Module CM1, one of the side modules of KAVOSH T-111, is designed to measure transmission line and cable impedance. Moreover, using this equipment earthing system impedance, step voltage, touch voltage and transfer voltage in a substation are measured. In order to decrease the effect of noises in environment, all measurements can be done in a wide range of frequency bands. A transformer is placed inside of the module for impedance matching with transmission line impedance and as a result power transfer is maximized.