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Pulsed electroacoustic (PEA) method was applied as a nondestructive method to detect electrochemical migration in a sheet of epoxy resin and a sheet of laminate consisting of the same resin and a paper/phenol-resin composite. A significant decrease in the amount of negative charge was observed at the interface between the resin and the composite when the sample was the laminate. This is assumed to...
Pulsed electroacoustic (PEA) method is applied as a nondestructive technique to detect ion migration that progresses to the thickness direction in insulation composites for printed circuit boards. In both cases of a paper/phenol-resin composite and a glass/epoxy-resin composite, penetration of Cu migration into the bulk after aging was confirmed. Namely, a shift of the peak location of positive charge,...
For electromagnetic (EM) disturbances in vehicle-mounted radios, the main source is known to be conducted noise currents flowing through wiring-harnesses from vehicle-mounted multi-layer printed circuit boards (PCBs). To investigate a design method that can suppress the conducted noise currents, we previously measured noise current outflows from four types of simple three-layer PCBs having two perpendicular...
Electromagnetic disturbances for vehicle-mounted radios can be caused mainly by conducted noise currents flowing out from vehicle-mounted multi-layer printed circuit boards (PCBs) to wire-harnesses. Using actual electronic equipment for vehicles, we previously showed that combining, not separating, the ground layer patterns of a digital circuit and an analog circuit is more advantageous to reduce...
Conductive noise currents flowing out from vehicle-mounted electronic equipment composed of multi-layer printed circuit boards (PCBs) to wire-harnesses form a major disturbance source for vehicle-mounted radios. Using actual vehicle-mounted electronic equipment, we previously showed that, to reduce the noise current outflow of this type, combining, not separating, the ground layer patterns of a digital...
With the progress of printed circuit technology, the reliability of bulk insulation has become important, as well as that of surface insulation, particularly in multilayer boards and embedded boards. We observed the space charge behavior of various insulating materials used in printed circuit boards, and found that internal charges move in aramid/epoxy specimens under dc electric fields. The electric...
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