超导性.第11部分:剩余电阻率的测量.Nb3Sn复合超导体的剩余电阻率

[中文适用范围]： “IEC 61788 的这一部分涵盖了测定 Nb3Sn 复合超导体剩余电阻比 (RRR) 的测试方法。该方法适用于具有矩形或圆形横截面@ RRR 小于 350 的整体结构的超导体样本且横截面积小于 3 mm2@ 并接受了反应热处理。理想情况下，@ 样品应尽可能直；然而@ 情况并非总是如此@，因此必须小心测量样本处于收到状态。所有测量都是在没有施加磁场的情况下完成的。本标准正文中描述的方法是“参考”方法，第 A.3 条中概述了可选的采集方法。 [外文原描述]： IEC 61788-11:2011 covers a test method for the determination of the residual resistance ratio (RRR) of Nb3Sn composite superconductors. This method is intended for use with superconductor specimens that have a monolithic structure with rectangular or round cross-section, RRR less than 350 and cross-sectional area less than 3 mm2, and have received a reaction heat-treatment. Ideally, it is intended that the specimens be as straight as possible; however, this is not always the case, thus care must be taken to measure the specimen in its as received condition. 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.3. 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 Nb3Sn" (Annex C).