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A time-domain reflectometer (TDR) is a measurement tool used to measure the impedance profile of a component (device) under test (DUT). The concept is straightforward. Using a step generator and an oscilloscope, a fast pulse edge is launched into the DUT.
It can be used to characterize and locate faults in metallic cables (for example, twisted pair wire or coaxial cable), [1] and to locate discontinuities in a connector, printed circuit board, or any other electrical path.
The most common method for evaluating a trans- mission line and its load has traditionally involved feeding a sine wave into the system and measuring the maximum and minimum amplitudes of the stand- ing waves resulting from discontinuities on the line. From these measurements, the standing wave ratio.
The TDR measures the time it takes for the signal to travel down the cable, see the problem, and reflect back. The TDR then converts this time to distance and displays the information as a waveform and/or distance reading.
30 sty 2024 · Time-Domain Reflectometry (TDR) is an advanced technique used to test the integrity of cables by detecting faults, shorts, and breaks within them. By sending a fast pulse of energy down a cable and observing the reflections that return, TDR can accurately identify the specific locations of anomalies within the cable structure.
30 sty 2015 · designers prefer working in the time domain with logic analyzers and high-speed oscilloscopes. When compared to other measurement techniques, time domain reflectometry provides a more intuitive and direct look at the DUT’s characteristics.
Today’s Time Domain Reflectometers provide digital design engineers with powerful tools that not only display traditional impedance measurements, but they also provide ease-of-use that generate S-parameter measurements that may be used for de-embedding purposes.
