Functional analysis of measurements

With the increasing demand for accurate measurements in all branches of the sciences, the many advantages provided by the use of electrical means in measurement have led to their general utilization in problems incorporating large numbers of physical quantities. Because the employment of electricity has complicated measuring equipment further, a practical system for analyzing measurement systems is needed. Through the use of functional analysis any measurement system can be considered as being composed of not more than three functional parts, thus reducing an almost unlimited variety of equipment to a relatively few fundamental types.