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Speed of propagation

Discussion in 'General Electronics' started by Bob, Jul 23, 2004.

  1. Bob

    Bob Guest

    Is there a procedure for calculating the propagation speed of an electrical
    signal over wire given the type of wire and its dimensions? If not is there
    some rule of thumb for the speed?

    Bob
     
  2. GPG

    GPG Guest

    Google "velocity factor"
     
  3. Adam

    Adam Guest

    About two-thirds the speed of light.
     
  4. SolarWind

    SolarWind Guest

    Hi, a simple way to calculate the speed by comparison.
    Suppose the wire is from "A" to "B", connecting the "A" to a pulse
    generator, and connect the "B" to a pico second oscillator that has
    dual traces, another trace input connected to "A" point (Note: the "A"
    to "B" long enough to compare to the length of "A" to oscilloscope
    input), now you can compare both traces response, the different
    between front edge of pulse is the time delay in wire, from that you
    can calculate the propagation delay in wire very precisely.

    Good lucky!
     
  5. SolarWind

    SolarWind Guest


    Correction:

    Original: "and connect the "B" to a pico second oscillator that has
    dual traces,"

    Modified: "and connect the "B" to a pico second sampling oscilloscope
    that has dual traces,"
    Note: Pico second sampling oscilloscope is used for measuring
    the pico second(1/1000,000,000,000 second) time delay,
    such as the time delay within a semiconductor etc.
     
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