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Ideally, lead connections from your power supply to your load have no resistance. In reality, lead resistance increases with lead length and wire gauge. When a power supply delivers current through the connecting cables, the voltage may decrease at the load. To compensate, you can use remote sensing to correct for the voltage drop.
Remote or 4-wire sensing uses two pairs of cables: the first pair as the load leads, the second pair as the sense leads. The sense leads measure the voltage at the load. The power supply increases or decreases its output voltage based on voltage measurements at the load, compensating for any losses in the load leads.
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