Very often I see high wire gauges (i.e., very thin cables) used for the wires that connect a test circuit's voltage input terminals to the sense screws of a power supply. I would have thought that you would want to use very thick low resistence cables to get an accurate read at the sense screws of the actual voltage that the circuit is getting.
It seems to me that by using thin wires of any length you are introducing parasitic resistence into the equation and skewing the voltage that the sense screws are receiving. Yet this seems to be common practice, thick cables for the power cables coming out of the supply and much thinner cables for the two sense connections.
What is the reasoning behind this?