Device for measuring electric current crossing surface for measuring leakage currents for telecommunication systems, has low pass filter that is utilized for extracting coil current signal that is representative of current

摘要

The device (1) has a closed magnetic circuit (2) that surrounds a surface (S) through which electric current passes. A winding (3) is wound around the magnetic circuit. A switching circuit (4) switches electric current (I) that is adapted to be supplied to the winding. The electric current is provided through a power supply that is controlled by a control signal (7). A sensor (5) measures a coil current. A control logic (6) provides the control signal, and a low pass filter (8) is utilized for extracting a coil current signal (9) that is representative of the current.