Surface Leakage

The passage of current over the boundary surface of an insulator as distinguished from passage through its volume.

Surface Leakage

Surface Insulation Resistance(SIR)

A measure in ohms of an insulating material’s (as in FR-4) electrical resistance between conductors.

Surface Insulation Resistance(SIR)

Surface Insulation Resistance(SIR)Test

Test for the level of resistance of an insulating material, such as FR-4.between conducting members of a board (traces, contacts).

Surface Insulation Resistance(SIR)Test

Supported Hole

A hole in a printed board that has its inside surface plated or otherwise reinforced.

Supported Hole

Subtractive Process

A process for obtaining conductive patterns by selective removal of unwanted areas of conductive foil from a metal clad base material.

Subtractive Process

Substrate

See Base Material.

Substrate

Stripline

A type of transmission line configuration which consists of a single narrow conductor parallel and equidistant to two parallel ground planes.

Stripline

Strain

The deformation resulting from a stress.

Strain

Straight-through Lead

A component lead that extends through a hole and is terminated without subsequent forming.

Straight-through Lead

Step-and-repeat

A method by which successive exposures of a single image are made to produce a multiple-image production master.

Step-and-repeat

Step Soldering

The making of solder connections by sequentially using solder alloys with successively lower melting temperatures.

Step Soldering

Statistical Process Control(SPC)

The use of statistical techniques to analyse the outputs of processes with the results guiding actions taken to adjust and/or maintain a state of quality control.

Statistical Process Control(SPC)

Stamped Printed Wiring

Wiring which is produced by die stamping and which is bonded to an insulating base.

Stamped Printed Wiring

Spurious Signal

See Cross-talk.

Spurious Signal

Solidus

The highest temperature at which filler metal(Solder) is completely solid.

Solidus

Solderless Wrap

A method of connecting a solid wire to a square, rectangular, or V-shaped terminal by tightly wrapping the wire around the terminal with a special tool.

Solderless Wrap

Soldering

 A process of joining metallic surfaces with solder, without the melting of the base metals.

Soldering

Soldering Iron Tip

The portion of a soldering iron that is used for the application of the heat that melts the solder.  

Soldering Iron Tip

Solderability

The ability of a metal to be wetted by molten solder.

Solderability

Solderability Testing

The evaluation of a metal to determine its ability to be wetted by solder.

Solderability Testing

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