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There are a lot of signal lines in the signal chamber, how to accurately locate the fault position is a problem to be solved. Aiming at grounding model of fault wire resistance-capacitance network, a single frequency amplitude-phase fault location method was proposed in this paper, that is to determine the position of the fault point according to amplitude-phase information in each test point of the fault component wire. And in response to the operational boundlessness of single frequency amplitude-phase method, dual frequency amplitude-phase location principle based on equivalent phase difference was proposed.A portable signal cable fault location detector is introduced. It has been designed in a compact size by using TMS320 C5509A. The system principle is embodied with hardware and software design. Through test in the laboratory as well as systematic joint debugging, test was conducted on simulated fault cable using sender unit and signal reception device. The result of the test shows that the test system is able to locate the fault of grounding 1 MΩ resistance.The error of fault location indicates that this instrument achieves satisfied precision and works well in engineering environment .