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The regular spacing and sheer amount of holes in that image is a bit unusual, but I nevertheless suspect that most or all of them are vias: holes drilled through multiple layers of the PCB and plated with copper on the inside to provide an electrical connection between layers. A large number of regularly spaced vias in contiguous planes may be used to spread ...


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RMS means square mean root . i.e. take square add and take mean then take square root. If you take square of ac i.e. sinusoidal waveform the parts from $0$ to $\pi$ become identical to the part between $\pi$ to $2.\pi$. Hence if you add from $0$ to $n.\pi$ and divide by n you will essentially left with one lobe. That's why you can only use one lobe to get ...



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