Browse Prior Art Database

Stepping Head for High Density Memory Tester

IP.com Disclosure Number: IPCOM000090487D
Original Publication Date: 1969-Apr-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Grisley, FG: AUTHOR

Abstract

A stepping head for a high density memory plane testing unit is made on block 10. Overlay 12 is formed from a double-lamination of copper foil with dielectric film. One layer of copper is etched into strip lines 14. The other layer 16 forms a ground plane for correct impedance matching. Strip lines 14 take the place of mechanical probes and are at the same pitch spacing as the lines on the memory plane to be tested.

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Stepping Head for High Density Memory Tester

A stepping head for a high density memory plane testing unit is made on block 10. Overlay 12 is formed from a double-lamination of copper foil with dielectric film. One layer of copper is etched into strip lines 14. The other layer 16 forms a ground plane for correct impedance matching. Strip lines 14 take the place of mechanical probes and are at the same pitch spacing as the lines on the memory plane to be tested.

Drawing 1 shows overlay 12 bonded onto the block 10 with shallow depression 44 immediately behind the line ends. Air pressure from source 42 can be admitted to the space so formed by way of needle valve 18. Small hole 20 in the part of overlay 12 forming a diaphragm allows the air to escape.

Drawing 2 shows stepping head 22 mounted in the tester. The position in which the head is shown is halfway between index positions, i.e., the contacts are lifted well clear of memory plate 40 being tested. As hole 20 is not obstructed, any air leaking past valve 18 escapes to the atmosphere. Valve 18 is adjusted to allow such a flow while avoiding an increase in pressure behind the diaphragm. Coaxial cable 24 is connected to lines 14 on the stepping head. The stepping head is moved along the testing unit by an indexing lead screw 26 contained in housing 28. The unit also includes head tilting cam 30. When the stepping head is at an index position, cam 30 tilts the head and the contact of the head with the memory plane s...