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Network time domain measurement system

  • US 3,903,477 A
  • Filed: 07/29/1974
  • Issued: 09/02/1975
  • Est. Priority Date: 07/29/1974
  • Status: Expired due to Term
First Claim
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1. Apparatus for measuring the high frequency electrical characteristics of a high frequency transmission line element under test by propagation of forward and backward scattered high frequency signals therethrough comprising:

  • step wave generator means, delay means responsive to said step wave generator means for producing a delayed step wave, first and second branching circuit means jointly responsive to said delay means, said first branching circuit means including harmonic wave generator means responsive to said delayed step wave, said second branching circuit means including differentiator circuit means responsive to said delayed step wave for producing a base band impulse signal, junction means coupling said first and second branching circuit means for forming a composite test signal, signal sampling means coupled between said junction means and said high frequency transmission line element when present for conducting said composite test signal through said high frequency transmission line element as a forward scattered high frequency signal, reflector means for reflecting said forward scattered high frequency signal through said transmission line element as a backward scattered high frequency signal, wave sample - and - hold means responsive to said signal sampling means for holding representations of said composite test signal, said forward scattered signal, and said backward scattered signal, general purpose computing means responsive to said wave sample and - hold means adapted to be programmed to compute said high frequency electrical characteristics in response to said held wave representations, and display means responsive to said computing means for displaying said high frequency characteristics when computed.

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