IPC-T-50F_.pdf.pdf - 第59页

Pulse Soldering 75.0926 Soldering by the heat generated by pulsing an electrical current through a high resistance point of the joint area and the solder . Pure Sum of Squares 91.0927 The net or true average ef fect of a…

Printed Component 52.0914

A part (such as an inductor, resistor, capacitor, or transmis-

sion line) that is formed as part of the conductive pattern

of a printed board.

Printed Components, Conductive Inks 52.1600

Component (e.g. printed inductor, resistor, capacitor or

transmission line) forming part of the pattern of a printed

circuit.

Printed Contact 22.0915

A portion of a conductive pattern that serves as one part of

a contact system.

Printed Edge-Board Contact 22.0916

see ‘‘Edge-Board Contact.’’

Printed Wiring 60.1488

A conductive pattern that provides point-to-point connec-

tions but not printed components in a predetermined

arrangement on a common base. (See also ‘‘Printed Cir-

cuit.’’)

Printed Wiring Board 60.1489

A printed board that provides point-to-point connections

but not printed components in a predetermined arrange-

ment on a common base. (See also ‘‘Printed Circuit

Board.’’)

Printed Wiring Board Assembly 80.0917

An assembly that uses a printed wiring board for compo-

nent mounting and interconnecting purposes.

Printing 52.1592

Act of reproducing a pattern on a surface by any process.

Probe Point 92.0919

The predetermined location on a printed board where elec-

trical contact can be made to exposed circuitry for electri-

cal diagnostic purposes.

Probe, Test 92.0918

A spring-loaded metal device used to make electrical con-

tact between a test equipment and the unit under test.

Process Average 91.0920

The location of the distribution of measured values of a

particular process characteristic.

Process Indicator 91.0921

A detectable anomaly, other than a defect, that is reﬂective

of material, equipment, personnel, process and/or work-

manship variations.

Process Spread 91.0922

The extent to which the individual values of a process may

vary.

Processability 70.1763

Suitable and capable of being processed.

Producer’s Risk 93.0923

see ‘‘Alpha Error.’’

Production Board 60.1490

A printed board or discrete-wiring board that has been

manufactured in accordance with the applicable detailed

drawings, speciﬁcations, and procurement requirements.

Production Master 24.1642

A 1 to-1 scale pattern that is used to produce rigid or ﬂex-

ible printed boards within the accuracy speciﬁed on the

master drawimg. (See also ‘‘Multiple-image Production

Master’’ and ‘‘Single Image Production Master’’).

Production Panel (PP) 50.1787

An arrangement of printed boards fabricated from laminate

or base materials as a group in a speciﬁc cluster to facili-

tate economic fabrication techniques using controlled and

documented chemical, mechanical and electrical processes.

Production Printed Board (PPB) 50.1786

A printed board fabricated from laminate or base materials

in an environment that consists of controlled and docu-

mented chemical, mechanical and electrical processes used

in combination to produce the features and characteristics

of the ﬁnal printed board product.

Profile Factor 92.1492

The amount by which the overall average thickness of a

metal exceeds the thickness that is calculated from the

established density of the metal and the area of the sample.

Propagation Delay 21.1493

The time required for an electronic signal to travel along a

transmission line, or the time required for a logic device to

perform its function and to present a signal at its output.

Proportional Dimensions 92.0924

The distortion of an optical system used in a magnification

device.

Pull Strength 92.0925

see ‘‘Bond Strength.’’

Pull-Out Strength 97.1816

The force, normal to the printed board, required to seperate

the metallic wall of a plated-through hole from the base

material.

Pulse, Electronic Signal 21.1494

A logic signal that switches from one digital state to the

other and back again in a short period of time, and that

remains in the original state for most of the time

IPC-T-50F June 1996

Pulse Soldering 75.0926

Soldering by the heat generated by pulsing an electrical

current through a high resistance point of the joint area and

the solder.

Pure Sum of Squares 91.0927

The net or true average effect of a factor. (See also ‘‘Sum

of Squares.’’)

Push-Off Strength 97.0928

The force required to dislodge a leadless component by the

application of a force that is parallel to the surface upon

which it is mounted.

Qualification Agency 94.1212

The organization that is used to perform documentation

reviews and audits of an inspection or testing facility.

Qualification Testing 94.1213

The demonstration of the ability to meet all of the require-

ments speciﬁed for a product.

Qualitative Analysis 92.1214

The subdivision of chemistry concerned with the identiﬁ-

cation of materials.

Quality Conformance Testing 94.1496

Qualiﬁcation testing that is performed on a regularly-

scheduled basis in order to demonstrate the continued abil-

ity of a product to meet all of the quality requirements

speciﬁed.

Quality-Conformance Test Circuitry 92.1495

A portion of a printed board panel that contains a complete

set of test coupons that are used to determine the accept-

ability of the board(s) on the panel.

Quantitative Analysis 92.1215

The subdivision of chemistry concerned with the determi-

nation of the percentage composition of mixtures or the

constituents of a pure compound.

Quasi-Interfacial Connection 22.1216

see ‘‘Interfacial Connection.’’

