国家电压副基准近年来的变化——用约瑟夫森电压标准进行监测

Change of the National Secondary Standard of Voltage inRecent Years-Monitoring it by Using the Josephson Junction Array Voltage Standard

自１９９３年１Ｖ结阵约瑟夫森电压标准正常运行以来，就开始对国家电压副基准进行了连续的监测。经过近四年的连续测量发现：国家副基准电池组０５１中的十个标准电池的电动势都呈上升趋势，其中最大的０５１－２达到０．２０４μＶ／年，最小的０５１－８达到０．０４４μＶ／年，十个标准电池的电动势的算术平均值的变化速率为＋０．０８１μＶ／年，并且随时间几乎成直线上升关系。

Abstract: The national secondary standard of voltage has been continuously monitored since the 1V Josephson Junction Array Voltage Standard was put into operation in 1993. It has been shown that, all of the EMFs of the ten standard cells increased continuously with time in the past four years. The fastest (051-2), the slowest (051-8) and the average rate of the ten cells were +020μV/year, +0081μV/year and +0044μV/year, respectively. All of the changes are almost linear with time.