A Time Domain Reflectometer (TDR) is an electronic tool that sends pulses down a cable or transmission line, detecting reflections to find faults, measure length, or locate impedance changes, working like radar by analysing the time and strength of returning signals to pinpoint issues like breaks, shorts, or splices in electrical paths. It's vital in telecommunications, networking, and PCB testing for diagnosing problems non-invasively and characterising signal integrity.  

TDR Time Domain Reflectometers

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