Quasi-Interfacial Plated-Through Hole 22.1201

see ‘‘Nonfunctional Interfacial Connection.’’

Quill 44.1202

A bobbin onto which ﬁlling yarns are wound.

Radiant Flux 56.1304

The amount of power that is incident on a surface,

expressed in watts.

Radiant Intensity 56.1305

The amount of power from a point source that is generated

through a solid angle, measured in watts per steradian.

Radiator, Focused 56.1306

A reﬂector that is incorporated in the back of an emitter for

the purpose of concentrating energy to produce a point or

line of heat.

Radiator, Nonfocused 56.1307

A diffusing reﬂector that is incorporated in the back of an

emitter for the purpose of scattering energy over an area.

Radiometry 24.1308

The measurement of radiation in the optical spectrum.

(This includes infrared (IR), ultraviolet (UV), and visible.)

Random Sample 91.1311

A set of individuals that is taken from a population in such

a way that each possible individual in the population has an

equal chance of being selected.

Random-Effects Model 91.1497

A speciﬁc experimental treatment whereby a random

sample is taken from a large population of treatments in

such a manner that the conclusions reached can be

extended to the entire population and the inferences are not

restricted to the experimental levels.

Randomization 91.1309

The random selection of experimental runs in order to

minimize biases that are due to unknown or uncontrollable

factors in an experimental design.

Randomness 91.1310

A situation in which any individual event has the same

mathematical probability of occurring as does all of the

other events within the set of events.

Rebond 74.1312

A termination made at, on top of, or adjacent to, the loca-

tion of a prior bond.

Receptacle Connector 37.1313

The ﬁxed or stationary half of a two-piece connector pair

that mates with a plug connector.

Reciprocity Failure 91.1314

The deviation from the Reciprocity Law.

Reciprocity Law 91.1498

A general law that pertains to photo-chemical reactions that

states the mass of photoproduct from such a reaction is

determied simply by the total exposure involved.

June 1996 IPC-T-50F

Rectangular Leads 36.1764

A lead form or leg shape whose cross section is rectangu-

lar in shape.

Reduction Marks 22.1316

A set of stylized patterns in the border area of an artwork

between which the photographic-reduction dimension is

deﬁned.

Reed 44.1230

A thin comb made of pressed steel wires between which

warp ends are drawn after passing through the needle eyes.

Reference Dimension 26.1231

A dimension without a tolerance that is used only for infor-

mational purposes that does not govern inspection or other

manufacturing operations.

Reference Edge 22.1232

The edge of a cable or conductor from which measure-

ments are made.

Reference Hole 22.1233

see ‘‘Tooling Hole.’’

Reference Master 24.1234

Artwork that is free of defects.

Reflection, Signal 21.1499

The portion of the electrical energy that is sent back toward

its source because the signal encountered a change in

impedance in the transmission line on which it is traveling.

Reflow Soldering 75.1500

The joining of surfaces that have been tinned and/or have

solder between them, placing them together, heating them

until the solder ﬂows, and allowing the surface and the sol-

der to cool in the joined position.

Reflow Spike 75.1235

The portion of the reﬂow soldering process during which

the temperature of the solder is raised to a value that is

sufficient to cause the solder to melt.

Regardless of Feature Size 22.1236

A geometric tolerance or datum reference that applies at

any increment of size of a feature that is within its size tol-

erance.

Registered Production Master 24.1237

A production master that incorporates physical registration

features.

Registration 50.1240

The degree of conformity of the position of a pattern (or

portion thereof), a hole, or other feature to its intended

position on a product.

Registration Mark 22.1315

A stylized pattern (symbol) that is used as a reference point

for registration.

Regression Analysis 91.1241

The use of statistics to investigate and model the relation-

ships between parameters and results.

Reliability 90.1501

The probability that a component,device, or assembly will

function properly for a deﬁnite period of time under the

inﬂuence of speciﬁc environmental and operatinal condi-

tions.

Removable Contact 37.1242

A type of connector contact that is not permanently

retained within the connector body or insert.

Render True Color 24.1243

The color aberrations of an optical system that have been

sufficiently corrected so as to allow a magniﬁcation device

to resolve the required details.

Repair(ing) 77.1502

The act of restoring the functional capability of a defective

article in a manner that recludes compliance of the article

with applicable drawings or speciﬁcations.

Repeat Set-Up Time 92.1244

The set-up time for a unit that is identical to one previously

evaluated.

Repeatability (Accept/Reject) Decisions 91.1503

The percentage of features that show the same acceptance

or rejection status on a minimum of three consective tests

using identical operating modes and conditions in a

statistically-signiﬁcant random sampling of three units.

Residue 76.1245

Any visual or measurable form of process-related contami-

nation.

Resin 40.1246

A natural or synthetic resinous material. (See also ‘‘Rosin’’

and ‘‘Synthetic Resin.’’)

Resin Flux 75.1247

A resin and small amounts of organic activators in an

organic solvent.

Resin Recession 60.1504

The presence of voids between the plating of a plated-

through hole and the wall of the hole as seen in microsec-

tions of plated-through holes that have been exposed to

high temperatures. (See Figure R-1.)

IPC-T-50F June 1996