铷钟计时/计频器 FLUKE PM6685R/071

厂商: 美国福禄克
重量: 5.5kg

目前的计时/计频仪器

Fluke的PM6681R/PM6685R是市场上的计时/计频器，它提供了使所有的PM6681R/PM6685R的功能和稳定性都相当高的内置铷时基。高稳定性，高，短预热时间的诸多特点使得其非常适合那些不具备校准实验室环境的校准过程，如GSM等大型无线通讯网络传递基站的校准。短的预热时间意味着，当带至现场或从同一楼的一处到另一处，使用者可在几分钟内就可开始正常的测量。

高分辨率的数字计时/计频器

以近乎4GHz的时钟频率，PM6685R提供便携仪器的无与伦比的250ps的分辨率，在一秒的时间内就可给出10位的可靠显示。它充分体现了数字计时器的方便，使高的校准测量成为可能。

确保对于现场操作高稳定性

内置的铷参考时基解决了现场恶劣条件下如何确保高稳定性的难题。铷时标株子共振理论本质上其稳定性是机电结构的晶体振荡器的100倍，这也正是PM6685R能成为现场的计频器/校准器的原因。PM6685R要求在10-8数量级以上的现场测量和校准频率合适的选择。

典型的GSM基站系统时钟为13MHz，允许偏差0.65Hz，因此应该使用优于0.05ppm的单一频率源做为基准。PM6681R/6685R的开机6分钟后的就达1×10-9，稳定性为0.0005ppm/年，既不需要电源保持，也不需频繁校准，因而在很宽的范围上可满足GSM基站的校准要求。

PM6681R/PM6685R的额外特点

高，预热时间短： 6分钟可达1×10^-9 30分钟可达1×10^-10 年老化率1×10^-10
校准任何频率应用指标(4.2GHz以下)
10MHz缓冲铷参考时钟输出

技术指标

高性能型号
通用频率		PM6685R
计数器	频率范围标准	300
	加选件频率范围MHz	·
	周期	·
	比率	·
	Burst/PRF/FM	·
	求和模式	1
计时器	两通道时间间隔
	脉宽	·
	上升／下降时间
	占空比	·
	相位
分析仪	测量速度　读数／秒	1600
	存储能力　读数	2600
	调制域分析	opt.
电压	电压小值
触发	电平Auto,Man,GPIB	AMG
触发	灵敏度，Auto,Man,GPIB	AMG
分辨率	频率分辨率　位／秒	10
	单次时间分辨率	250ps
	平均时间分辨率	100ps
	触发电平分辨率 mV
	输入灵敏度 mV	10
	一年*^1	9*10^-10
	时基选择*^2	Rubidium
特点	模拟输出	·
	外触发（Arming)	·
	触发隔离／数字滤波
	模拟低道滤波	·
	统计／全运算
	模拟条形图	·
	检零	·
	关显示	·
	GPIB接口	opt.
	GPIB设置－测量－读数	125r
	尺寸
	预热时间（分钟）	6
	电池选择

频率稳定度技术指标*

老化

每月：	5 x 10E-11 (连续工作一个月后)
每年：	5 x 10E-10 (年)
	2 x 10E-10 (年之后)
参考振荡器的短期艾伦偏差：	1s: 1 x 10E-10
	10s: 3 x 10E-11
	100s: 1 x 10E-11

预热时间（25oC）

解锁状态由LED指示
锁定时间：	4 分钟
达到1 x 10E-9的准确度所需的时间：	6 分钟
回退：	5 x 10E-11
	回退是指经过1小时的工作之后的相对频率偏差，相对于切断电源24小时之前的值进行计算。

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品牌/商标

福禄克

企业类型

贸易商

原产地

美国