Making Sense of Two-Wire Current-Sense Resistors

An FEA model of a two-wire current sense resistor mounted to a PCB

Using a simple, but precise test set up, measurements are taken on a 1-m? 5% metal-foil current-sense resistor mounted to a small PCB. These measurements enable development of a finite element analysis model, which provides insights into the PCB’s influence over the resistor’s actual value in an application and what steps designers can take to obtain the desired or specified value.

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