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- Precision Frequency Standard 精密频率标准
- Abstract: PLL is a close loop control system,it is used to high precision frequency and phasic conatrol. 内容提要：锁相环路是一个闭环控制系统，用于高精度的频率和相位控制。
- The uncertainty of the Cs Atomic Frequency Standard System is evaluated as well as the result of measurement of a nanosecond universal counter. 对铯原子频率标准装置不确定度和纳秒通用计数器测量结果的不确定度进行评定。
- Frequency synthersizer is one of the important part of the passive small type Rb frequency standard. 频率综合器是被动式小型铷原子频标的关键部件之一。
- QUARTUS used by the compiler, and other precision frequency, I am wrong. But there are several warning (not affect design). I graduated from the design ah! ! ! 用QUARTUS编译通过的等精度频率计，我错误，但有几个警告（不影响设计）。我的毕业设计啊！！！
- Indicated the good result of the long-term operation of the optically pumped cesium beam frequency standard in China. 强调了中国光抽运铯原子束频标经过长期连续工作所取得的优秀成果。
- Meanwhile, we take some improvement measure in order to improve the stability about rubidium atomic frequency standard. 同时通过定量分析对电路实现提出了一系列优选方案，从而使铷原子频标的性能得到改善。
- Recently, laser frequency standards have developed rapidly. 近年来，激光频标得到了迅速发展。
- The impurity that was produc ed in aging process was analyzed.The results were benefit to the research of rubidium frequency standard. 对老化过程中产生的杂质进行了分析,从而对铷频标研究提供参考依据。
- Analyses failures of XSR type of Rubidium atomic frequency standard used in our factory,and introduces the situation of particular overhaul in detail. 对我厂的频率标准XSR型铷原子频标发生的故障及具体检修情况作了较详细的分析和介绍。
- The short stability of the miniature Rubidium vapor cell frequency standard is measured to be superior to the same pattern products internaitional. 在小型化的条件下，整机短期频率稳定度达到了国际同类产品水平。
- The atomic hydrogen maser is the most stable frequency standard generally available today for all but the shortest measuring time interval. 氢脉泽是一种中、长期稳定度最高的原子频率标准。
- The hydrogen maser is the generally available frequency standard with the smallest frequency instability for all but the shortest measuring time interval. 为了提供高精密的时间频率,人类已经研制出氢原子钟,除长期稳定度之外,它的各项性能都是十分优秀的。
- Finally the waveform distortions of these springs are calculated, and the selection criteria of spring parameters in designing ultra-low frequency standard vibrator are provided. 最后计算了不同组合下弹簧的波形失真度，为设计超低频标准振动台波形失真度最小的支承弹簧提供了选择依据。
- equal precision frequency measurement 等精度测频
- The hydrogen maser isthe most stable frequency standard generally available today for all but the shortestmeasuring time.It's an important subsystem in VLBI. 氢脉泽是至今为止除极短时间测量间隔之外最稳定的频率标准,它是甚长基线干涉测量仪(VLBI)中的一个关键设备。
- identical precision frequency measurement 等精度测频
- The hydrogen maser is the most stable frequency standard generally available today for all but the shortest measuring time.It's an important subsystem in VLBI. 氢脉泽是至今为止除极短时间测量间隔之外最稳定的频率标准，它是甚长基线干涉测量仪(VLBI)中的一个关键设备。
- A portable laser system, continually working for very long period, is the key part in realization of an optically pumped cesium beam frequency standard. 长期连续工作的袖珍激光系统是实现实用的光抽运铯束频标的关键。
- The precise frequency will be determined by the HKMAs risk assessment of the institution. 至于实际的审查次数,金融管理局会视乎其对有关机构的风险评估而决定。
