The functionality of an AC resistance (impedance) bridge can be obtained simply by interconnecting reference voltage output (Sine Out) and voltage sensing inputs of a lock-in amplifier with the corresponding inputs and outputs of the AMS220, while the tested resistance is connected to the AMS220. The excitation current provided by the AMS220 is then proportional to the reference voltage provided by the lock-in amplifier and switch-programmable voltage-to-current conversion factor of the AMS220. Connection of the AMS220 in the configuration replacing the AC resistance bridge and the principal block diagram of the signal wires and signal wire shields connected to the AMS220 are schematically shown in Fig. 1 and Fig. 2, respectively.