> Take a bare board, locate an accessible trace with a via and apply a 
> current limited supply to it, preferably at say 1 amp.  Then take a 
> voltmeter and measure the drop along the trace.   This will give you at 
> least a ballpark idea of what the resistance is across the via and thus 
> what the I2R losses might be approximately.
also if you have a board that is scrap anyway you could use it for some destructive via testing, take your standard via and crank up the current through it until you vaporise something.


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