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metanordning for examination of the characteristics of a pammultipelfelt approaches elements in an electronic teleforbindelsevexel
metanordning for examination of the characteristics of a pammultipelfelt approaches elements in an electronic teleforbindelsevexel
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机译:用于检查pammultipelfelt特性的metanordning接近电子远射电子
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摘要
To measure electrical characteristics of a line segment, a switch or some other circuit element of a time-sharing telecommunication network using pulse-amplitude modulation, a transmission path is established between two subscriber lines through the circuit element to be tested, these subscriber lines being respectively connected to a generator of a sinusoidal test signal and to a highly sensitive signal detector. The two subscriber lines are briefly closed during a single sampling interval, or during two consecutive sampling intervals separated by an intervening guard interval during which capacitively stored residual energy is dissipated, depending on the nature of the test.
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