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Browse Prior Art Database

Electrical Isolation Tester

IP.com Disclosure Number: IPCOM000103294D
Original Publication Date: 1990-Sep-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 1 page(s) / 40K

Publishing Venue

IBM

Related People

Makhijani, MP: AUTHOR [+2]

Abstract

This apparatus is designed to test defects of an anodic oxide conversion coating applied to an aluminum heat conductive finned cooling hat.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 98% of the total text.

Electrical Isolation Tester

      This apparatus is designed to test defects of an anodic oxide
conversion coating applied to an aluminum heat conductive finned
cooling hat.

      The coating provides electrical isolation.  This tester
discerns anomalies in the coating that may cause electrical shorting
between intermeshing surfaces of hat and insert.

      Insulated bushings are pressed into a thick copper plate in an
array to match the aluminum heat conductor array.  Each bushing has a
low voltage LED inserted from one end, with one terminal brought out
and soldered commonly to the copper plate.  The second terminal is
placed in contact with a copper slug and is firmly pushed into the
bushing from the other side.

      During testing, the apparatus is fixed horizontally with the
array of LEDs facing up.  The anodized hat is assembled with all the
copper inserts and placed on the test platform so that the insert
array is exactly below the test slug array.

      A low voltage supply is connected between the test apparatus
and platform.  The platform is then actuated upward to establish
contact between surfaces of the copper channels and aluminum heat
sink.

      The results are instantaneous.  An acceptable electrical
isolation condition would be indicated by no lighting of any one LED.
An energized LED indicates an electrical short between the insert and
hat at this location.  The location is recorded for subsequent
rework.

      Di...