IPC-T-50F_.pdf.pdf - 第54页

Permeability 21.1803 A general term used to express various relationships between magnetic induction and magnetizing force. Permittivity 21.0846 see ‘ ‘Dielectric Constant.’ ’ Personality Plate 92.0234 A translator ﬁxtur…

Para-aramid 44.1464

The generic term that describes ﬁbers that are made from

wholly- aromatic polyamide, amide polymers in which at

least 85 % of the amide linkages are directly attached to

two benzene rings at the para position in the polymer

chain.

Parallel Pair 22.0828

Two conductors that are side-by-side at a controlled spac-

ing.

Parallel-Gap Soldering 75.1465

The passing of an electrical current through a high-

resistance space between two parallel electrodes in order to

provide the energy required to make a soldered termina-

tion.

Parallel-Gap Welding 75.1466

The passing of an electrical current through a high-

resistance space between two parallel electrodes in order to

provide the energy required to make a welded termination.

Parameter Record 25.0829

A record that deﬁnes the characteristics of a subsequent set

of records such as job identiﬁcation, electrical description,

tolerances, etc.

Pareto Analysis 94.0830

A problem-solving technique whereby all potential prob-

lem areas or sources of variation are ranked according to

their contribution to the end result.

Partial Lift 74.0831

A bonded lead that has been partial removed from the

bonding area.

Partially-Clinched Lead 72.1467

A component lead that is inserted through a hole in a

printed board and is then formed in order to retain the

component in place and but not necessarily in order to

make metal-to-metal contact with a land prior to soldering.

(See also ‘‘Clinched Lead.’’)

Passivation 57.0832

The formation of an insulating layer to protect a surface

from contaminants, moisture and particulate matter.

Passive Base Material 44.0834

Base material, that does not exhibit transistance, that serves

as the physical support and thermal sink for ﬁlm circuits.

Passive Component (Element) 30.1468

A discrete electronic device whose basic character does not

change while it processes an applied signal. (This includes

components such as resistors, capacitors, and inductors.)

Passive-Active Cell 76.0833

A cell whose electromotive force is due to the potential

difference between a metal in an active state and the same

metal in a passive state.

Paste Flux 75.0836

A ﬂux formulated in the form of a paste to facilitate its

application. (See also ‘‘Solder Paste’’ and ‘‘Solder-Paste

Flux.’’)

Paste, Soldering 75.0835

A soldering method that uses a solder paste applied to the

land, device termination, or both.

Path 20.0837

see ‘‘Conductor.’’

Pattern 20.0838

The conﬁguration of conductive and nonconductive mate-

rials on a base material, and the circuit conﬁguration on

related tools, drawings and masters.

Pattern Area 20.0839

The section of a designated conﬁguration that includes the

pattern and background.

Pattern Plating 53.0840

The selective plating of a conductive pattern.

Peel Strength 92.0841

The force per unit width that is required to peel a conduc-

tor foil from a laminate perpendicular to the surface of the

substrate.

Percent Contribution 91.0842

The amount that a single factor contributes to a total varia-

tion, expressed as a percent.

Percent of the Field of View 92.0843

The speciﬁc part of interest of the minimum required ﬁeld

of view of a magniﬁcation device.

Perforated (Pierced) Solder Terminal 37.1469

A ﬂat-metal solder terminal with an opening through which

one or more wires are placed prior to soldering. (See Fig-

ure P-1.)

Perimeter Sealing Area 30.0844

The surface on the perimeter of the cavity of a package that

is used for attachment to the package cover.

Permanent Resist 52.0845

A resist that is not removed after processing, e.g., plating

resist that is used in a fully-additive process.

June 1996 IPC-T-50F

Permeability 21.1803

A general term used to express various relationships

between magnetic induction and magnetizing force.

Permittivity 21.0846

see ‘‘Dielectric Constant.’’

Personality Plate 92.0234

A translator ﬁxture plate drilled to match the product under

test.

Photographic Fog 24.1470

Any unwanted increase in density on a negative-working

photographic product or a loss of density on a positive-

working product that appears on exposed and processed

glass ﬁlm or paper that is not the result of image exposure.

Photographic Image 24.0456

An image in a photomask or in an emulsion that is on a

ﬁlm or plate.

Photographic Layer 52.0850

A light-sensitive layer of material that is capable of being

exposed and processed so that it yields a visible image.

Photographic Operation 24.0851

A procedure or technique that prepares a phototool for sub-

sequent processing.

Photographic Plate 24.0852

A ‘‘soda-lime-silica’’ sheet of glass with a photographic

layer.

Photographic-Reduction Dimension 53.0255

The dimensions on an artwork master, such as the distance

between lines or between two speciﬁed points, tha indicate

the extent to which the artwork master is to be photo-

graphically reduced. (The value of the dimension refers to

the 1-to-1 scale and must be speciﬁed.)

Photomaster 24.0853

see ‘‘Artwork Master.’’

Photometry 24.0854

The measurement of the effect of the intensity and energy

of visible light on the human eye.

