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First order systems bode plot

  1. Jun 2, 2014 #1
    untitledcx.png

    How did they get the blue box? I know where they got the 0.5 inside the brackets from but not sure about the rest.

    The bode plot in my data book has log10(wt) as the x-axis..
     
  2. jcsd
  3. Jun 3, 2014 #2

    NascentOxygen

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    Staff: Mentor

    The formula in the blue box: that's how you convert from a voltage ratio into decibels, 20.log10(...)
     
    Last edited: Jun 3, 2014
  4. Jun 3, 2014 #3

    NascentOxygen

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    Staff: Mentor

    That's the frequency axis, they have normalized it and used a log scale so the graph can cover a wide frequency range without needing a 2 metre-wide sheet of graph paper. They could have used log-log graph paper instead of taking logs of the data values.
     
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