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Previous set of "T" Terms
THERMISTOR. A semiconductor device whose resistance varies with temperature. A type of
bolometer characterized by a decrease in resistance as the dissipated power increases. [Thermistor Manufacturers]
THERMOCOUPLE. A junction of two dissimilar metals that produces a voltage when heated. [Thermocouple Wire Manufacturers]
THERMOCOUPLE METER MOVEMENT. A meter movement that uses the current induced in a
thermocouple by the heating of a resistive element to measure the current in a circuit; used to measure
ac or dc.
THERMOPLASTIC. A synthetic mixture of rosins that is flexible and used as an insulting material.
Generally used as an insulator for low- and medium-range voltages. [ABS Plastic]
THETA.The Greek letter used to represent phase angle.
THICK FILM COMPONENTS. Passive circuit components (resistors and capacitors) having a thickness
of 0.001 centimeter.
THIN FILM COMPONENTS. Passive circuit elements (resistors and capacitors) deposited on a substrate
to a thickness of 0.0001 centimeter.
THROW. In a switch, the number of different circuits each pole can control; for example, single throw and
double throw.
THYRATRON. A gas tube used as a modulator switching device.
THYRATRON TUBE. A gas-filled triode in which a sufficiently large positive pulse applied to the
control grid ionizes the gas and causes the tube to conduct, after which the control grid has no effect in
conduction.
Thyristor. A bi-stable semiconductor device that comprises three or more junctions and can be switched
from the off-state or on-state to the opposite state. Manufacturers that produce Thyristors
TICKLER COIL. A small coil connected in series with the collector or plate circuit of a transistor or tube
and inductively coupled to the base or grid-circuit coil to establish feedback (regeneration).
TIME BASE. An oscillator found inside an electronic instrument that serves as a reference for all of the time and frequency functions performed by that instrument.
TIME CODE. A code (usually digital) that contains enough information to synchronize a clock to the correct time-of-day. [IRIG Standards].
TIME CONSTANT. Time required for an exponential quantity to change by an amount equal to 63.2 percent of the total change that can occur.
TIME DELAY RELAY. A relay in which its contacts are delayed from opening or closing after the relay has been energized or de-energized. Also see Relay Manufacturers.
TIME-DIVISION MULTIPLEXING. The process that periodically samples the full 360 degrees of each
sine wave. The sample can be of a received signal or of a signal to be transmitted.
TIME DOMAIN. The measurement domain where voltage and power are measured as functions of time.
TIME INTERVAL. The elapsed time between two events.
TIME LAG. The delay in a servosystem between the application of the input signal and the actual
movement of the load.
| TIMER. A circuit used to track the passage of time. A 555 IC is a common integrated circuit used as a timer via the charging rate of an RC circuit. Also refer to following 555 circuit descriptions; 555 Monostable Circuit, 555 Astable Circuit, and 555 50% Duty Cycle Circuit. See SYNCHRONIZER. [IC Clocks and Timers]. Also see Watchdog Timer. |
 555 Timer |
TIMING SKEW. The difference in time between a pulse edge and a reference pulse or its expected transition.
TIN WHISKER. Tin whiskers are electrically conductive, crystalline structures of tin that sometimes grow from surfaces where tin (especially electroplated tin) is used as a final finish."NASA". [Tin Whisker Growth].
TINNING. The coating of a surface with a uniform layer of solder. Read more on Tinning
| TOGGLE SWITCH. A mechanical switch that uses a toggle action to actuate the switch. A toggle throw may be maintained or momentary, vertical and right angle mounting, through hole or surface mount. Also see Companies making Toggle Switches |
 Toggle |
TOLERANCE. The maximum permissible error or variation from the standard in a measuring instrument. A maximum electrical or mechanical variation of specifications that can be tolerated without impairing the operation of a device. A documented range over which a specified value may vary. Resistor Tolerance.
TOPOLOGIES. The layout of a network. The method that devices are connected together Network Topologies.
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