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Adjustable Backer Plate for Logic Card Testing

IP.com Disclosure Number: IPCOM000042445D
Original Publication Date: 1984-May-01
Included in the Prior Art Database: 2005-Feb-03
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Knudson, JE: AUTHOR [+2]

Abstract

An adjustable pin backer plate is provided for logic card testing, such as nodal impedance tests. The device is shown in Fig. 1. Card assembly 1 is placed on backer plate 2 using guide pins 7 for alignment. Retainer 8 is adjusted in or out, as required, to assure a good fit. With the card assembly in place on the backer plate, usually provided, it should be in-line with pogo pins (bed of nails) and ready to run a clean continuity test. However, some cards are built in such a way that they have a tendency to be misaligned under nominal conditions. An adjustable backer plate 2 eliminates this condition. Two adjustable insert assemblies 3 are provided. One of these is shown in Fig. 2. With the card assembly in place, guide pins 7 are mounted in an insulated sliding track 3 which moves in two directions.

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Adjustable Backer Plate for Logic Card Testing

An adjustable pin backer plate is provided for logic card testing, such as nodal impedance tests. The device is shown in Fig. 1. Card assembly 1 is placed on backer plate 2 using guide pins 7 for alignment. Retainer 8 is adjusted in or out, as required, to assure a good fit. With the card assembly in place on the backer plate, usually provided, it should be in-line with pogo pins (bed of nails) and ready to run a clean continuity test. However, some cards are built in such a way that they have a tendency to be misaligned under nominal conditions. An adjustable backer plate 2 eliminates this condition. Two adjustable insert assemblies 3 are provided. One of these is shown in Fig. 2. With the card assembly in place, guide pins 7 are mounted in an insulated sliding track 3 which moves in two directions. The track may be adjusted independently of the backer plate. Therefore, the adjustment covers all directions. Indexing wheels 4 (Fig. 3) provide accurate control of position. Zero location equals nominal conditions. When the wheel is turned clockwise, movement is to the rear. Counterclockwise rotation results in movement to the front. Typically, a » turn of a wheel = .008 of an inch in either direction. Two yoke-detents 5, such as that shown in Fig. 4, secure indexing wheel 4 and detent 6 mounted to backer plate 2 with screws. Two detent-steel nose spring plungers 6 function as locking mechanisms and also indicate the di...