This document discusses data acquisition systems (DAS). It begins with an introduction that defines DAS as the process of sampling real-world physical conditions with sensors and converting the analog signals into digital values. The document then outlines the topics to be discussed, which include the objectives, block diagram, methodology, hardware/software, merits and demerits of DAS. It provides details on each of these sections, describing the components and functions of DAS. The document aims to explain what DAS is and how it works to convert physical measurements into digital values that can be analyzed by computers.