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Article Excerpt
The TRW Automotive Machine Building Div., Body Control Systems (Winona, MN), has in many situations replaced soldering the electrical cables from the car directly to the printed circuit boards (PCB). The approach now is to use "compliant pin" connection, wherein the electrical connection is through an array of needle-sized eyelets that collapse when the mating connector on the cable is press fit to the PCB. To monitor that press fit operation, TRW Automotive uses a linear voltage displacement transducer (also called linear variable differential transformer, LVDT), a load cell, and other instrumentation to measure force and displacement. If one of those needle pins is bent or closed slightly, the sensor system will detect a higher force than acceptable. Conversely, if the eyelets on the PCB side are too open, which would cause a loose and inferior connection,...
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