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国家伏特基准的电动势单位量值的复现准确度在1980年用不稳定的约瑟夫森隧道结“铅-氧化铅-铅”达到了一个新的水平(未消除的系统误差<10~(-6);均方差<5×10~(-8))。这种形式的点结在高电压下具有很大的阶梯电流。但是,由于它的寿命很短,计量机构很难正式开展工作。下面介绍一种长寿命铌的约瑟
The reproducibility of the national volt-benchmark EMF magnitude reached a new level in 1980 with an unstable Josephson tunnel junction “lead-lead oxide-lead” (uncorrected system error <10 ~ ( -6); mean square deviation <5 × 10 ~ (-8)). This form of node junction has a large step current at high voltage. However, due to its short life expectancy, it is very difficult for metrological agencies to formally work. Here’s a long-lived niobium Joseph