The progress situations of Hydrogenclock in the time keeping at abroad and home were introduced, and carry outs some discusses.
介绍了国际和国内氢钟守时的进展概况,并进行了一些讨论。
2
Based on available frequency standards: one prototype laboratory model of cesium clock, three hydrogen clocks and several (2-6) rubidium clocks, the SO atomic time scale has been established.