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- central frequency standard 中央频率标准
- 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。
- The theoretical study shows that the central frequency is linear with the square of the voltage applied on the Wheatstone bridge. 理论研究表明：中心频率与电桥电压的平方成线性关系；
- 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。
- 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。
- The phase noise in the locked condition is measured to be -107 dBc/Hz at 10 MHz offset,and that of the ring VCO at the central frequency is -99 dBc/Hz at 10 MHz offset. 环形振荡器在偏离中心频率为10MHz处的单边带相位噪声为-107dBc/Hz.;在锁定条件下;锁相环在偏离中心频率为10MHz处的单边带相位噪声为-99dBc/Hz
- 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。
- The experimental results show that the frequency bandwidth is 22.4% for a 3-dB axial ratio criterion and is 33.85% for a VSWR<2 criterion at the central frequency 10 GHz. 获得的实测结果为:中心频率为10GHz;电压驻波比小于2的带宽为33.;85%25;圆极化轴比小于3dB的带宽为22
- Without a RF filter, B should be more than 9dB so that the out of band noises near the central frequency can achieve the DAB transmitting signal criterion. 在不加滤波器的情况下 ,离中心频率较近的带外噪声欲满足DAB发射信号频谱标准 ,B至少要在 9d B以上。
- Recently, laser frequency standards have developed rapidly. 近年来，激光频标得到了迅速发展。
- The central frequency of the filter is adjusted by changing the voltage applied on the Wheatstone bridge, which can change the average temperature and axial strain of the bridge. 通过调节施加在压敏电桥上的电压大小来改变桥的平均温度和轴向应变，可调节滤波器的中心频率。
- 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。
- A lithium niobate anisotropic acousto-electro-optic spectrum analysor with central frequency 60 MHz was made. Its central frequency can be changed from 50 MHz to 70 MHz and its bandwidth can be increase from 26 MHz to 37 MHz. 用LiNbO3制作了一个60MHz的反常声电光频谱分析器件，测试结果表明，器件中心频率可以由50MHz变到70MHz，频带宽度由原来的26MHz扩大到37MHz。
- 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。
- This paper treats of the working principle of controlling the central frequencies of the active band filter by Z80 microprocessor. 本文介绍了Z80微处理器控制有源带通滤波器的中心频率的工作原理。
- 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。
- Applying the advanced ANSOFT non-linear circuit design software Serenade, the paper designed a high linearity FET DRO by selecting varactor and optimizing output matching. The DRO operates at the central frequency of 18GHz. 在 Ansoft非线性电路设计软件 Serenade支持下 ,通过变容管的选取 ,输出端的优化匹配 ,设计了一中心频率为 18GHz的高线性度的场效应管介质谐振器稳频振荡器。
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