SIST EN IEC 61788-23:2018

SLOVENSKI STANDARD
01-december-2018
Superprevodnost - 23. del: Meritve razmerja preostale upornosti - Razmerje
preostale upornosti Nb superprevodnikov (IEC 61788-23:2018)
Superconductivity - Part 23: Residual resistance ratio measurement - Residual
resistance ratio of Nb superconductors (IEC 61788-23:2018)
Ta slovenski standard je istoveten z: EN IEC 61788-23:2018
ICS:
17.220.20 0HUMHQMHHOHNWULþQLKLQ Measurement of electrical
PDJQHWQLKYHOLþLQ 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
October 2018
ICS 17.220; 29.050
English Version
Superconductivity - Part 23: Residual resistance ratio
measurement - Residual resistance ratio of Nb superconductors
(IEC 61788-23:2018)
Supraconductivité - Partie 23: Mesurage du rapport de Supraleitfähigkeit - Teil 23: Messung des
résistance résiduelle - Rapport de résistance résiduelle des Restwiderstandsverhältnisses - Restwiderstandsverhältnis
supraconducteurs de Nb von Nb-Supraleitern
(IEC 61788-23:2018) (IEC 61788-23:2018)
This European Standard was approved by CENELEC on 2018-07-10. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey 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
© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61788-23:2018 E

European foreword
The text of document 90/400/FDIS, future edition 1 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) 2019-04-10
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2021-07-10
document have to be withdrawn
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.

Endorsement notice
The text of the International Standard IEC 61788-23:2018 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 standards
indicated:
IEC 61788-4:2016 NOTE Harmonized as EN 61788-4:2016 (not modified)
IEC 61788-10:2006 NOTE Harmonized as EN 61788-10:2006 (not modified)

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.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60050-815 -  International Electrotechnical Vocabulary - - -
Part 815: Superconductivity
IEC 61788-23 ®
Edition 1.0 2018-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Superconductivity –
Part 23: Residual resistance ratio measurement – Residual resistance ratio of Nb

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

résiduelle des supraconducteurs de Nb

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220; 29.050 ISBN 978-2-8322-5719-7

– 2 – IEC 61788-23:2018 © IEC 2018
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 . 11
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 . 13
9.1 General . 13
9.2 Test information . 13
9.3 Specimen information . 13
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 . 19
B.4 Uncertainty evaluation example for TC 90 standards . 21

IEC 61788-23:2018 © IEC 2018 – 3 –
Annex C (informative) Uncertainty evaluation for resistance ratio measurement of Nb
superconductors . 23
C.1 Evaluation of uncertainty . 23
C.1.1 Room temperature measurement uncertainty . 23
C.1.2 Cryogenic measurement uncertainty . 24
C.1.3 Estimation of uncertainty for typical experimental conditions . 26
C.2 Round robin test summary . 26
Bibliography . 28

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 . 25
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 . 20
Table B.4 – Standard uncertainties of two output signals . 21
Table B.5 – Coefficient of variations of two output signals . 21
Table C.1 – Uncertainty of measured parameters . 26
Table C.2 – RRR values obtained by round robin test . 27

– 4 – IEC 61788-23:2018 © IEC 2018
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SUPERCONDUCTIVITY –
Part 23: Residual resistance ratio measurement –
Residual resistance ratio of Nb superconductors

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in
addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
preparation is entrusted to technical committees; any IEC Nat
...