Understanding the Bode Plot: Frequency vs. dB

AI Thread Summary
The discussion focuses on the axes of a Bode plot, clarifying that the x-axis can represent either angular frequency (omega) or frequency (f), while the y-axis is expressed in decibels (dB) using the formula 20 log(|H(jw)|). A user seeks guidance on setting specific ranges for the axes in a Nyquist plot, detailing a transfer function for context. Another participant advises starting a new thread for unrelated questions to maintain clarity. The conversation highlights the importance of proper axis representation in frequency response plots and the need for organized forum discussions.
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Is the x-axis of a Bode plot supposed to be angular frequency omega or just the frequency f? The y-axis is in dB. Thanks!
 
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Usually when I draw it on paper, I have it in angular frequency [rads/sec] (log scaled). The y-axis is 20 log (|H(jw)|) [dB].
 
hi, i would like know how to set the range on the axis? for an example i want to plot a nyquist plot with the range of x-axis is from -0.08 to 0.02 and the range of y-axis is from -0.2 to 0.2. (with the system G =(5s + 200)/((s)*(s^2 +4s + 10)*(s^2 + 10s + 150))...

please help me out here if anyone knows how to write in the m.file(MATLAB)...thanks
 
Welcome to PhysicsForums! For future reference, whenever you have something like this (a somewhat related question that nevertheless does not directly follow from the previous items) you really ought to start a new thread, not resurrect one that's 4 years old!

In any case, take a look in this thread:
https://www.physicsforums.com/showthread.php?t=303967

(Second mention in less than 3 hours!)
 
sorry about that :)
 

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