• 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
實(shí)時(shí)監(jiān)控統(tǒng)狀態(tài),包括 RAM、CPU 利用率及進(jìn)程、CPU 平均負(fù)載、磁盤(pán)分區(qū)信息、系統(tǒng)正常工作時(shí)間、系統(tǒng)正在運(yùn)行時(shí)間等;顯示系統(tǒng)信息,包括主機(jī)名稱(chēng)、操作系統(tǒng)內(nèi)核版本、內(nèi)存、CPU 信息、系統(tǒng)定時(shí)任務(wù)等;實(shí)時(shí)監(jiān)測(cè)網(wǎng)口傳輸速率,監(jiān)測(cè)網(wǎng)絡(luò)連接,ARP 緩存表,網(wǎng)口帶寬顯示;可直接查詢(xún)最近登錄服務(wù)器的 IP 地址和登錄日期,及正在登錄賬戶(hù)信息。
重要特點(diǎn)
● 全狀態(tài)信息顯示
● 自動(dòng)記錄主要內(nèi)部事件
● 全面的時(shí)鐘和頻率控制
● 自動(dòng)同步1PPS信號(hào)
● 輸入:1PPS x 2
● 輸出:5 / 10 MHz x 2(可自設(shè)置);100KHz x 1;1MHz x 1;1PPS x3
重要功能
性能指標(biāo)
項(xiàng)目
標(biāo)準(zhǔn)銫束管
高性能銫束管
初始頻率準(zhǔn)確度
≤1.0E-12
≤±5.0E-13
環(huán)境穩(wěn)定性
≤1.0E-13
≤±8.0E-14
頻率穩(wěn)定度 (阿倫方差)
0.01 s
≤7.5E-11
≤7.5E-11
0.1 s
≤1.2E-11
≤1.2E-11
1S
≤1.2E-11
≤5.0E-12
10S
≤8.5E-12
≤3.5E-12
100S
≤2.7E-12
≤8.5E-13
1,000S
≤8.5E-13
≤2.7E-13
10,000S
≤2.7E-13
≤8.5E-14
100,000S
≤8.5E-14
≤2.7E-14
5天
≤5E-14
≤1E-14
30天
≤5.0E-14
≤1E-14
閃爍本底
≤5.0E-14
≤1E-14
典型值
≤1.5E-14
≤5.0E-15
相位噪聲 (dBc/Hz)
信號(hào)類(lèi)型
10MHz
5MHz
1Hz
≤-100
≤-106
10Hz
≤-130
≤-136
100Hz
≤-145
≤-145
1KHz
≤-150
≤-150
10KHz
≤-154
≤-154
100kHz
≤-154
≤-154
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.