Electrical Testing & Troubleshooting Basics - Ch19

Electrical Testing & Troubleshooting Basics - Ch19 -...

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Unformatted text preview: Electrical Testing (Ch 19) & Troubleshooting Basics Electrical testing – electrical functional guarantee of a component, board, device or system. Troubleshooting – systematic, analytical process of determining the cause of electrical functional failure. Electrical Testing – Ch 19 ¡ Why do electrical testing? ¢ During fabrication defects (opens & shorts) may occur. ¢ Components may not meet specs due to poor process control. ¢ Damage may occur during handling and transfer. Electrical Testing – Ch 19 ¡ Si wafers, components (such as ICs), PWBs and systems are tested at each phase of the manufacturing and assembly process. ¡ Can account for as much as 45% of total product cost. Electrical Testing – Ch 19 ¡ Starts with design ¢ Design simulation (Pspice) ¢ Design for test (zero ohm resistor - 157) ¢ Built in self test (computer bootup) ¡ Components ¢ Functional test (“burn-in”) ¡ PWB ¢ Interconnect test (ohm measurement) Electrical Testing – Ch 19 ¡ Assembled board ¢ Functional test ¡ Verification of all circuit functionality ¡ Not practical for complex circuits ¢ Structural test ¡ Verification circuit is constructed as designed ¡ Complex circuits tested piecemeal fashion ¡ Does not directly demo circuit functionality ¢ Often structural & partial functional test Electrical Testing – Ch 19...
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This note was uploaded on 04/02/2008 for the course IME 156 taught by Professor Perks during the Fall '07 term at Cal Poly.

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Electrical Testing & Troubleshooting Basics - Ch19 -...

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