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STANDARDIZED TEST PAD ARRAYS FOR P.C. BOARDS

IP.com Disclosure Number: IPCOM000005570D
Original Publication Date: 1985-Oct-01
Included in the Prior Art Database: 2001-Oct-16
Document File: 2 page(s) / 70K

Publishing Venue

Motorola

Related People

Phil Vosskuhler: AUTHOR

Abstract

It is common, place in the electronics art to test PC. boards either before or after the insertion of components by placing them on a bed-of-nails test fixture. A mask or gasket plate is used to customize the typical universal bed-of-nails test fixture for each particular PC. board. Because of the great variety of test pad locations which are used on present day PC. boards, bed-of-nails test fixtures are notoriously difficult and expensive to construct and maintain.

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MOTOROLA Technical Developments Volume 5 October 1985

STANDARDIZED TEST PAD ARRAYS FOR PC. BOARDS

by Phil Vosskuhler

   It is common, place in the electronics art to test PC. boards either before or after the insertion of components by placing them on a bed-of-nails test fixture. A mask or gasket plate is used to customize the typical universal bed-of-nails test fixture for each particular PC. board. Because of the great variety of test pad locations which are used on present day PC. boards, bed-of-nails test fixtures are notoriously difficult and expensive to construct and maintain.

   Many of the problems associated with testing PC. boards on bed-of-nails testers may be avoided by rearrang- ing the layout of the PC. boards so that standardized test pad arrays are provided in one or more centralized loca- tions. Fig. 1 is a conceptual sketch of a PC. board 10 containing a number of integrated circuits 11 and a standardized centrally located array 12 of test pads 13. On larger and more complex boards multiple arrays of test pads can be used in specified standard locations.

   It is important that the number, location, and arrangement of pads within the test pad array be standardized for different size boards. In this way a single test fixture can handle many different board types which use the same test pad array, even though the individual components and circuitry on the boards are quite different. This results in a substantial saving in test fixturing cost and improve...