高精度网线测试仪的研究与实现  

Research and Implementation of High Precision Network Cable Tester

作　　者：陈玉[1] CHEN Yu(Information Center,Business College of Shanxi University,Taiyuan,030031)

机构地区：[1]山西大学商务学院信息中心,太原030031

出　　处：《办公自动化》2020年第6期55-57,61,共4页Office Informatization

基　　金：山西大学商务学院科研计划项目(Y2018042)资助。

摘　　要：网线故障主要表现为断路和短路两种状态,为此以较低成本设计实现了一款高精度网线测试仪,设计中提出了两种重要方法:一种是提出了使用集成化时间数字芯片来实现精确计时,同时该芯片的使用极大降低了测试仪设计难度和成本。另一种是使用了运算放大器差分放大特性来提取短路状态下反射脉冲前沿。最后实验数据表明,网线测试仪运行稳定可靠。The fault of network cable is mainly in two states:open circuit and short circuit,therefore,a high-precision network cable tester is designed and implemented at a lower cost.Two important methods are proposed in the design.One is to use the integrated time digital chip to realize the precise timing.At the same time,the use of the chip greatly reduces the design difficulty and cost of the tester.The other is to extract the front edge of the reflected pulse in the short circuit state by using the differential amplification characteristic of the operational amplifier.Finally,the experimental data show that the network cable tester runs stably and reliably.

关 键 词：时域反射 网线 盲区 差分运算 

分 类 号：TP393.0[自动化与计算机技术—计算机应用技术]