How to find the DC gain in S domain?

[notyet]

Hi all.My question is realeted with the control design.I have a controler which is in the form of [k(1+10s)]/s.I want to find the dc gain of this controller and then discritize it.But in s domain to find dc gain we substitute s with 0 as it is known.However when we substitute s with zero we have infinity.How can i solve this problem.Thank you..

 

[greenforest]

Re: dc gain s domain

You should use MATLAB function dcgain to find dcgain of LTI model;

For example:
num - numerator of tranfer funtion
den - denominator of tranfer funtion

sys= tf(num,den);
K=dcgain(sys);