便携式数字兆欧表的设计

Portable and Numerical Megohm-Meter

列车供电线路的绝缘值是列车安全运行的重要因素之一,是列车每次进出库都必须检测的项目;便携式数字兆欧表是一种对列车供电线路进行绝缘检测的专用检测设备,它以单片机为核心控制单元,采用双积分型ADC芯片和电桥法进行采样,通过继电器阵列对列车供电线路进行自动切换测量,具有自动保存数据功能,通过USB接口与计算机通讯实现数据的传输,便于列车信息的网络化管理;兆欧表具有测量精度高、性能稳定、操作简单、显示直观、实用性强、携带方便等特点,是实现列车网络化管理必不可少的检测设备之一。

The insulation resistance of train electrie line is one of the significant factors of train safety running and must be deteeled in or out the carharn. ＇the portable and numerical me,ohm meter is a special equipment to detect the insulation resistance of train electric ine. The system uses sin. gle-chip microeompmers as intelligent instcruments, adopts the dual slope imegrating ADC and the electric resistance bridge to .sanple. has self - switch detection function based on the relay array and self--save ftmction, and transmits the data to the PC by the USB line to be advanlage to the ad ministration of nelworks. The megohm meter has several advantages such as hiRh accuracy, stable capabilily, simple operation, intuhionistic display, strong praetieabilhy, portable, etc. it is a indispensable equipment of train administration of networks.