Browse Prior Art Database

Signal and Via to Power Shorts Tester Utilizing a Compression Roller Test Probe

IP.com Disclosure Number: IPCOM000111054D
Original Publication Date: 1994-Feb-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 4 page(s) / 77K

Publishing Venue

IBM

Related People

Seward, M: AUTHOR [+2]

Abstract

Disclosed is a simple and inexpensive tester that can be used to test raw printed circuit panels and boards (Figs. 1-3). The type of testing suitable to this machine is signal lines and via pop-ups to power, shorts and leakage testing. This tester can also be used to test full sheet dielectric materials for embedded debris. This tester is superior to a conventional flat plate clam shell type of dielectric tester in that not only will it find the same defects, but will also indicate the defects location. Being similar to a clam shell type of tester it will usually be used to locate defects that are lodged in the "Z" direction of the panel, shorting a top surface net to an internal or bottom side power plane.

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Signal and Via to Power Shorts Tester Utilizing a Compression Roller
Test Probe

      Disclosed is a simple and inexpensive tester that can be used
to test raw printed circuit panels and boards (Figs. 1-3).  The type
of testing suitable to this machine is signal lines and via pop-ups
to power, shorts and leakage testing.  This tester can also be used
to test full sheet dielectric materials for embedded debris.  This
tester is superior to a conventional flat plate clam shell type of
dielectric tester in that not only will it find the same defects, but
will also indicate the defects location.  Being similar to a clam
shell type of tester it will usually be used to locate defects that
are lodged in the "Z" direction of the panel, shorting a top surface
net to an internal or bottom side power plane.  Generally this test
system is used for determining the quality of the separating
dielectric sheets and via barrel to power plane isolation.

      The tester consists of a metal roller approximately 5/8" in
diameter, cut to length to cover the testable area of the product
under test.  The roller ASM is suspended on a spring loaded swing arm
at each end.  A pair of roller or ball bearings are fitted to the
ends of the roller to allow it to spin freely.  This assembly is then
mounted to a moveable stage by way of a pair of isolating non-metal
blocks (Fig. 4).  The roller is connected to one side of a shorts
detection meter or megohmmeter and the other side of the met...