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Assuming it's an homemade board, a PCB can only have two different faults: An overetched trace, i.e. an interrupted trace; you say you have to ruled out this An underetch, i.e. two adjacent traces shorted …

I would put a machined guard around the pulse oximeter to keep the surface from it at about 0.2-0.3 (if it is and SMD part soldering height tolerance is about 0.2mm) and then simply screw down the res …

Also no broken edges or cracks in the substrate (done usually by the pcb manufacturer) Bare board electrical testing (that's the official name): correct on the procedure. …

The datasheet explicitly says that it's a multichip component so they are literally two separate darlingtons on two different dies. There's nothing joining them inside. Just do whatever you want, you …

You can design your isolator as discrete, just use suitable capacitors (especially with regard with pin clearance and dielectric failure modes) and it's a learning experience. SPICE is fine for simula …

That is a card-edge connector, wide pitch (you can measure it). Quite popular in the 70-80. Well, the current PCIe and the memory slots in PCs are based on the same technology so it would be more corr …

If the module isn't mounted flush with the board and can actually moved by hand it can surely be a reason for a vibration failure. Copper is horrible when repeatedly flexed. I'd suggest to strain reli …

Well, I doubt the SIM itself is rated for -20°C unless it's really well made. It could also be a case that the sim being a low power device simply didn't ``compute'' correctly at such a low temperatur …

You have two crucial issues here: Current handling (track ampacity) and Insulation (track spacing) The first one is easy, there are graphs/table to design that. You didn't say how much copper are yo …

What you are asking for is the 'component footyard' which is defined in IPC7351B (soon to be updated… for something like 5 years) As already answered at the end it boils down to your fabrication capab …

For PCB measurement you are usually interested in impedance at high frequencies (since at low frequency a PCB is small enough to not pose a problem). …

It is actually a big problem. Often the same part is marked differently by different manufacturers an most of the 'short' markings have nothing to do with the actual component part number. For example …

In principle bigger is better but we are talking about a GHz signal here (I don't remember the exact frequency); since we are not talking about short antennas (in the electrical sense) I think that ma …

As far as I know IPC is mostly interested on the assembly/testing part of the electronic lifecycle. They say, for example, the best way to make fabricable boards, various kind of materials/coating, a …

It actually gets even nastier: if you coat the board the clearance become different (and creepage somewhat 'disappears', and pollution level decreases). The reason for different columns is that you ca …