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Ribbon cable 120 ohm?

Discussion in 'Datasheets, Manuals and Component Identification' started by CommanderLake, May 11, 2013.

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  1. CommanderLake

    CommanderLake

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    Oct 2, 2012
    Look at THIS ribbon cable, it has an impedance of 120 ohm could somebody explain why a cable would have such an impedance?
     
  2. davenn

    davenn Moderator

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    Sep 5, 2009
    all cables have a characteristic impedance. Impedance is primarily a function of conductor diameter and spacing. Those 2 factors give a cable its inductive and capacitive reactances which when the combination of those is calculated gives it characteristic impedance


    Dave
     
  3. CommanderLake

    CommanderLake

    199
    6
    Oct 2, 2012
    If I measure it with a multimeter will I get 120 ohm or is it AC impedance at a high frequency?
     
  4. davenn

    davenn Moderator

    13,838
    1,952
    Sep 5, 2009
    no you cannot measure it with a multimeter
    Impedance is AC resistance

    Dave
     
  5. CommanderLake

    CommanderLake

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    Oct 2, 2012
    That makes sense.
     
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