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Test Definitions

  

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EC Declaration of Conformity
  Declaration of a supplier certifying the compliance of his product with a particular European standard. In accordance with the Electromagnetic Compatibility Act, the declaration has to contain the following: the description of the corresponding device or respective devices, the source of the specification to which the declaration of conformity is relating, data concerning the internal measures taken with respect to EMC and the signature of the person entitled to sign on behalf of the manufacturer or his representatives and, if applicable the location of an EC-type certification issue by a notified body.
Source: Schaffner EMC
 
Eccentricity Ratio
  The vector difference between the bearing centerline and the average steady-state journal centerline. Applies to sleeve bearings not anti-friction bearings.
Source: Vibration Institute
 
Echo
  A signal (voltage) indicating reflected acoustic energy.
Source: Sonoscan
 
  A signal that has been reflected or otherwise returned with sufficient magnitude and delay to be perceived by the speaker.
Source: Xilinx
 
Eddy current
  Electrical current generated (and dissipated) in a conductive material (often a rotor shaft) when it intercepts the electromagnetic field of a displacement or proximity probe.
Source: Vibration and Shock
 
  Currents induced into a conducting core due to the changing magnetic field. Eddy currents produce heat which is a loss of power and lowers the efficiency of an inductor.
Source: Twisted Pair
 
Edge Clearance
  The smallest distance from any conductors or components to the edge of the PCB.
Source: PCB Universe
 
Edge Connector
  A connector on the circuit-board edge in the form of gold plated pads or lines of coated holes used to connect other circuit board or electronic device.
Source: PCB Universe
 
Edge Detection
  Any of several techniques to identify edges in an image.
Source: Coreco
 
  A process that enhances the edges in an image, for example a Sobel or Laplacian filter.
Source: Datacube
 
Edge Enhancement
  Image processing method to strengthen high spatial frequencies in the image.
Source: Coreco
 
Edge Sensitive
  An input (e.g. clock) that only affects a function (e.g. flip-flop)when it transitions from one logic value to another.
Source: Maxfield & Montrose Interactive Inc.
 
Effective Competitive Opportunities test
  (ECO Test) - Developed to determine whether U.S. carriers enjoy effective competition in a foreign carrier's market before granting U.S. market access to that foreign carrier. Following the Basic Telecom Agreement signed by World Trade Organization members in February, 1997, the FCC decided not to apply the ECO test to WTO members.
Source: Wireless Week
 
Effective Radiated Power
  (ERP) - The product of a transmitter power output and the antenna gain, taking into consideration any losses from the transmission line, connectors, couplers, etc.
Source: eEngineer
 
Efficiency
  The amount of power delivered to the load of an amplifier as a percentage of the power required from the power supply.
Source: Twisted Pair
 
Eigenvalue
  The roots of the characteristic equation. The mathematical formulation and solution of the characteristic equation is called the Eigenvalue problem.
Source: Vibration Institute
 
Eigenvector
  The mode shape vectors.
Source: Vibration Institute
 
EJTAG
  (EJTAG) - EJTAG is a hardware/software subsystem that provides comprehensive debugging and performance tuning capabilities to MIPSŪ microprocessors and to system-on-a-chip components having MIPS processor cores. It exploits the infrastructure provided by the IEEE 1149.1 JTAG Test Access Port (TAP) standard to provide an external interface, and extends the MIPS instruction set and privileged resource architectures to provide a standard software architecture for integrated system debugging.
Source: MIPS Technologies, Inc.
 
Electric Charge
  Electric energy stored on the surface of a material. Also known as a static charge.
Source: Twisted Pair
 
Electric Field
  (E) - The potential gradient of a radiated wave measured in volts/m.
Source: eEngineer
 
Electrical OverStress
  (EOS) - Electrical OverStress is a transient or steady state electrical condition that exceeds the specifications and/or capabilities of a device. Both the magnitude and duration of an EOS event can vary. Examples of mild EOS are oxide ruptures and junction damage with signs of visual stress. Severe EOS may include massive vaporization of bond wires or aluminum interconnects and carbonizing of plastic packages.
Source: ESD Systems
 
Electrical Safety Source
  Source intended to maintain the supply to electrical equipment essential for the safety services.
Source: International Electrotechnical Commission
 
Electrically Erasable Programmable Read-Only Memory
  (EEPROM) - Pronounced double-ee-prom or e-e-prom, short for electrically erasable programmable read-only memory. EEPROM is a special type of PROM that can be erased by exposing it to an electrical charge. Like other types of PROM, EEPROM retains its contents even when the power is turned off. Also like other types of ROM, EEPROM is not as fast as RAM. EEPROM is similar to flash memory (sometimes called flash EEPROM). The principal difference is that EEPROM requires data to be written or erased one byte at a time whereas flash memory allows data to be written or erased in blocks. This makes flash memory faster.
Source: Webopedia
 

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