The invention of interest is a system comprised of methods and a collection of tangible measurement device & electronic data collection systems. I was advised to avoid mixing: the structure specification of the invention and a step in a process in the same claim.
Is there a specific guidance from the USPTO or in 35 USC? or is the guidance that one learns through experience/best practice? I pose this question because if it is the former, then I would like to read the guidance so that my claims will conform to USPTO or other authoritative expectations.