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This text is intended to be used in a classroom course for engineers that covers the theory and art of modern instrumentation and measurements (I&M). There is more than enough material to support two semesters work. Thus the instructor has the option of choosing those topics and the depth of coverage that suit his or her interests and curriculum. Because of its breadth, Introduction to Instrumentation and Measurements will also be useful as a reference for the practicing engineer and scientist interested in I&M. Why have a classroom course in I&M? Over the past decade or so, in the US, many electrical engineering (EE) departrnents have discontinued classroom courses on the theory and practice of instrumentation and measurements. In the past decade we have also seen the swift development of new and exciting means of measurement using new technologies, the adoption of new standards, and concurrently, the lack of development of a coherent educational base to support their understanding and use. Using an instrument in the laboratory is not the same as understanding the physical and electronic principles underlying its design and its functional limitations. Clearly, there is now more than ever a need for classroom experience in the new I&M that will give students the necessary technical background to use and design sensors, signal conditioning systems, and I&M systems. We feel that this text suppports that need. This text was written based on the author's 33 years of experience in teaching a classroom COurse (EE 230), Electrical Instrumentation, to juniors and seniors in the Electrical and Systems Engineering Departrnent at the University of Connecticut, Storrs. Oour EE 230 is a required course for our seniors; it supports their capstone senior design laboratory experience. Obviously, in 33 years, we have seen the field of instrumentation and measurements evolve with the test of electrical engineering technology. Because of the rapid pace of technical development, it generally. has been difficult to find an up-to-date text for our Electrical Instrumentation course. After years of frustration in trying to match a text to course content, I decided to write one that would not only encompass the "traditional" aspects of I&M, but algo include material on modern integrated circuits (IC) and photonic sensors, microsensors, signal conditioning, noise, data interfaces, digital signal processing (DSP), etc.