Glossary

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  • s

  • Shielding Effectiveness
    Measured using plane waves in the far field (relatively far from the radiating antenna).
  • SI
    A set of measures of the quality of an electrical signal.
  • Signal Integrity
    A set of measures of the quality of an electrical signal.
  • Skin Effect
    the tendency of an alternating electric current (AC) to become distributed within a conductor such that the current density is largest near the surface of the conductor, and decreases with greater depths in the conductor
  • Standards Bodies
    Any organization whose primary activities are developing, coordinating, promulgating, revising, amending, reissuing, interpreting, or otherwise producing technical standards that are intended to address the needs of some relatively wide base of affected adopters.
  • Susceptibility
    A measure of how easily a dielectric polarizes in response to an external electric field.
  • Switch Mode Power Supply
    An electronic power supply that incorporates a switching regulator to convert electrical power efficiently.
  • t

  • TEM
    A chamber that maintains its characteristic impedance throughout its volume. Cable assemblies, connectors, and electronic devices may be placed inside the cell for testing purposes such as for measuring radiated emissions.
  • Temperature
    A numerical measure of hot or cold. Its measurement is by detection of heat radiation or particle velocity or kinetic energy, or by the bulk behavior of athermometric material.
  • Terahertz
    A unit of measure of frequency that is equal to 1 trillion hertz (1012 Hz)
  • Tesla
    Unit of magnetic field strength or magnetic flux density, commonly denoted as B. One tesla is equal to one weber per square meter.
  • Thermistor
    A type of resistor whose resistance varies significantly with temperature, more so than in standard resistors.
  • Thermocouple
    A temperature-measuring device consisting of two dissimilar conductors that contact each other at one or more spots.
  • Through-hole Technology / Thru-Hole Technology
    Refers to the mounting scheme used for electronic components that involves the use of leads on the components that are inserted into holes drilled in printed circuit boards (PCB) and soldered to pads on the opposite side either by manual assembly (hand placement) or by the use of automated(...)
  • THz
    A unit of measure of frequency that is equal to 1 trillion hertz (1012 Hz)
  • TIA-4950
    The purpose of this standard is to provide requirements for the construction and testing of electrical apparatus, or parts of such apparatus, having circuits that are not capable of causing ignition in Division 1 hazardous locations as defined in Article 500.5 of the National Electrical(...)
  • Transducer
    A transducer is an electronic device that converts one form of energy to another.
  • Transformer
    A static electrical device that transfers energy by inductive coupling between its winding circuits.
  • Transient
    A high amplitude, short-duration sound at the beginning of a waveform that occurs in phenomena such as musical sounds, noises or speech.
  • Transistor
    A semiconductor device used to amplify and switch electronic signals and electrical power. It is composed of semiconductor material with at least three terminals for connection to an external circuit.
  • Transmitter
    An electronic device which, with the aid of an antenna, produces radio waves.
  • Transverse Electromagnetic Cell
    A chamber that maintains its characteristic impedance throughout its volume. Cable assemblies, connectors, and electronic devices may be placed inside the cell for testing purposes such as for measuring radiated emissions.
  • Traveling Wave Tube
    A specialized vacuum tube that is used in electronics to amplify radio frequency (RF) signals to high power, usually as part of an electronic assembly known as a traveling-wave tube amplifier (TWTA).
  • TSB-176
    Defines recommended methods for measuring and validating radio propagation data for application in Land Mobile Radio.
  • TWT
    A specialized vacuum tube that is used in electronics to amplify radio frequency (RF) signals to high power, usually as part of an electronic assembly known as a traveling-wave tube amplifier (TWTA).
  • u

  • UL 1363
    These requirements cover indoor use cord and plug connected, relocatable power taps (RPT) rated 250 V AC or less and 20 Amperes or less. RPT are for use as a movable power supply connection for cord and plug connected electrical utilization equipment in accordance with the National Electric(...)
  • UL 1449
    UL 1449 applies to Surge Protective Devices (SPDs) designed for repeated limiting of transient voltage surges as specified in the standard on 50 or 60 Hz power circuits not exceeding 1000 V.
  • UL 1778
    This Standard is intended to reduce the risk of fire, electric shock, or injury to persons from installed equipment, both as a single unit or as a system of interconnected units, subject to installing, operating, and maintaining the equipment in the manner prescribed by the manufacturer.
  • UL 310
    This standard applies to quick-connect terminals, both connectors and tabs, having nominal widths of 2.8, 3.2, 4.8, 5.2, and 6.3 mm (0.110, 0.125, 0.187, 0.205, and 0.250 in). They are intended for internal wiring connections in electrical equipment and for the field termination of conductors(...)
  • UL 3730
    UL 3730 requirements cover photovoltaic junction boxes intended for factory and field wiring and may include conduit openings, wiring leads, and/or photovoltaic connectors intended for interconnection of PV modules.
  • UL 4703
    This standard covers single-conductor, insulated and integrally or non-integrally jacketed, sunlight resistant, photovoltaic wire rated 90°C, 105°C, 125°C, or 150°C dry and, 90°C wet, 600, 1000, or 2000 V for interconnection wiring of grounded and ungrounded photovoltaic power systems as(...)
  • UL 60384-14
    UL 60384-14 applies to “Safety Requirements for Fixed Capacitors for Use in Electronic Equipment – Part 14: Sectional Specification: Fixed Capacitors for Electromagnetic Interference Suppression and Connection to the Supply Mains.”
  • UL 60730-2-12
    UL 607320-2-12 applies to electrically operated door locks intended to prevent the opening of doors in equipment for household and similar use. 
  • UL 60730-2-13
    UL 60730-2-13 applies to automatic electrical humidity sensing controls for use in, on or in association with equipment for household and similar use, including controls for heating, air-conditioning and similar applications. The equipment may use electricity, gas, oil, solid fuel, solar(...)

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