Microsemi(并购了Symmetricom公司) 5071A铯钟（原Agilent产品），多年来由于其工作的高可靠性及优异的准确度、稳定性，在全球时频领域得到广泛的认可和使用。5071A操作简单方便，深受用户喜爱。闪烁本底指标低达≤1.0E-14。内部铯束管有标准长寿命管和高性能管可选。标准铯束管保修期达5年。
5071A—满足一级计量校准实验室要求。
国际上各守时和国家标准实验室证实了其内部铯标准源相对于UTC的稳定性和准确度。一个标准源的准确性和可靠性决定了守时实验室的服务质量；标准源的稳定性也极其重要，因稳定性能直接影响实验室给客户传递时间和校准服务的能力。
5071A提供优异的稳定性，也是首台列明了超过一天平均时间的稳定性指标的铯频标。
5071A使用方便，自动启动和调整，无需手动启动步骤和复杂的调整操作。逻辑菜单简化了前面板操作，选择和状态报告。远程控制功能满足用户的全面操作和易于管理的需求。
技术指标
• Maintains exceptional accuracy andstability even in unstable environments—unsurpassed stability in the lab or field
• Accuracy ±1.0 x 10–12 for standard performance; ±5.0 x 10–13 for high performance
• Stability ≤1.2 x 10–11 for standard performance; ≤5.0 x 10–12 for high performance(for 1 second averaging time)
• Environmental stability ±1.0 x 10–13 forstandard performance; ±8.0 x 10–14 forhigh performance (frequency changefor any combination of environmentalconditions)
• Long-term stability ≤5.0 x 10–14 for standard performance; ≤1.0 x 10–14 for highperformance (for 5-day averaging time)
• Proven reliability with an average meantime between failures (MTBF) of greaterthan 160,000 hours
• Full traceability to NIST
• AC and DC input and internal battery
网络协议
NTP v1.v2.v3&v4(RFC1119&1305) SNTP(RFC2030) MD5 Authentication（RFC1321）Telne（t RFC854） NTP Unicast,Broadcast,Multicast,Autokey TIME（RFC868) FTP（RFC959）DAYTIME（RFC867) DHCP (RFC2131) RSA 非对称加密 HTTP/SSL/HTTPS（RFC2616) SNMP v1,v2、 SSH/SCP (Internet Draft) MIB II (RFC1213)
WEB 网管监控
实时监控统状态，包括 RAM、CPU 利用率及进程、CPU 平均负载、磁盘分区信息、系统正常工作时间、系统正在运行时间等；显示系统信息，包括主机名称、操作系统内核版本、内存、CPU 信息、系统定时任务等；实时监测网口传输速率，监测网络连接，ARP 缓存表，网口带宽显示；可直接查询最近登录服务器的 IP 地址和登录日期，及正在登录账户信息。
重要特点
● 全状态信息显示
● 自动记录主要内部事件
● 全面的时钟和频率控制
● 自动同步1PPS信号
● 输入：1PPS x 2
● 输出：5 / 10 MHz x 2(可自设置)；100KHz x 1；1MHz x 1；1PPS x3
重要功能
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性能指标
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项目
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标准铯束管
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高性能铯束管
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初始频率准确度
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≤1.0E-12
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≤±5.0E-13
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环境稳定性
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≤1.0E-13
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≤±8.0E-14
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频率稳定度 （阿伦方差）
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0.01 s
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≤7.5E-11
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≤7.5E-11
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0.1 s
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≤1.2E-11
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≤1.2E-11
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1S
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≤1.2E-11
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≤5.0E-12
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10S
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≤8.5E-12
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≤3.5E-12
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100S
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≤2.7E-12
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≤8.5E-13
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1,000S
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≤8.5E-13
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≤2.7E-13
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10,000S
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≤2.7E-13
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≤8.5E-14
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100,000S
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≤8.5E-14
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≤2.7E-14
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5天
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≤5E-14
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≤1E-14
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30天
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≤5.0E-14
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≤1E-14
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闪烁本底
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≤5.0E-14
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≤1E-14
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典型值
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≤1.5E-14
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≤5.0E-15
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相位噪声 （dBc/Hz）
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信号类型
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10MHz
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5MHz
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1Hz
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≤-100
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≤-106
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10Hz
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≤-130
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≤-136
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100Hz
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≤-145
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≤-145
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1KHz
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≤-150
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≤-150
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10KHz
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≤-154
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≤-154
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100kHz
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≤-154
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≤-154
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High-Performance Cesium Beam Tube
The 5071A high performance cesium beam tube is optimal for the most demanding operations. The high-performance tube offers a full-environment accuracy specification of ±5.0 x 10–13 —two times better than the specification for the standard tube. Stability is also significantly improved. The high-performance tube reaches a flicker floor of 1.0 x 10–14 or better, and longterm measurements at NIST show that the flicker floor is typically better than 5.0 x 10–15.
Integrated Systems and Remote Operation
Today, cesium standards are often integrated into telecommunication, satellite communication, or navigation systems asmaster clocks. To accommodate these environments, the 5071A
provides complete remote control and monitoring capabilities. Instrument functions and parameters can be interrogatedprogrammatically.
Communication is accomplished using the standard commandsfor programmable instruments (SCPI) language and a dedicatedRS-232C port. Also, a rear panel logic output can be programmed to signal when user-defined abnormal conditions exist.
For uninterruptible system service, an internal battery provides45 minutes of backup in case of AC power failure. Thus,the 5071A can be managed easily even in the most remotelocations.
