How to find the steady-state error for this response in Matlab?

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ASToonBlue

Joined Mar 19, 2016
8
I have calculated my transfer function and plot the following response using the command step in MATLAB
This is what I get in MATLAB
upload_2017-4-17_16-16-57.png

So from this diagram , it shows that the steady state value is 4.26 but how do I find the steady-state error ?
 

MrAl

Joined Jun 17, 2014
7,490
Hi,

In any language the steady state error will be the response at t=infinity minus the set point. So if your target set point is 2.000v and your response at t infinity is 1.999v, then your steady state error is -0.001 volt. You might also express this as a percentage of the output.
 
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