Master Catalog Page 571 Glossary

Alpha Wire 1-800-52 ALPHA Specifications subject to change. For complete specifications and availability, visit 571 IDC Insulation displacement connector. IEC International Electrotechnical Commission. IEEE Institute of Electrical and Electronic Engineers. IEEE-488 A standard for connecting test equipment. Also know as General-Purpose Interface Bus (GPIB). impact strength A test for determining the mechanical punishment a cable can withstand without physical or electrical breakdown by impacting with a given weight, dropped a given distance, in a controlled environment. impedance The total opposition that a circuit offers to the flow of alternating current or any other varying current at a particular frequency. It is a combination of resistance R and reactance X, measured in ohms. IMSA International Municipal Signal Association. index edge See reference edge. inductance The property of a circuit or circuit element that opposes a change in current flow, thus causing current changes to lag behind voltage changes. It is measured in henrys. inductive coupling Crosstalk resulting from the action of the electromagnetic field of one conductor on the other. insulation A material having high resistance to the flow of electric current. Often called a dielectric in radio frequency (coaxial) cable. insulation resistance The ratio of the applied voltage to the current between two electrodes in contact with a specific insulation. Insulation A material having high resistance to the flow of electric current. interconnecting cable The wiring between modules, between units, or the larger portions of a system. interference Electrical or electromagnetic disturbances which introduce undesirable responses into other electronic equipment. interstices Voids or valleys between individual strands in a conductor or between insulated conductors in a multiconductor cable during extreme flexing. IPCEA Insulated Power Cable Engineers Association. irradiated Exposure to high- energy radiation resulting in cross- linking of molecules. irradiation In insulations, the exposure of the material to high energy emissions for the purpose of favorably altering the molecular structure. ISA Originally, Instrument Society of America, now called International Society of Automation. ISO International Standards Organization. jacket An outer covering, usually non-metallic, mainly used for protection against the environment. jumper cable A short flat cable interconnecting two wiring boards or devices. kilo- (k) A numerical prefix denoting 1000 (10 3 ). kilometer (km) 1000 meters or 3281 feet (0.621 miles). kpsi Tensile strength in thousands of pounds per square inch. kV kilovolt, 1000 volts laminated tape A tape consisting of two or more layers of different materials bonded together. lay The length measured along the axis of a wire or cable required for a single strand (in stranded wire) or conductor (in cable) to make one complete turn about the axis of the conductor or cable. leakage current The undesirable flow of current through or over the surface of an insulation. life cycle A test to determine the length of time before failure in a controlled, usually accelerated, environment. limits of error The maximum deviation (in degrees or percent) of a thermocouple or thermocouple extension wire from standard EMF-temperature to be measured. link The complete point-to-point communications path between transmitter and receiver. litz A type of specialty cable designed to reduces AC losses in conductors from skin and proximity effects at high frequencies to make transformers and motors more efficient. Litz wire consists of individually insulated strands woven or twisted in a specific pattern so that each tends to occupy all possible positions in the cross section, thereby equalizing flux linkages and reactances. Glossary

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