SS72012 datasheet(132/144 Pages) ACIT

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Aerospace | Military | Transportation | Industrial | Specialty

Glossary

RF: Abbreviation for radio frequency.

RF Connector: Connector used with coaxial cable.

Ribbon Cable: Flat cable with conductors that have been individually

insulated and the insulators joined on the same plane.

RG/U: Old U.S.military designation for coaxial cables covered by

speciﬁcation MIL-C-17.

RMS: Abbreviation for root-mean-square.When the term is applied to

alternating voltage and current it means the effective value; that is, it

produces the same heating effect as a direct current or voltage of the

same magnitude.It is also a mean of expressing a-c voltage in terms of

d-c.In practical terms, approximately 80% of the a-c peak voltage.

Rockwell Hardness: A test for hardness in which a hardened steel

ball or diamond point is pressed the material under test; also the scale

by which the hardness determined by this test is expressed.

Roentgen: The amount of radiation that will produce one electrostatic

unit of ions per cubic centimeter volume.

Rope Concentric: A group of stranded conductors assembled in a

concentric manner.The direction of lay of the outer rope members is

usually left hand.

Rope-Lay Conductor or Cable: A cable composed of a central core

surrounded by one or more layers of helically laid groups of wire.(Note:

This kind of cable differs from a concentric-lay conductor in that the

main strands are themselves stranded.In the most common type of

rope-lay conductor or cable, all wires are of the same size and the

central core is a concentric-lay conductor.)

Rope Unilay: A group of stranded conductors assembled in a unilay

manner.The direction of lay of the unilay rope is left hand.

Round Conductor Flat Cable: A cable made with parallel round

conductor in the same plane.

SAE: Abbreviation for Society of Automotive Engineers.

Secondary Insulation: A non-conductive material whose functions

are to protect the primary insulator against abrasion and provide a

second electrical barrier.Placed over the primary insulation.

Self-Extinguishing: The characteristic of a material that extinguishes

its own ﬂame after the igniting ﬂame is removed.

Semi-Conducting Jacket: A jacket having a sufﬁciently low

resistance so that its outer surface can be substantially kept at ground

potential by a grounded conductor in contact with it at frequent

intervals.

Serving: A wrapping applied over the core of a cable or over a wire.

Servings may be in the form of ﬁlaments, ﬁbers, yarn, tape, etc.

Shield: A metallic layer placed around an insulated conductor or group

of conductors to prevent electrostatic or electromagnetic interference

between the enclosed wires and external ﬁelds.This shield can be

braided or served wires, oil wrap, foil backed tape, a metallic tube, or

conductive vinyl or rubber.

Shield Coverage: The percentage of the underlying layer optically

covered by a braided shield.

Shield Effectiveness: The ability of a shield to screen out

interference, relative to a solid tube (100%).

Shrinkable Tubing: Polyoleﬁn tubing which shrinks to a

predetermined diameter when heated; used for mechanical protection

of splices and joints and as markers.

Shunt Wire: A conductor joining two parts of an electric circuit to

divert part of the current.

Signal: A current used to convey information (as opposed to power).

Silicone: Polymeric materials in which the recurring chemical group

contains silicon and oxygen atoms as links in the main chain.

Silver: Silver is commonly used to plate wire conductors because of its

high conductivity, corrosion resistance, and solderability, providing

many of the beneﬁts of gold plating but at far lower cost.

Sintering: Forming articles by compressing, then heating powdered

materials (such as PTFE) to a temperature below their melting point.

Skin Effect:The phenomenon wherein the depth of penetration of

electric currents into a conductor decreases as the frequency of the

current increases.

Skived Tape: Tape made by shaving a thin layer from a cylinder of

material, a method frequently used to produce PTFE tape.

Sleeving: A braided, knitted, or woven tube.

Solid Conductor: A conductor consisting of a single wire.

SPC: Silver-plated copper.

SPCW: Silver-plated copperweld (copper-covered steel).

Spark Test: A test performed on wire and cable to determine the

amount of pin holes or other defects in the insulation.

Sparkover: A disruptive discharge between electrodes of a measuring

gap, such as sphere gap or oil testing gap.

Speciﬁc Gravity: The density (mass per unit volume) of any material

divided by that of water at a standard temperature.

Speciﬁc Inductive Capacity: See dielectric constant.

Split Conductor Cable: A cable in which each conductor is composed

of two or more insulated conductors normally connected in parallel.

Spurious Signals: Undesired voltages in conductors caused by

electrostatic magnetic or electrostatic coupling from other conductors

or from external sources.

Standing Wave Ratio: See Voltage-Standing Wave Ratio.

Strand: One of the wires, or groups of wires, of any stranded

conductor.

Stranded Conductor: A conductor composed of a group of wires, or of

any combination of groups of wires.The wires in a stranded conductor

are usually twisted or braided together.

Strip: To remove insulation from a wire.

Submarine Cable: Cable used underwater for power or

communication, covered with a lead sheath and / or a rubber jacket.

Superconductors: Materials in which the resistance approaches zero,

generally at very low (cryogenic) temperatures.Superconductivity can

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