30 June 2003 Run2b Readout Meeting Qun Yu / Moreshwar Dhole Louisiana Tech University DJC Testing at LaTech: Update.

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Presentation transcript:

30 June 2003 Run2b Readout Meeting Qun Yu / Moreshwar Dhole Louisiana Tech University DJC Testing at LaTech: Update

30 June 2003 Run2b Readout Meeting Qun Yu / Moreshwar Dhole Louisiana Tech University Quality Control Tests of DJC’s 1.Continuity and shorts test 2.Resistance testing 3.High voltage standoff testing. LaTech Testing Crew: Moreshwar Dhole Qun Yu Matthew Bellot Justin Beam

30 June 2003 Run2b Readout Meeting Qun Yu / Moreshwar Dhole Louisiana Tech University 1) Continuity and Shorts tests Performed to check the continuity of Cu traces inside the flex cable. Discontinuities in Cu traces may exist due to manufacturing defects or mishandling. There are 50 lines in each cable. Continuity and short circuit tests are conducted for each line. Tools and equipments: digital multimeter, continuity testing stand

30 June 2003 Run2b Readout Meeting Qun Yu / Moreshwar Dhole Louisiana Tech University Test procedure: Continuity: two multimeter probes are connected to both ends of the line in a given cable, if the line is good, there will be “beep” from multimeter. Short circuit tests: each line is tested against the other lines with higher label number. For example, line 1 will be tested against line 2, line 3, …, line 50; line 2 will be tested against line 3, line 4, … line 50, and so on. So far we have tested 12 cables, and all of them are good.

30 June 2003 Run2b Readout Meeting Qun Yu / Moreshwar Dhole Louisiana Tech University Picture of Readout Board

30 June 2003 Run2b Readout Meeting Qun Yu / Moreshwar Dhole Louisiana Tech University 2) Cable Resistance Testing: Purpose of resistance testing is to see whether all the Cu lines in the Digital Cable have uniform and expected low resistance values. To find effective cable resistance, readout board resistance is subtracted from total resistance reading on micro ohmmeter (Total resistance = Readout board resistance + Resistance of cable + resistance of connectors and wires used for testing). A Valhalla Scientific 4300B Digital Micro-ohmmeter is used to measure the resistance of the 50 lines. The digitized resistances are written to a PC.

30 June 2003 Run2b Readout Meeting Qun Yu / Moreshwar Dhole Louisiana Tech University Digital Jumper Cable Readout Setup:

30 June 2003 Run2b Readout Meeting Qun Yu / Moreshwar Dhole Louisiana Tech University 3) High Voltage Standoff Test: The purpose of this test is to check whether there is any short or current leakage (Arcing) between HV (High Voltage) Cu trace and other adjacent Cu traces. For this testing here at LaTech we developed our own High Voltage Testing Jig and it is working fine. This High Voltage Testing Jig allows us to test 10 cables at a time for overnight.

30 June 2003 Run2b Readout Meeting Qun Yu / Moreshwar Dhole Louisiana Tech University High Voltage Test Schematic

30 June 2003 Run2b Readout Meeting Qun Yu / Moreshwar Dhole Louisiana Tech University Complete Test Setup:

30 June 2003 Run2b Readout Meeting Qun Yu / Moreshwar Dhole Louisiana Tech University Some data from tests of Century Test Cables are shown on the next two slides:

30 June 2003 Run2b Readout Meeting Qun Yu / Moreshwar Dhole Louisiana Tech University

30 June 2003 Run2b Readout Meeting Qun Yu / Moreshwar Dhole Louisiana Tech University