Thank you for your reply.
I really worked like that and got the following equation:V(output) = Vdc (ref) *S + ( Vdc(ref) – Vdc(measu)(k1 + k2/S)
V(output) = Vdc(ref) *S + Vdc(ref) (k1 + k2/S) - Vdc(measu) *(k1 + k2/S) but I could not get the final equation between V(output) and Vdc(ref)...
I have a system with two inputs one is reference (constant and known) and another is measured its value and i need to know the transfer function for all the system.
Please anyone help me to find the transfer function because I needed it so necessary.
thanks a lot.