Thermocouple

A device made of two dissimilar metals which, when heated, generate a voltage that is used to measure temperatures.

Test Point

Special points of access to an electrical circuit, used for testing purposes.

Test Pattern

A pattern used for inspection or testing purposes.

Test Fixture

A device that adapts a specific assembly under test system via inter-connection.

Test Coupon

A pattern as an integral part of the PCB on which electrical tests may be made to non-destructively evaluate process control. A portion of a circuit used exclusively to functionally test the circuit as a whole.

Test Board

A printed board suitable for determining acceptability of the board or of a batch of boards produced with the same process so as to be representative of the production board.

Terpenes

(Turpentine)A solvent used in cleaning electrical assemblies.

Termination

The part of component that makes contact with a pad on a substrate.

Terminal Area

A portion of a conductive pattern usually, but not exclusively, used for the connection and/or attachment of components.

Tenting

A printed board fabrication method of covering over plated through-holes and the surrounding conductive pattern with a resist, usually dry film.

Tented Via

A via with solder mask completely covering both its pad and its plated through-hole. This completely insulates the via from foreign objects, thus protecting against accidental shorts, but it also renders the via unusable as a test point.

Temperature Profile

The depiction of the temperature that a selected point traverses as it passes through the re-flow process.

Teflon

Du Pont trade name as an inventor for PTFE(Polytetrafluoroethylene).

Taped Components

Components attached to continuous tape for automatic assembly.

Tape-and-reel

A packaging method of housing surface-mount parts in their own tape cavities in a long continuous strip. The cavities are covered so that the tape can be wound around a reel for convenient handling and machine set-up.

Swaged Lead

A component lead wire that extends through a hole in a printed board and its lead extension is flattened(swaged)to secure the component to the board during manufacturing operations.

Surfactant

A chemical added to the cleaning solution to lower surface tension and to promote wetting.

Surface Tension

The natural, inward, molecular attraction force that inhibits the spread of a liquid at its interface with a solid material.

Surface Mounting

The electrical connection of components to the surface of a conductive pattern that does not utilize component holes.

Surface Leakage

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

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