Glossary

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  • n

  • NEBS
    Most common set of safety, spatial and environmental design guidelines applied to telecommunications equipment in the United States. It is an industry requirement, but not a legal requirement.
  • Network Equipment Building System
    Most common set of safety, spatial and environmental design guidelines applied to telecommunications equipment in the United States. It is an industry requirement, but not a legal requirement.
  • NHTSA
    The National Highway Traffic Safety Administration (NHTSA,) is an agency of the Executive Branch of the U.S. government, part of the Department of Transportation. It is dedicated to achieving the highest standards of excellence in motor vehicle and highway safety.
  • Noise
    A measure of undesired noise mixed into the output.
  • o

  • OATS
    A test facility location, free of reflecting objects except a ground plane, where radiated emission tests may be carried out per CISPR 22.
  • On Your Mark
    An ongoing column covering compliance of graphical signs, colors, formats and symbols used in global safety warning labels and signage.
  • Open Area Test Site
    A test facility location, free of reflecting objects except a ground plane, where radiated emission tests may be carried out per CISPR 22.
  • Output Power
    Actual amount of power (in watts) of radio frequency (RF) energy that a transmitter produces at its output.
  • Output to Input Ratio
    The output power of a transducer divided by the input power.
  • p

  • Parasitic Capacitance
    An unavoidable and usually unwanted capacitance that exists between the parts of an electronic component or circuit simply because of their proximity to each other.
  • Partial Inductance
    a concept to understand which portions of the loop have the largest impact on loop inductance
  • Partial Mutual Inductance
    the net flux from one segment that passes through a second segment's infinite rectangular loop divided by the current in the first segment
  • Phase Modulation
    A modulation pattern that encodes information as variations in the instantaneous phase of a carrier wave.
  • Phototransistor
    An electronic switching and current amplifying device (transistor) that cconverts light energy into electric energy.
  • Pre-Emphasis
    a system process designed to increase the magnitude of some frequencies with respect to the magnitude of other frequencies in order to improve the overall signal-to-noise ratio by minimizing the adverse effects of such phenomena as attenuation distortion or saturation of recording media in(...)
  • Probe
    A physical device used to connect electronic test equipment to the device under test.
  • Push-Pull Output
    A type of electronic circuit that uses a pair of active devices that alternately supply current to, or absorb current from, a connected load.
  • q

  • QAM
    A modulation method of using both an (in-phase) carrier wave and a 'quadrature' carrier wave that is 90° out of phase with the main, or in-phase, carrier.
  • Quadrature amplitude modulation
    A modulation method of using both an (in-phase) carrier wave and a 'quadrature' carrier wave that is 90° out of phase with the main, or in-phase, carrier.
  • r

  • Radiated Emissions
    The unintentional release of electromagnetic energy from an electronic device or apparatus.
  • Radiated Immunity
    Ability to withstand electromagnetic energy that arrives via free-space propagation.
  • Radiated Susceptibility
    The determination or measurement of a device's capability to function in the presence of undesirable radiated EMI from external electromagnetic sources.
  • Radio Equipment Directive
    The Radio Equipment Directive (RED) (2014/53/EU) ensures a Single Market for radio equipment by setting essential requirements for safety and health, electromagnetic compatibility, and the efficient use of the radio spectrum. It applies to all products using the radio frequency spectrum and(...)
  • Radio Frequency
    Rate of oscillation in the range of about 3 kHz to 300 GHz, which corresponds to the frequency of radio waves, and the alternating currents which carry radio signals.
  • Radio Frequency Compatibility
    Ability of antenna-connected RF receiver and transmitter subsystems operating within a system to function properly without performance degradation caused by antenna-to-antenna coupling.
  • Radio Frequency Interference
    Also known as Electromagnetic Interference. A disturbance that affects an electrical circuit due to either electromagnetic induction or electromagnetic radiation emitted from an external source.
  • Radio Technical Commission for Aeronautics
    A US volunteer organization that develops technical guidance for use by government regulatory authorities and by industry. It has over 200 committees and overall acts as an advisory body to the FAA.
  • Reality Engineering
    This column is comprised of a “lessons-learned” editorial approach and contributed by readers anxious to share their trials and tribulations in compliance engineering.
  • Receiver
    An electronic device that converts a signal from a modulated radio wave into usable information.
  • Receiver Equalization
    a method of restoring a signal’s high-frequency components that the media preferentially attenuates
  • Rectifier
    An electrical device that converts an alternating current into a direct one by allowing a current to flow through it in one direction only.
  • RED
    The Radio Equipment Directive (RED) (2014/53/EU) ensures a Single Market for radio equipment by setting essential requirements for safety and health, electromagnetic compatibility, and the efficient use of the radio spectrum. It applies to all products using the radio frequency spectrum and(...)
  • Relay
    An electrically operated switch.
  • Reliability Engineering
    An area of study focused on optimizing the reliability, or probability of successful functioning, of systems, such as airplanes, linear accelerators, and any other product.
  • RF
    Rate of oscillation in the range of about 3 kHz to 300 GHz, which corresponds to the frequency of radio waves, and the alternating currents which carry radio signals.
  • RFI
    Also known as Electromagnetic Interference. A disturbance that affects an electrical circuit due to either electromagnetic induction or electromagnetic radiation emitted from an external source.
  • RTCA
    A US volunteer organization that develops technical guidance for use by government regulatory authorities and by industry. It has over 200 committees and overall acts as an advisory body to the FAA.

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