Micro-resistance measuring device and method by adopting fixed low-current excitation

The embodiment of the invention provides a micro-resistance measuring device and method by adopting fixed low-current excitation, and relates to the technical field of electronic measurement. The method comprises the steps that a current sampling circuit acquires a first voltage signal, wherein the first voltage signal is generated at two ends of a known resistor after the constant current passesthrough the known resistor; a voltage sampling circuit is used for acquiring a second voltage signal, wherein the second voltage signal is generated at two ends of the resistor to be measured after the constant current passes through the resistor to be measured; and a processor is used for recording the resistance value of the known resistor, converting the first voltage signal into a first current signal, and calculating the resistance value of the resistor to be measured according to the acquired first current signal and the acquired second voltage signal. The device adopts 10mA fixed low-current excitation, can rea