Understanding Manufacturing Tolerances on a PCB - Tolerances on Copper Thickness - Eurocircuits
Understanding Manufacturing Tolerances on a PCB - Tolerances on Copper Thickness - Eurocircuits
Copper thickness on a PCB is influenced by many factors including base material tolerances, copper balance, plating index, the galvanic process etc.
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A copper sheet of thickness 2L = 2 mm has an initial temperature of T = 118°C. It is suddenly quenched in liquid water, resulting in boiling at its two surfaces. For boiling, Newton's law of cooling is expressed as q = h(T - Tsat), where T is the solid surface temperature and Tsat is the saturation temperature of the fluid. In this case, Tsat = 100°C. The convection heat transfer coefficient may be expressed as h = 1010 W/mK(T - Tsat). Determine the time needed for the sheet to reach a tempera
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