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Why does longer probe cable reduces bandwidth

Discussion in 'General Electronics Discussion' started by 00135599, Aug 23, 2014.

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  1. 00135599

    00135599

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    Aug 23, 2014
    Why does longer probe cable reduces bandwidth of the probe? Does it mean the higher frequencies won't be transmitted? Is the reduction applied always only on higher frequencies? Why? What's the physic of this?
     
    Last edited by a moderator: Aug 24, 2014
  2. OLIVE2222

    OLIVE2222

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    Oct 2, 2011
    Supercap2F likes this.
  3. 00135599

    00135599

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    Aug 23, 2014
    I was reading this document, when found the note about reducing bandwidth of the probe with longer cable. I will continue reading, then, and try to find explanation later in the text. Thanks.
     
  4. Arouse1973

    Arouse1973 Adam

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    Dec 18, 2013
    00135599 likes this.
  5. Merlin3189

    Merlin3189

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    Aug 4, 2011
    I think this is why you use a x10 probe on the end of the cable. Then you can adjust the serial capacitor to match the cable (& input) parallel capacitance.
    Without a probe with serial capacitor, there is only parallel capacitance, which attenuates signals proportional to frequency and this effect is worse the longer the cable.
     
  6. Arouse1973

    Arouse1973 Adam

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    Dec 18, 2013
    Yes and its series capacitor. And this is the reason x1 probe has lower bandwidth because you have shorted out the capacitor at the tip.
    Adam
     
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