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Signal transmitted through and reflected from a discontinuity. A time-domain reflectometer (TDR) is an electronic instrument that uses time-domain reflectometry to characterize and locate faults in metallic cables (for example, twisted pair wire or coaxial cable). It can also be used to locate discontinuities in a connector, printed circuit board, or any other electrical path.
The thyristor or silicon controlled rectifier, SCR is a device that has a number of unusual characteristics.It has three terminals: Anode, cathode and gate, reflecting thermionic valve / vacuum tube technology.hyristors or silicon controlled rectifiers, SCR are find many uses in electronics, and in particular for power control. These devices have even been called the workhorse of high power electronics.