October 15, 2004GLAST Project Results of 1 st Run P.A. Test Fixture LATLAT 1 RESULTS OF 1 st RUN PITCH ADAPTER TEST FIXTURE Peter Amnuaypayoat

October 15, 2004GLAST Project Results of 1 st Run P.A. Test Fixture LATLAT 2 Equipment Set-Up of Pitch Adapter Testing CONNECTOR SAVER TEST FIXTURE ZEBRA CONNECTOR GROUND LEAD STORAGE CASE MCM WITH PITCH ADAPTER SOFTWARE/ ELECTRICAL FIXTURE

October 15, 2004GLAST Project Results of 1 st Run P.A. Test Fixture LATLAT 3 Initial Issue of Test Fixture Zebra Connector did not have proper conductivity with Zebra Connector Mount –Tested Zebra Connector with Ohm meter Zebra Connector : 100 Ohms –Tested Zebra Connector Mount w/ Ohm meter Zebra Connector Mount: 1 Ohm Zebra Connector Mount has Alodine surface on all three contact faces of Zebra Connector Initial run did not have any connection between Zebra Connector and Zebra Connector Mount. –From testing with an Ohm meter, we found that a connection could be made with a large amount of force being applied to the Zebra Connector. –This force was too much for the Test Fixture to be capable of, and presumably too much for the Pitch Adapter to handle. Zebra connector Mount Zebra Connector

October 15, 2004GLAST Project Results of 1 st Run P.A. Test Fixture LATLAT 4 Quick Solution for Issue to Continue Testing Switched to alternate Zebra Mount with deeper Zebra Connector slot Applied a thin non-coated conductive wire between the Zebra Connector and Zebra Connector Mount Connected the “sandwiched” wire, directly to the grounding lead Applied enough force to the Zebra Connector to have contact with conductive wire

October 15, 2004GLAST Project Results of 1 st Run P.A. Test Fixture LATLAT 5 Test Results of 1 st Run Pitch Adapter Test Fixture Tested 5 different MCM’s, including 2 with no bad traces (according to Visual Inspection). – 2 tall MCM’s – 3 short MCM’s Test Software was able to count amount of disconnected channels/traces and give there location. – Delta’s (additional disconnected channels) of Trial runs were NOT visually inspected for each MCM Additional disconnected traces/channels were assumed to be nonconductive points between the Zebra Connector and the Conductive wire Additional disconnected traces/channels could also be disconnected/malfunctioning chips? – Delta of disconnected channels were not always in the same location. Conclusion of 5 test runs: – Connection between Zebra Connector and Conductive wire was not consistent – Wire was may have been too stiff and therefore contained “kinks” that allowed nonconductive points between the Zebra Connector and Conductive wire – Presumed: if connection between Zebra connector and ground lead were constant (complete connection throughout the entire strip), ALL Delta’s of trial runs would equal 0 FIRST RUN PITCH ADAPTER TEST RESULTS MCM # OF BAD CHANNELS DETECTED FROM VISUAL INSPECTION # OF BAD CHANNELS DETECTED FROM P.A. TEST FIXTURE DELTA OF VISUAL INSPECTION AND TEST FIXTURE

October 15, 2004GLAST Project Results of 1 st Run P.A. Test Fixture LATLAT 6 Solutions for Zebra Connector to Zebra Connector Mount 1.Use a more conductive and pliable wire to be placed between the Zebra connector and the Zebra connector Mount 2.Use a Conductive Bond/Epoxy to bond the Zebra Connector into the slot of the Zebra Connector Mount –Heat required for Conductive Bond/Epoxy? –Zebra Connector may not be compatible with Conductive Bond/Epoxy 3.Apply “conductive foil” between the Zebra Connector and slot of the Zebra Connector Mount. Connect foil directly to ground lead. –Material? –Availability? –Thickness? 4.Modify Zebra Connector Mount to physically clamp down on Zebra Connector, therefore “Squeezing” the Zebra Connector and applying enough force to create a uniform connection –Machining required –New parts will need to be created

October 15, 2004GLAST Project Results of 1 st Run P.A. Test Fixture LATLAT 7 Objectives Covered by 1 st Run Test Pitch Adapter Test Fixture Proper connection of Zebra Connector to Pitch Adapter Fine adjustment of contact of Zebra connector to Pitch Adapter Fine adjustment of Pressure of Zebra connector to Pitch Adapter Ability to accept and test MCM while in new Burn-IN storage Case Works with Electrical test fixture and Software User Friendly and tool free Software Determines # amount of disconnected channels on Pitch Adapter Determines location ( which ladder) of disconnected channels New Burn-IN Storage Case ESD safe Accepts current Connector Saver Protection of MCM/no allowance of unwanted flexing Ease of handling and storage (lid removal and integration into the P.A. Test fixture) Reusable

October 15, 2004GLAST Project Results of 1 st Run P.A. Test Fixture LATLAT 8 Outcome of 1 st Run of Test Fixture Pitch Adapter Test Fixture mechanically performs as expected New Burn-IN Case and lid mechanically perform and function as expected Need to implement a better interface between the Zebra Connector and the Zebra Connector Mount Need to test New Burn-IN Case and lid for: – thermal cycling – Burn-IN AFTER THE FIRST TEST RUN OF THE P.A. TEST FIXTURE, I FEEL QUITE CONFIDENT THAT A BETTER INTERFACE FOR THE ZEBRA CONNECTOR WILL BE ATTAINED EASILY. AFTER THE IMPLEMENTATION OF A NEW INTERFACE, WE WILL TEST FOR ZERO DISCREPENCIES BETWEEN THE VISUALLY INSPECTED MCM’S AND THE TEST FIXTURE INSPECTED MCM’S. IF “ADDITIONAL DISCONNECTED TRACES/CHANNELS” ARE MALFUNCTIONING/DISCONNECTED CHIPS, THEN CURRENT SET UP IS FUNCTIONAL