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Are PCB traces insulated?
PCB substrate materials must be made of substances that do not conduct electric currents, as this will interfere with the path of electricity as it travels through the printed wires. In fact, the substrate materials are PCB insulation that functions as a laminated electrical insulator for the circuitry of the board.
What is PCB board testing?
PCB testing, or printed circuit board testing, begins with understanding that the PCB is the foundation for any printed circuit assembly (PCA). The circuit board is a top quality product that should not cause your end product to cost you money due to failures and recalls.
What causes corrosion on a PCB circuit board?
Don’t let water end your circuit boards. Electrolytic corrosion occurs when neighboring traces become contaminated by an ionic liquid or electrolytic solution. Small slivers begin to grow between the two traces. If the contaminant is water, metal oxides and hydroxides will start to grow on the exposed metal.
What’s the best way to test a PCB?
Flying probe testing is a tried-and-true option that’s less expensive than in-circuit testing. It’s a nonpowered type of test that checks for: The test works through the use of needles attached to a probe on an x-y grid obtained from basic CAD. Your ECM programs coordinates to match the circuit board and then runs the program.
What kind of metal can you lay PCB traces on?
Copper and other base metals corrode rather easily, while noble metals and some alloys are highly resistant to corrosion. Some manufacturers can lay PCB traces using gold or gold-nickel alloy.
Where can I find creep corrosion on my PCB?
Creep corrosion was found on PCBs supplied by 5 different vendors and included the two major ImAg chemistries. Thus it was quickly determined that this was not a supplier contamination issue. The first evidence of the vulnerability of ImAg surface finish in industrial environments was documented by Veale from Rockwell [3].