专利名称：METHOD AND APPARATUS FOR
EVALUATING THE INTEGRITY OF THESHIELD CONNECTION IN A SPLICINGSECTION JOINING THE ENDS OF ADJACENTINSULATED AND SHIELDEDCOMMUNICATION CABLES
发明人：CAMPBELL R,US,WILKENS W,US申请号：US3711767D申请日：19701030公开号：US3711767A公开日：19730116
摘要：This invention provides an effective method and apparatus for testing thecontinuity of the shielding in communication cables, such as telephone cables, and forlocating sections thereof which are defective and require repairs; without puncturing ordamaging the cable insulation. The apparatus system embraces two identical probesdesigned for convenient application to the opposite ends of the splicing section to betested. Each probe embraces a pickup electrode and an electronic impedance convertingcircuit. Noise signals induced on the cable shield from an exterior source, are capacitivelycoupled, through the cable insulation, to the pickup electrode on each probe, and thenprocessed through an ultra high unity gain impedance converting circuit in the probehead and into a low impedance signal. The output from the two probes are connectedthrough a switch to the input transformer of a measuring set which also includes anattenuator and appropriate operational amplifiers. A bridge rectifier meter circuit with an
appropriate damping capacitor provides the means for measuring the signal level.
申请人：WILCOM PROD INC,US
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