This part of IEC 61788 covers a test method for the determination of the residual resistance ratio (RRR} of a composite superconductor comprised of Nb-Ti filaments and Cu, Cu-Ni or Cu/Cu-Ni matrix. This method is intended for use with superconductors that have a monolithic structure with rectangular or round cross-section, RRR less than 350, and cross-sectional area less than 3 mm2. All measurements are done without an applied magnetic field.
The method described in the body of this standard is the "reference" method and optional acquisition methods are outlined in Clause A.4.
IEC 61788-4:2007 history
0000 IEC 61788-4:2020 RLV
2016IEC 61788-4:2016 Superconductivity - Part 4: Residual resistance ratio measurement - Residual resistance ratio of Nb-Ti and Nb3Sn composite superconductors
2011IEC 61788-4:2011 Superconductivity - Part 4: Residual resistance ratio measurement - Residual resistance ratio of Nb-Ti composite superconductors
2007IEC 61788-4:2007 Superconductivity - Part 4: Residual resistance ratio measurement - Residual resistance ratio of Nb-Ti composite superconductors
2001IEC 61788-4:2001 Superconductivity - Part 4: Residual resistance ratio measurement; Residual resistance ratio of Nb-Ti composite superconductors