Apparatus for determining disturbances along electrical lines utilizing the impulse reflection method including adjustable equalizing means and stroboscopic sampling

Claim 1

APPARATUS FOR USE WITH AN ELECTRICAL TRANSMISSION LINE UNDER TEST, FOR TESTING IMPEDANCE IRREGULARITIES THEREIN, COMPRISING A SOURCE OF CONTROLLING IMPULSES, MEANS FOR GENERATING TEST IMPULSES AT A GIVEN RATE FOR APPLICATION TO SAID TRANSMISSION LINE, SAID CONTROLLING IMPULSES BEING SYNCHRONIZED WITH SAID TEST IMPULSES, A CATHODE RAY OSCILLOSCOPE HAVING A CONTROL GRID, HORIZONTAL AND VERTICAL DEFLECTION MEANS FOR VISUALLY INDICATING THE RESULTS OF THE TEST, MEANS FOR GENERATING A STROBOSCOPIC TIME DEFLECTION VOLTAGE FOR SAID HORIZONTAL DEFLECTION MEANS, CIRCUIT MEANS CONNECTED TO SAID TRANSMISSION LINE BETWEEN SAID TEST IMPULSE GENERATOR AND SAID OSCILLOSCOPE CONNECTING THE LINE AND THE VERTICAL DEFLECTION MEANS OF SAID OSCILLOSCOPE INCLUDING TIME-CONTROLLABLE EQUALIZING MEANS FOR EQUALIZING THE DISTORTION OF SAID TEST IMPULSES, FURTHER INCLUDING A SAMPLING GATE, AND STILL FURTHER INCLUDING A BAND PASS FILTER, THE INPUT OF SAID BAND PASS FILTER BEING CONNECTED TO THE OUTPUT OF SAID SAMPLING GATE, A SAWTOOTH GENERATOR FOR PRODUCING A SAWTOOTH VOLTAGE, SAID SAWTOOTH VOLTAGE BEING SYNCHRONIZED WITH SAID CONTROLLING IMPULSES, A COMPARATOR CONNECTED WITH SAID MEANS FOR GENERATING SAID STROBOSCOPIC VOLTAGE AND WITH SAID SAWTOOTH GENERATOR, CIRCUIT MEANS CONNECTING THE OUTPUT OF SAID COMPARATOR WITH SAID SAMPLING GATE, AND CIRCUIT MEANS CONNECTING SAID MEANS FOR GENERATING SAID STROBOSCOPIC VOLTAGE WITH SAID TIME-CONTROLLABLE EQUALIZING MEANS, SAID STROBOSCOPIC VOLTAGE SERVING AS A TIMECONTROL VOLTAGE FOR SAID EQUALIZING MEANS.