指针式电秒表检定装置中的关键原理  

The Key Principle of the Verification Device of Electric Stopwatch

作　　者：董丹丹 Dong Dandan(Liaoning Province Advanced Equipment Manufacturing Base Construction Engineering Center,Shenyang 110801)

机构地区：[1]辽宁省先进装备制造业基地建设工程中心,沈阳市110801

出　　处：《仪器仪表标准化与计量》2022年第1期21-23,共3页Instrument Standardization & Metrology

摘　　要：目前,大部分时间测量设备均使用恒温高稳定度晶振作为内部频率标准,而在进行指针式电秒表检定时,由于标准器内部晶振与市电信号不同源,会引入工频电源的频率准确度造成的误差,进而导致检定结果错误。本文首先分析了锁相环的原理,然后通过对衰减后的工频信号进行倍频,将倍频后的信号作为频标信号输入到检定装置中的方法,设计并实现了指针式电秒表检定装置。该方法解决了指针式电秒表检定时,市电频率准确度引入的误差问题。At present, most of the time analysis equipment uses the oven controlled crystal oscillators(OCXO) as the internal frequency standard, while in the verification of electric stopwatch, the error caused by the frequency accuracy of the power supply will be introduced due to the different sources of the OCXO and the mains signal,which leads to the error of verification result. The paper first analyzes the principle of phase-locked loop, and then based on doubling the attenuation of mains signal, designed and implemented the verification device for electronic stopwatch. This method solves introducing the error problem of the mains frequency accuracy when verification the electrical stopwatch.

关 键 词：指针式电秒表 固有误差 时基准确度 市电频率准确度 

分 类 号：TH714[机械工程—测试计量技术及仪器]