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一、前言考虑到电工标准在基本常数和基本标准之间的关系中所占的重要地位,它们的准确度相对地讲是低了。这种情况可用磁通量子的准确度来说明,它目前具有2.6×10~(-6)的不确定度。约瑟夫逊电压参考标准大大地改善了精密电压
I. INTRODUCTION Taking into account the important position of electrician standards in the relationship between basic constants and basic standards, their accuracy is relatively low. This condition can be explained by the accuracy of flux quantum, which currently has an uncertainty of 2.6 × 10 -6. Josephson voltage reference standard has greatly improved the precision voltage