Hi,
I see the words "Kelvin connection".. but honestly I can´t find out how this can be a Kelvin connection.
* I expect the signal to be prcessed internally - but I can´t see this.
* I expect it to be conected to R_L directly with an independent wire.
* I expect the lower end of R_L to be wired in Kelvin style, too.
So in my eyes it´s not a kelvin connection, not half, maybe a quarter Kelvin connection, with doubtful benefit.
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A Kelvin connetion usually is used to prevent from errors caused by voltage drops on wires with (high) current load.
But the voltage drop will be in the power path as well as it´s return path.
Thus a useful Kelvin system should be made with four wires.
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An example of true Kelvin wiring of a shunt resistor:
https://electronics.stackexchange.com/questions/349001/4-terminal-shunt-resistor
Klaus