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Problem about characteristic impedance

Discussion in 'Electronic Basics' started by Archer, Sep 26, 2004.

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  1. Archer

    Archer Guest

    how to measure the characteristic impedance of a coax?
    I'm starting to study the rf circuit design.
     
  2. Rich Grise

    Rich Grise Guest

    I've always found a time domain reflectometer gets me close enough.

    Good Luck!
    Rich
     
  3. Roy McCammon

    Roy McCammon Guest

    you the impedence (complex) with the far end
    shorted and with it open and the characteristic
    impedence is the (complex) geometric mean of those
    two measurements.
     
  4. Archer

    Archer Guest

    may i measure the impedence using meter?
    and how would it be done that measure the open far end coax?
     
  5. Roy McCammon

    Roy McCammon Guest

    I suppose you might do with a vector volt meter. Not sure.
    Been too long since I used one. I'd use a scope.
    you don't measure at the far end. you just short the far end
    or open the far end.
     
  6. Or you also could measure the inductance of the inner conductor and
    capacitance between the inner conductor and the shield. Z0=sqrt(L/C)

    Regards
     
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