Bode plot

Homework Statement

How do you draw a bode plot?
I have a simple equation: H(S)=s+10 but no school book. Can you teach me?

Answers and Replies

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MATLABdude
Science Advisor
How about a tutorial?
http://www.facstaff.bucknell.edu/mastascu/elessonsHTML/Freq/Freq5.html

When you're drawing by hand, usually only the asymptotes are required; the effects of zeros, poles, higher ordered zeros and poles, and most of the simple cases are usually tabulated in the first chapter of any controls textbook.

EDIT: Summary for drawing asymptotic transfer functions (agrees with what I remember):
http://en.wikipedia.org/wiki/Bode_plot#Rules_for_hand-made_Bode_plot

EDIT: This post might've been better in the EE or Engineering homework subforum.

EDIT: Thought I recognized the username... Since you asked a MATLAB question, you may also want to look in this thread:
https://www.physicsforums.com/showthread.php?t=303967

Last edited:
I don´t have any poles and no zeros either.
So what do I do then? Or do I have one zero? = -10 ?

But I really don´t understand those webpages because they all have jw sth..

MATLABdude
Science Advisor
Yes, there's one zero. I'm not sure how far along you are in your complex math or controls course, but s is the 'generic' frequency $$s=\sigma+j\omega$$. If you're finding the frequency response (as you are in a Bode plot) you're only concerned with the situation where $$\sigma$$ is zero and frequency is imaginary (i.e. sinusoidal). That's why some of the previously-linked resources use $$j\omega$$ instead of s (even though the transfer function is given in terms of s)

Put another way, if your transfer function is called H(s), you're finding |H(jw)| (the magnitude of the frequency response) and the phase