| 摘要 |
A frequency domain reflectometer that is in electrical communication with a cable under test in order to determine cable characteristics including cable length and load characteristics such as capacitance, inductance, resistance, impedance (which is characterized as an open or short circuit condition), and the location of an open or short circuit, wherein the FDR cable testing is performed in-situ when the system is installed at the time of installation of the cable to thereby enable testing of cable without having to remove it and risk damage, wherein FDR cable testing is performed passively so as not to interfere with normal operation of the cable even if the FDR cable testing system should fail, wherein a system is taught that can detect faults that are difficult to detect out of an operating environment, and wherein FDR cable testing is performed to detect cable fray conditions, wherein the cable may be grounded or coupled to air.
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