What are the methods for measuring the equivalent resistance of a one port network?
Impressed voltage methodThe power supply is zero, the voltage source is applied on the network port, and the voltage and current of the port are measured. R=U/I. Characteristic (1).
Direct measurement methodThe power supply is zero (to remove the voltage source, instead of the current source by short line), and the network port resistance is directly measured with a meter (multimeter). The utility model is suitable for a network with small internal voltage source resistance and constant current source resistance, because the internal resistance of the power source is neglected.
Open circuit short circuit methodMeasure open circuit voltage Uoc and short-circuit current Isc, R=Uoc/Isc. Applies to Isc that will not exceed the power current rating, otherwise the short circuit will burn the power.
