SS72012 datasheet(133/144 Pages) ACIT

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Glossary

be exhibited by many metallic elements, alloys, and intermetallic

compounds.

Surface Leakage: The passage of current over the boundary surfaces

of an insulator as distinguished from passage through its volume.

Surface Resistivity: The resistance of material between two opposite

sides of unit square of its surface.Surface resistivity may vary widely

with the conditions of measurement.

Surge: A transient upward variation in the current and / or potential at

a point in the circuit.

Sweep Test:Checking the frequency response of a coaxial cable by

generating an RF voltage, with the frequency varied through a given

frequency range at a rapid constant rate while monitoring the result on

an oscilloscope.

Tank test: A voltage dielectric test in which the specimen to be tested

is submerged in a liquid (usually water) and a voltage potential applied

between the conductor and the liquid as ground.

Tape Insulation:Insulation of helically-wound tapes applied over a

conductor or over an assembled group of insulated conductors.

Tear Strength: Force required to initiate or continue a tear in a

material under speciﬁed conditions.

Teﬂon® FEP: Registered trademark of the DuPont Company.

Fluorinated ethylene polypropylene.A 200˚C rated ﬂuoropolymer used

for insulation and jacket applications.

Teﬂon® PFA: Registered trademark of the DuPont Company.

Perﬂuoroalkoxy.A 250˚C rated ﬂuoropolymer used for insulation and

jacket applications.

Teﬂon® TFE: Registered trademark of the DuPont Company.

Tetraﬂuoroethylene.A 260˚C rated ﬂuoropolymer used for insulation

and jacket applications.

Tefzel®: Registered trademark of the DuPont Company.Ethylene

tetraﬂuoroethylene (ETFE), is a 150˚C rated ﬂuoropolymer used for

insulation and jacket applications.

Temperature Rating: The maximum temperature at which the

insulating material may be used in continuous operation without loss

of its basic properties.

Tensile Flex: Trademark for Phelps Dodge Alloy 135 high strength

copper alloy.

Tensile Strength: The pulling stress required to break a given specimen.

Tension Set: The condition when a plastic material shows a

permanent deformation caused by a stress, after the stress is removed.

Test Lead: A ﬂexible, insulated lead wire with a test probe on one end,

used for making temporary electrical connections.

TFE: Polytetraﬂuoroethylene.

Thermal Conductivity: Ability of a material to conduct heat.

Thermal Endurance: The time at a selected temperature over which a

material deteriorates to a predetermined level of electrical, mechanical,

or chemical performance under prescribed conditions of test.

Thermal Expansion (Coefﬁcient of): The change in length of a

material for a unit change in temperature.

Thermal Resistance of a Cable: The resistance offered by the

insulation and other coverings to the ﬂow of heat from the conductor

or conductors to the outer surface.

Thermal Shock: Rapid application of heat or cooling to detect

distortion or memory.

Thermocouple: A device for measuring temperature when two

electrical conductors of dissimilar metals are joined at the point of heat

to be measured.A resulting voltage difference, directly proportional to

the temperature, is developed across the free ends of the conductors

and is measured potentiometrically.

Thermocouple Lead Wire: An insulated pair of wires connecting a

thermocouple to a junction box or recording instrument.

Thermoplastic: A classiﬁcation of resin that can be softened and

resoftened by repeated heating.

Thermosetting: A resin which cures when cooled after being melted

once and cannot be resoftened by heating.

Tinned Wire: Wire that has been coated with a layer of tin or solder to

facilitate soldering.

Tinsel Wire: A low voltage, highly ﬂexible stranded wire.Each strand

is very thin conductor ribbon spirally wrapped around a textile yarn.

Insulation is generally a textile braid.

Topcoat: Term used to describe an unplated stranded conductor fused

together with an overall tin coating.

Tracer: A means of identifying polarity.Two common types are ridges

along the axis of the insulation perceptible to the touch and bands of

contrasting color in braid or wind.

Tracer Stripe: When more than one color coding stripe is required, the

ﬁrst, or widest, stripe is the base stripe; the other, usually narrower

stripes, are termed tracer stripes.

Transfer Impedance:A measure of coaxial cable shielding

performance determined by the ratio of the voltage on the conductors

enclosed by a shield to the surface currents on the outside of the shield.

Cables with low transfer impedance have higher shielding effectiveness.

Transmission Loss: The decrease power during the transmission of

energy from one point to another, expressed in decibels.

Triaxial: Similar to a coaxial cable, but with an additional layer of

dielectric and a second braided shield between the inner shield and the

jacket.The center conductor and inner shield are used for signal, and

the outer shield used for grounding.

Triboelectric Noise: Noise generated in a shielded cable due to

variations in capacitance between the shield and conductor as the

cable is ﬂexed.

Triplex Cable: A cable composed of three insulated single conductors

and often one bare conductor, all twisted together.(Note:The

assembled conductors may or may not have a common covering of

binding or protecting material.)

Tubing: Extruded non-supported plastic or elastomer material in a

tubular form.Heat-shrinkable tubing of cross-linked polymers is

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