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铯原子束频率基准是一个重要的研制课题。这里对Cs-Ⅲ基准系统、电路和结构作了简明介绍,着重评定了其准确度和稳定性。目前水平是:对原子时UTC(NIM)进行校准,能在两个月以上的时间内连续提供频率不确定度优于3×10~(-13)的标准频率信号。
Cesium atomic beam frequency reference is an important research topic. Here Cs-Ⅲ reference system, circuit and structure made a brief introduction, focusing on the assessment of its accuracy and stability. The current level is that UTC (NIM) at the atomic time is calibrated to provide standard frequency signals with a frequency uncertainty better than 3 × 10 ~ (-13) continuously for more than two months.