吉林化工学院毕业设计说明书通信线路故障测试仪设计TheDesigningofMalfunctionApparatusfortheLinesofCommunication学生学号：04530222学生姓名：黄光浩专业班级：电信0601指导教师：杨明职称：助教起止日期：2010.3.5～2010.6.22吉林化工学院JilinInstituteofChemicalTechnology吉林化工学院毕业设计说明书摘要为了快速准确的找到通讯电缆故障所发生的位置，及时修复故障线路，确保整个通讯网络的安全稳定运行，减少因通讯线路故障带来的经济损失，节省巡线的人力和物力。因此，研究通讯线路故障的测试方法，开发出行之有效的故障检测装置是非常有必要的。本文介绍了一种利用低压脉冲反射法测量通信电缆断点故障位置的方法，及89C51单片机建立电缆断点故障的测距系统。通过该系统控制发射高频脉冲，将脉冲波幅度提高，结合设备载波送入电缆，脉冲波在电缆中传播，遇到高阻的断点、终端点就会发生反射，反射波又经脉冲接收电路到达该系统。在线获取从发射脉冲波开始到接收反射脉冲波为止的时间，计算出电缆断点故障点的准确位置。该系统结构简单、操作简便、测距精度较高、应用效果良好。为了体现设计内容具有现实意义，能够将理论设计应用于实际，在附录中对测距电路主控、发射电路、接收部分电路用Protel99se画了原理图及对接收电路做了PCB设计。关键词：通讯线路；脉冲；故障测试；单片机-I-吉林化工学院毕业设计说明书AbstractInordertofastaccuratethepositionwhichfoundthecommunicationcablefaulttooccur,Thepromptrepairfaultyline,guaranteestheentirecommunicationnetworkthesecuritystablemovement,reduceseconomiclosswhichbecausethecommunicationlinesbreakdownbrings,patrolseconomicalthelinemanpowerandthephysicalresource.Soitisveryimportanttostudyanddevelopaefficaciousoffaultlocationequipment.Themethodofmeasuringthedistanceofbreakpointfaultofcommunicationcablewithlowvoltagepulsereflectionandrelatedsystemestablishedby89C52singlechipcomputeralepresented．Inthissystem，highfrequencypulsesweregeneratedandtheamplitudewereraised．Throughthecarrierofthedevice，thepulsewavewassendingintothecable．Thewavewouldbereflectedwhenitreachedthebreakpointbe．causeofthehighresistance．Thereflectivewavewouldbesentbacktopulsereceivingcircuitinthesystem．Bycalculatingthetimeperiodbe-tweensendingandreceivingofthewave，accuratepositionofthebreakpointcouldbedetermined．Thesystemisinsimpleconstructionandeasyoperation，Itofersprecisedistancemeasurementandexcellentefects.Inordertomanifestthedesigncontenthasthepracticalsignificance,canapplyinactualthetheoreticaldesign，therange-measuringcircuitmastercontrol,thetransmissioncircuit,thereceivepartialelectriccircuitshasbeendrawntheschematicdiagramwithProtel99seintheappendix,andalsothereceivepartialelectriccircuitshasbeenmadethePCBdesign.KeyWords：Communicationlines；Pulse；faulttest；signlechipcomputer目录-II-吉林化工学院毕业设计说明书摘要·································································································IAbstract··································································································II第1章绪论····························································································1第2章通讯线路故障分析·····························································...
