FAQ: Isn't the sensitivity function the same as the function used for steady state error? How are they related?

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Posted by Asa Hopkins, 22 November 2002
Yes, the sensitivity function is the transfer function from the reference to the error, which we evaluate at s=0 to determine the steady-state error. More generally, this function tells us about tracking error at whatever frequency -- the steady state error is just the tracking error at zero frequency.