"A"
"B"
"C",
"D",
"E",
"F",
"G",
"H",
"I",
"J",
"K",
"L",
"M",
"N",
"O",
"P",
"Q",
"R",
"S",
"T",
"U",
"V",
"W",
"X",
"Y",
"Z"
Previous set of "T" Terms and definitions
TRIAC. A three-terminal device that is similar to two SCRs back to back with a common gate and
common terminals. Although similar in construction and operation to the SCR, the triac controls and
conducts current flow during both alternations of an ac cycle.
TRIGGER. A short pulse, either positive or negative, that can be used to cause an electronic function to
take place.
TRIGGER GENERATOR. See SYNCHRONIZER.
TRIGGER PULSES. In radar, pulses that are used to initiate specific events.
TRIODE TUBE. A three-electrode electron tube containing a plate, a cathode, and a control grid.
TRIP-ELEMENT. The part of a circuit breaker that senses any overload condition and causes the circuit
breaker to open the circuit.
TRIP-FREE CIRCUIT BREAKER. A circuit breaker that will open a circuit even if the operating
mechanism is held in the ON position.
TRIVALENT IMPURITY. Acceptor impurities containing only three valence electrons.
TROPOSPHERE. The portion of the atmosphere, closest to the earths surface, where all weather
phenomena take place.
TROPOSPHERIC SCATTER. The propagation of radio waves in the troposphere by means of scatter.
TROUBLE INDICATORS. Signal lights used to aid maintenance personnel in locating troubles quickly.
TROUBLESHOOTING. The process of locating and diagnosing faults in equipment by means of
systematic checking or analysis.
TROUBLE TABLES. Tables of trouble symptoms and probable causes, furnished by many manufacturers
to help technicians isolate problems.
TROUGH (BOTTOM). The peak of the negative alternation (maximum value below the line) of a sine
wave.
TRUE BEARING. Angle between a target and true north measured clockwise in the horizontal plane.
TRUE NORTH. Geographic north.
TRUE POWER. The power dissipated in the resistance of the circuit, or the power actually used in the
circuit.
TRUNCATED PARABOLOID. A paraboloid reflector that has been cut away at the top and bottom to
increase beam width in the vertical plane.
TRUTH TABLE. A table that describes a logic function by listing all possible combinations of input
values and indicating, for each combination, the true output values. [Logic Truth Tables]
TUBE DYNAMIC CONDITION. Refers to the testing condition in which a vacuum tube is actually
performing its function.
TUBE STATIC CONDITION. Refers to the testing condition in which a tube has certain voltages applied
but is not in its normal operating condition.
"T" Terms and definitions
