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Keyword: cable breakpoint; measure range system; AT89C52; high-frequency narrow pulse Abstract: the development of electric power and communication technology promotes the apply of cable widely, the trouble of cable become more and more. establish the measure cable breakpoint location range system to locate the breakpoint rapidly, the location of cable breakpoint can be calculated by the interval time that the pulse transmit and receive. All kinds cable be used widely as the electric power and communication technology develop, the core of cable broken is a common phenomenon. And the work of examine and repair cable is more heavy. For the cable lay underground, breakpoint is covered by the protect and shield stuff, simple tools can not find breakpoint, it must adopt special way to measure the breakpoint location.So finding the breakpoint is the precondition to eliminate problem, finding the distance of breakpoint can shorten the measure time, benefit for eliminating problem and reducing loss.

Circuit design for measure cable breakpoint location range based on AT89C52