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Test Definitions

  

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Race Hazard
  Also called a race condition, is a close or simultaneous timing between signals that can result in erratic circuit operation [and in a failure].
Source: A.T.E. Solutions, Inc.
 
Rack and Pinion
  Term used to describe the gear system for lowering and raising the stage or barrel when focusing. The coarse adjustment control (knob), usually moves the barrel or stage.
Source: FRT of America
 
Radar
  Acronym for "radio detection and ranging" A system that measures the distance and direction of objects.
Source: Twisted Pair
 
Radiant Flux
  The measurement of the time rate of flow of radiant energy, expressed in watts.
Source: JML Optical
 
Radiated Emissions Test
  One or more antennas are used to measure the amplitude of the electromagnetic waves that a device emits. The amplitude must be under a set limit, with the limit depending on the devices classification.
Source: Wikipedia
 
Radiated Immunity Test
  An antenna is used to subject the device to electromagnetic waves, covering a large frequency range (usually from 30 MHz to 2.9 GHz).
Source: Wikipedia
 
Radio (Frequency) Spectrum
  (RF Spectrum) - Radio spectrum consists of radio waves of different frequencies (for example, 900 MHz, 2.4GHz, 5GHz). All radio spectra are regulated, with some licensed and others unlicensed. This technique sends a message as a series of computer codes. However, since the signal is stretched out over a broad frequency band, the receiver only needs to receive a part of the transmitted signal to reconstruct the original message.
Source: Xilinx
 
Radio Frequency
  (RF) - A generic term for radio-based technology and is usually referred to whenever a signal is radiated through the air. It is the portion of the electromagnetic spectrum with frequencies between 3 kHz and 300 GHz. This corresponds to wavelengths between 30 kilometers and 0.3 millimeter. The international unit for measuring frequency is Hertz (Hz), which is equivalent to the older unit of cycles per second. One Megahertz (MHz) is one million Hertz. One Gigahertz (GHz) is one billion Hertz. For reference: the standard US electrical power frequency is 60 Hz, the AM broadcast radio frequency band is 0.55 -1.6 MHz, the FM broadcast radio frequency band is 88-108 MHz, and microwave ovens typically operate at 2.45 GHz. Typically RF are frequencies from 20 kHz to 3 GHz. Literally, any and all frequencies that can be radiated as an electromagnetic wave.
Source: Xilinx
 
Radio Frequency Interference (RFI)
  Any frequency which interferes with the electromagnetic spectrum normally associated with radio wave propagation.
Source: A.T.E. Solutions, Inc.
 
Radio Frequency Probe
  Probe used in conjunction with an AC meter to measure radio-frequency signals.
Source: Twisted Pair
 
Radix
  Refers to the number of digits in a numbering system. For example, the decimal numbering system is said to be radix-10. May also be referred to as the "base".
Source: Maxfield & Montrose Interactive Inc.
 
Random Access Memory
  (RAM) - A type of memory that offers access to storage locations within it by means of X and Y coordinates.
Source: Surface Mount Technology Association
 
  (RAM) - A type of computer memory that can be accessed randomly; that is, any byte of memory can be accessed without touching the preceding bytes. RAM is the most common type of memory found in computers and other devices, such as printers. There are 2 kinds of RAM: SRAM and DRAM.
Source: Xilinx
 
Random Failure
  A failure whose occurrence is unpredictable in an absolute sense but which is predictable only in a probabilistic or statistical sense.
Source: A.T.E. Solutions, Inc.
 
Range Checking
  The functionality of a driver that validates parameter and attribute values against published instrument limits. Range checking is a configurable behavior that can be enabled or disabled by the user.
Source: IVI Foundation
 
Rank Value Filter
  A neighborhood process where each source neighborhood of pixels is ranked in order of intensity, and the result pixel is the mean, median, minimum or maximum pixel in the neighborhood. This method is often used to remove noise.
Source: Datacube
 
Rayleigh Distribution
  A Weibull distribution whose beta (slope) value is equal to 2.0.
Source: Testability.com
 
RC Extraction
  The mathematical computation of an electronic circuit's fundamental circuit elements: resistors (abbreviated R), and capacitors (abbreviated C). RC extraction allows a simulator to determine the expected behavior of the electronic circuit through the mathematical modeling of simple circuit elements.
Source: EE Design
 
RC Time Constant
  Product of resistance and capacitance in seconds.
Source: Twisted Pair
 
Reactance
  (X) - Opposition to current flow without the dissipation of energy. Example: The opposition provided by inductance or capacitance to AC current.
Source: Twisted Pair
 
  (X) - The imaginary component of Impedance.
Source: CableTest
 
Reactive Maintenance
  (RM) - A Maintenance Event performed in response to a failure. Also called Fault-Induced or Corrective Maintenance. Although this "run it until it breaks" maintenance mode is still practiced, it is very inefficient and contributes to not only a high life cycle cost and low operational availability, but also to the risk of possible damage through secondary failures.
Source: Testability.com
 

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