reflected impulse

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• Time-domain reflectometry — or TDR is a measurement technique used to determine the characteristics of electrical lines by observing reflected waveforms. Time domain transmissometry (TDT) is an analogous technique that measures the transmitted (rather than reflected)… …   Wikipedia

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• Time-domain reflectometer — A time domain reflectometer (TDR) is an electronic instrument used to characterize and locate faults in metallic cables (for example, twisted wire pairs, coaxial cables). The equivalent device for optical fiber is an optical time domain… …   Wikipedia