Photoplotting 24.0855

A photographic process whereby an image is generated by

a controlled- light beam that directly exposes a light-

sensitive material.

Photoprint 52.0856

The process of forming a circuit pattern image by harden-

ing a photosensitive polymeric material by passing light

through a photographic ﬁlm.

Photoresist 52.1472

A material that is sensitive to portions of the light spectrum

and that, when properly exposed can mask portions of a

base metal with a high degree of integrity.

Photoresist Image 52.0857

An exposed and developed image in a coating on a base

material.

Phototool 24.0858

A photographic product that is used to produce a pattern on

a material. (see also ‘‘Artwork,’’ ‘‘Artwork Master,’’ ‘‘Pro-

duction Master,’’ ‘‘Working Master.’’)

Phototooling 24.0859

The entire group of photographic products that are used to

produce an pattern on a base material.

Phototooling Aid 24.0860

A photographic product that is used to assist in the inspec-

tion of, but not the transfer of, imaged patterns.

Pick 44.0861

Filling yarn that runs crosswise to the entire width of a

fabric.

Pick-Up Force 73.1760

The force required to pick up a surface mounting compo-

nent from its packaging medium for placement on a sub-

strate.

Pick-Up Tool 73.1759

A tool used to pick up surface mount components from a

packaging medium for placement on a substrate and which

may be hand activated or a part of a pick-and-place

machine.

Pilot Hole 22.0862

see ‘‘Tooling Hole.’’

Pinhole (Material) 92.0863

An imperfection in the form of a small hole that penetrates

entirely through a layer of material. (See also ‘‘Pit’’ and

‘‘Solder Connection Pinhole.’’)

IPC-I-001024

Figure P–1 Perforated (pierced) solder terminal

IPC-T-50F June 1996

Pinhole (Phototool) 24.0864

A clear defect that is completely within a black pattern or

in the black background of a clear pattern.

Pink Ring 55.0865

A zone around a through-hole/inner-layer interface from

which a copper oxide coating has been chemically

removed.

Pit 92.0866

An imperfection in the form of a small hole that does not

penetrate entirely through a layer of foil. (See also ‘‘Pin-

hole, Material.’’)

Pitch 22.1473

The nominal center-to-center distance of adjacent conduc-

tors. (When the conductors are of equal size and their spac-

ing is uniform, the pitch is usually measured from the ref-

erence edge of the adjacent conductors.)

Pixel 25.0867

The smallest deﬁnable picture element area capable of

being displayed.

Placement Force 73.1761

The force required to deposit a surface mount component.

Plain Weave 44.0868

A fabric conﬁguration whereby each warp end goes over

one pick and under the next, and whereby each pick goes

over one warp end and under the next.

Planar-Mount Device 33.0869

see ‘‘Surface-Mount Component (SMC).’’

Plastic 40.0870

Any of a group of synthetic or natural organic materials

that may be shaped when softened and then hardened.

Plastic Deformation 40.0871

Deformation that does, or will, remain permanent after

removal of the load that caused it.

Plastic Device 30.0872

A semiconductor component wherein the package or

encapsulant is plastic.

Plate Finish, Laminating 55.1474

The surface ﬁnish, without modiﬁcation by subsequent pro-

cessing, of the metal on metal-clad base material that

results from direct contact with laminating-press plates.

Plated-Through Hole (PTH) 22.1475

A hole with plating on its walls that makes an electrical

connection between conductive patterns on internal layers,

external layers, or both, of a printed board.

Plated-Through Hole Structure Test 92.1476

The visual examination of the metallic conductors and

plated-through holes of a printed board after the dielectric

material has been dissolved away.

Plating (n.) 53.0873

The chemical or electrochemical deposited metal on a sur-

face.

Plating (v.) 53.0874

Chemical or electrochemical deposition of metal on all or

part of the conductive pattern, base material and/or through

holes.

Plating Bar 53.0876

The conductive path that temporarily interconnects areas of

a conductive pattern that are to be electroplated. (See also

‘‘Bus Bar.’’)

Plating, Burned 53.0875

A rough, dull electrodeposit that was caused by excessive

plating current density.

Plating Thief 53.1477

A racking device, or nonfunctional pattern on a panel, that

is used to help achieve a more uniform current density on

plated parts during an electroplating process.

Plating Up 53.0877

The electrochemical deposition of a conductive material on

a base material that takes place after the base material has

been made conductive.

Plied Yarn 44.0878

Yarn with two or more twisted yarns.

Plotting 24.0879

The mechanical converting of X-Y position information

into a visual pattern, such as artwork.

Plug Connector 37.0880

The unmounted half of a two-piece connector pair that

mates with a receptacle connector.

Point Angle 51.0881

The included angle between the two primary cutting edges

of a drill.

Poisson Distribution 91.1478

A discrete probability distribution for attributes data that is

particularly applicable when there are many opportunities

for the occurence of an event but a low probability on each

trial.

Polar Matter 76.0883

A substance that can dissolve in water and hydrophillic

solvents.

June 1996 IPC-T-50F