control system steady state error

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sumit naikwad

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why steady state errors are calculated for only unity feedback system:?lease reply me urgently.
 

Your question is very vague. Can you give some more detail of the 'steady state errors'?
 

we find steady state error ess in control system that is after reaching to steady state the difference between desired output and our actual output.but in book the whole analysis is given for unity feedback system.i dont understand that why analysis is not done for other system like non unity feedback system,it is given that steady state errors are found only for stable systems.
 

look here>
**broken link removed**.
 

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