IEC 61788-11:2011

IEC 61788-11 ®
Edition 2.0 2011-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Superconductivity –
Part 11: Residual resistance ratio measurement – Residual resistance ratio of
Nb Sn composite superconductors
Supraconductivité –
Partie 11: Mesure du rapport de résistance résiduelle – Rapport de résistance
résiduelle des supraconducteurs composites de Nb Sn
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IEC 61788-11 ®
Edition 2.0 2011-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Superconductivity –
Part 11: Residual resistance ratio measurement – Residual resistance ratio of
Nb Sn composite superconductors
Supraconductivité –
Partie 11: Mesure du rapport de résistance résiduelle – Rapport de résistance
résiduelle des supraconducteurs composites de Nb Sn
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX S
ICS 17.220; 29.050 ISBN 978-2-88912-581-4

– 2 – 61788-11  IEC:2011
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Requirements . 7
5 Apparatus . 7
5.1 Material of measuring base plate . 7
5.2 Length of the measuring base plate . 7
5.3 Cryostat for the resistance, R , measurement . 7
6 Specimen preparation. 8
7 Data acquisition and analysis . 8
7.1 Resistance (R ) at room temperature . 8
7.2 Resistance (R ) just above the superconducting transition . 8
7.3 Residual resistance ratio (RRR) . 10
8 Uncertainty and stability of the test method . 11
8.1 Temperature . 11
8.2 Voltage measurement. 11
8.3 Current . 11
8.4 Dimension . 11
9 Test report. 11
9.1 RRR value . 11
9.2 Specimen . 11
9.3 Test conditions . 12
Annex A (informative) Additional information relating to the measurement of RRR . 13
Annex B (informative) Uncertainty considerations . 15
Annex C (informative) Uncertainty evaluation in test method of RRR for Nb Sn . 19
Figure 1 – Relationship between temperature and resistance  . 7
Figure 2 – Voltage (U) versus temperature (T) curves and definitions of each voltage . 9

Table B.1 – Output signals from two nominally identical extensometers . 16
Table B.2 – Mean values of two output signals . 16
Table B.3 – Experimental standard deviations of two output signals. 16
Table B.4 – Standard uncertainties of two output signals . 17
Table B.5 – Coefficient of variations of two output signals. 17
Table C.1 – Uncertainty of each measurement . 20
Table C.2 – Obtained values of R , R and RRR for three Nb Sn samples. 21
1 2 3
61788-11  IEC:2011 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SUPERCONDUCTIVITY –
Part 11: Residual resistance ratio measurement –
Residual resistance ratio of Nb Sn composite superconductors
FOREWORD
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International Standard IEC 61788-11 has been prepared by IEC Technical Committee 90:
Superconductivity.
This second edition cancels and replaces the first edition published in 2003. It constitutes a
technical revision. The main revisions are the addition of two new annexes, "Uncertainty
considerations" (Annex B) and "Uncertainty evaluation in test method of RRR for Nb Sn"
(Annex C).
– 4 – 61788-11  IEC:2011
The text of this standard is based on the following documents:
FDIS Report on voting
90/268/FDIS 90/279/RVD
Full information on the voting for the approval of this standard 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 of the IEC 61788 series, published under the general title Superconductivity,
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 web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
61788-11  IEC:2011 – 5 –
INTRODUC
...