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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.
LINK / CITE ADD TO WORD LIST. noun. The definition of a transistor is an electronic device that works by controlling the flow of the electrical current. An example of a transistor is something combined in large numbers with microcircuits into a single circuit board and used in a computer.ransistor. noun. 1  A small electronic device containing a semiconductor and having at least three electrical contacts, used in a circuit as an amplifier, detector, or switch. 2  Any of various devices serving the same purpose but employing a different technology: an optical transistor. 3  A transistor radio.