SS72012 datasheet(134/144 Pages) ACIT

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Glossary

commonly used for insulation and/or strain relief over wire splices or

cable-connector attachments.

Twin Cable: A pair of insulated conductors twisted and/or sheathed or

held together mechanically and not identiﬁable from each other in a

common covering.

Twinaxial Cable: Cable with two insulated conductors sharing a

common shield and jacket, usually with a tightly-controlled

characteristic impedance.

Twisted Pair: A cable composed of two insulated conductors, twisted

together without a common covering.

UHF: Abbreviation for Ultra High Frequency (300MHz–3GHz).

UL: Abbreviation for Underwriters Laboratories, Inc.

Ultraviolet Degradation: Deterioration caused by long exposure of a

material to sunlight or other radiation containing ultraviolet (10–400

nanometer) rays.

Unidirectional Concentric Stranding: A stranding where each

successive layer has a different lay length, thereby retaining a circular

form with migration of strands from one layer to another.

Unidirectional Stranding: A term denoting that in a stranded

conductor all layers have the same direction of lay.

Unilay Strand: A conductor constructed with a central core

surrounded by more than one layer of helically-laid wires, with all

layers having a common length and direction of lay.

Velocity of Propagation: The ratio of the transmission speed of an

electrical signal down a length of cable compared to the speed in free

space.It is approximately equal to 100 divided by the square root of the

relative dielectric constant.

Vinyl Resin: A synthetic resin formed by the polymerization of

compounds containing the group CH2 = CH.See polyvinyl.

Viscosity: A measure of the resistance of a ﬂuid to ﬂow (usually

through a speciﬁc oriﬁce).

Volt: Unit of electromotive force.It is the difference of potential

required to make a current of one ampere ﬂow through a resistance on

one ohm.

Voltage: Electric pressure that exists between two points and is

capable of producing a ﬂow of current when a circuit between the two

points is closed.Used in place of electromotive force, potential, or

potential difference

Voltage Drop: The amount of voltage loss from original input in a

conductor of given size and length.

Voltage Rating: The highest voltage that may safely be continuously

applied to a wire or cord in conformance with standards or

speciﬁcations.

Voltage-Standing Wave Ratio (VSWR): The measure of impedance

mismatch between a transmission line and its load at a given

frequency.The higher the VSWR, the greater the mismatch.Expressed

as a ratio of the actual mismatch to a perfect match, i.e.1.25:1.

Voltage Stress: That stress found within a material when subjected to

an electrical charge.

Volume Resistivity (Speciﬁc Insulation Resistance): The electrical

resistance between opposite faces of a 1-cm cube of insulating

material, commonly expressed in ohm-centimeters.

VSWR: Voltage-standing wave ratio.

Wall Thickness: The cross-sectional thickness of a wire insulation or

cable jacket.

Water Absorption: Ratio of the weight of water absorbed by a

material to the weight of the dry material.

Waterblocked Cable: A cable constructed with no internal voids in

order to allow no longitudinal water passage under a given pressure.

Watt: Unit of power or work done at a rate of one joule per second or

rate of work represented by current of one ampere under a pressure of

one volt (volt-ampere).

Wavelength: The distance, measured in the direction of propagation,

of a repetitive electrical pulse or wave form between two successive

points that are characterized by the same phase of vibration.

Wicking: The longitudinal ﬂow of liquid in a wire or cable construction

due to capillary action.

Wire: A conductor of round, square or rectangular section.Either bare

or insulated.

Wire Gage: A system of numerical designations of wire sizes.See

American Wire Gage (AWG).

Wrapping: The method of insulating wire by serving insulating tapes

around a conductor.

X: Designation for reactance.

Yield Strength: The lowest stress at which a material undergoes

plastic deformation.Below this stress, the material is elastic; above it,

viscous.

Z: Designation for impedance.

ZO: Designation for characteristic impedance.

SS72012 Scheda tecnica(PDF) 134 Page - Amphenol CIT.

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