Revised
IEC 61788-4:2016 specifies a test method for the determination of the residual resistance ratio (RRR) of Nb-Ti and Nb3Sn composite superconductors with Cu, Cu-Ni, Cu/Cu-Ni and Al matrix. This method is intended for use with superconductor specimens that have a monolithic structure with rectangular or round cross-section, RRR value less than 350, and cross-sectional area less than 3 mm2. In the case of Nb3Sn, the specimens have received a reaction heat-treatment. This fourth edition cancels and replaces the third edition published in 2011. This edition constitutes a technical revision.
                WITHDRAWN
                                    IEC 61788-4:2011 ED3
                            
                    WITHDRAWN
                    IEC 61788-4:2016 ED4
                    99.60
                                        Withdrawal effective
                    Mar 20, 2020
                
                PUBLISHED
                                    IEC 61788-4:2020 ED5