Flow Soldering

Also called wave soldering. A method of soldering printed circuit boards by moving them over a flowing wave of molten solder in a solder bath.

Flow Soldering

Flood Bar

A device on a screen printer that drags solder paste back to the starting point after the squeegee has made a stroke. The return is for set-up of the next stroke as it does no printing on the backstro...

Flood Bar

Flexure Failure

A conductor failure due to repeated flexing which is indicated by an increase of resistance to a specified value for a specified time.

Flexure Failure

Flexible Printed Wiring

A random arrangement of printed wiring utilizing flexible base material with or without flexible cover layers.

Flexible Printed Wiring

Flat Cable

 A cable with two or more parallel, round or flat, conductors in the same plane encapsulated by an insulating material.

Flat Cable

Fixture

A device that enables interfacing a printed circuit board with a spring-contact probe test pattern.

Fixture

First Pass Yield

The per centage of finished assemblies to pass all tests without re-work.

First Pass Yield

Finger

A gold-plated terminal of a card-edge connector.

Finger

Fine Pitch

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Fine Pitch

Fine Line Design

 Printed circuit design permitting two, and nowadays even three, traces between adjacent dip Pins. It entails the use of photo-imageable solder mask (PISM).

Fine Line Design

Fillet

 The concave formation of soldified solder between the land or pad and the component lead.

Fillet

Fiducial

 A mark both in the artwork and etched with the circuit traces of the PCB. It is used to identify artwork orientation on the board. Global fiducials locate the overall pattern; local fiducials pi...

Fiducial

FICS

 Flashscan Image Control Software: A DOS Program which sends Gerber files to the plotter.

FICS

Fibre Exposure

A condition in which broken reinforcing fibres of the base material are exposed and protrude in machined or ab...

Fibre Exposure

Feed-through

 A plated through-hole in a printed circuit board that is used to provide electrical connection between a trac...

Feed-through

Fault List

A listing of shorts and opens on a PCB to be repaired.

Fault List

Eyelet

A hollow tube inserted in a terminal or printed board to provide mechanical support for component leads or ele...

Eyelet

Extraneous Copper

Unwanted copper remaining on the base material after chemical processing.

Extraneous Copper

Exotherm

The characteristic curve of a resin during cure showing reaction of temperature vs. time.

Exotherm

Etching

Removal of metal from the surface of PCB by chemical dissolution. The process is normally carried out selectively&n...

Etching

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