEC 61788-4 NOTE Approved as EN IEC 61788-4
IEC 61788-10 NOTE Approved as EN 61788-10
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
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.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 60050-815 - International Electrotechnical Vocabulary - - -
Part 815: Superconductivity
IEC 61788-23 ®
Edition 3.0 2024-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Superconductivity –
Part 23: Residual resistance ratio measurement – Residual resistance ratio of

cavity-grade Nb superconductors

Supraconductivité –
Partie 23: Mesurage du rapport de résistance résiduelle – Rapport de résistance

résiduelle des supraconducteurs de Nb à cavités

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220, 29.050 ISBN 978-2-8322-8888-7

– 2 – IEC 61788-23:2024 © IEC 2024
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Principle . 8
5 Measurement apparatus . 9
5.1 Mandrel or base plate . 9
5.2 Cryostat and support of mandrel or base plate . 9
6 Specimen preparation . 10
7 Data acquisition and analysis . 11
7.1 Data acquisition hardware . 11
7.2 Resistance (R ) at room temperature . 11
7.3 Residual resistance (R ) just above the superconducting transition . 12
7.4 Validation of the residual resistance measurement . 13
7.5 Residual resistance ratio . 13
8 Uncertainty of the test method . 13
9 Test report . 14
9.1 General . 14
9.2 Test information . 14
9.3 Specimen information . 14
9.4 Test conditions . 14
9.5 RRR value . 14
Annex A (informative) Additional information relating to the measurement of RRR . 15
A.1 Considerations for specimens and apparatus . 15
A.2 Considerations for specimen mounting orientation . 16
A.3 Alternative methods for increasing temperature of specimen above
superconducting transition temperature . 16
A.3.1 General . 16
A.3.2 Heater method . 16
A.3.3 Controlled methods. 16
A.4 Other test methods . 16
A.4.1 General . 16
A.4.2 Measurement of resistance versus time . 17
A.4.3 Comparison of ice point and room temperature . 17
A.4.4 Extrapolation of the resistance to 4,2 K . 17
A.4.5 Use of magnetic field to suppress superconductivity at 4,2 K . 18
A.4.6 AC techniques . 18
Annex B (informative) Uncertainty considerations . 19
B.1 Overview. 19
B.2 Definitions. 19
B.3 Consideration of the uncertainty concept . 20
B.4 Uncertainty evaluation example for IEC TC 90 standards . 22
Annex C (informative) Uncertainty evaluation for resistance ratio measurement of Nb
superconductors . 24

IEC 61788-23:2024 © IEC 2024 – 3 –
C.1 Evaluation of uncertainty . 24
C.1.1 Room temperature measurement uncertainty . 24
C.1.2 Cryogenic measurement uncertainty . 25
C.1.3 Estimation of uncertainty for typical experimental conditions . 27
C.2 Inter-laboratory comparison summary . 28
Bibliography . 29

Figure 1 – Relationship between temperature and resistance near the superconducting
transition . 8
Figure A.1 – Determination of the value of R from a resistance versus time plot . 17
Figure C.1 – Graphical description of the uncertainty of regression related to the
measurement of R . 27
Table B.1 – Output signals from two nominally identical extensometers . 20
Table B.2 – Mean values of two output signals . 20
Table B.3 – Experimental standard deviations of two output signals . 21
Table B.4 – Standard uncertainties of two output signals . 21
Table B.5 – Coefficients of variation of two output signals . 21
Table C.1 – Uncertainty of measured parameters . 27
Table C.2 – RRR values obtained by inter-laboratory comparison using liquid helium . 28

– 4 – IEC 61788-23:2024 © IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SUPERCONDUCTIVITY –
Part 23: Residual resistance ratio measurement –
Residual resistance ratio of cavity-grade Nb superconductors

FOREWORD
1) The International Electrotechnical Com
...