Length measuring device for electrical line using pulse echo method, such as for energy or communications line network, has complex 2-pole network matched to supplied pulse duration used as end termination

摘要

The device uses a pulse source supplying pulses to the measured electrical line (1), with detection and evaluation of the corresponding echo signals. A complex 2-pole network, provided by a band pass, is connected to the end (14) of the measured electrical line, having a complex electrical resistance matched to the period duration of the pulses, allowing the reflected echo signal to be differentiated from the echo signals from other network elements by the evaluation device.