前言LPP11板是RVR正常运行的核心供电单元,其工作特点是24小时不间断地为RVR测量、计算、监视单元提供模拟、数字电压,其性能变差或故障,已成为导致RVR频繁出现故障的主要原因之一。自RVR投入使用以来,已有多块LPP11板损坏。而购置新板和维修,花费较大且很难在交货时间上得到保 Foreword The LPP11 board is the core power supply unit for the normal operation of the RVR. Its working characteristic is that the RVR measurement, computation and monitoring units provide analog and digital voltages without any performance degradation or failure in a 24-hour period, which has become a frequent cause of RVR failure One of the main reasons. Several LPP11 boards have been damaged since the RVR was put into service. Purchasing new boards and repairs is expensive and difficult to secure on delivery