tailieunhanh - Blueprint Reading - Part 2 (end)

Schematic là một bản vẽ bằng cách sử dụng các biểu tượng và đường dây. Symbol là một dấu hiệu đơn giản cho một thiết bị hoặc một thành phần. Chất lỏng là một chất lỏng hoặc khí. Truyền thuyết là một lời giải thích trên một số sơ đồ cung cấp cho thông tin đặc biệt về đường nét, biểu tượng, và đặc điểm hoạt động. Thành phần là một đơn vị duy nhất hoặc một phần. Potentiometer là một điện trở ba thiết bị đầu cuối với một kết nối trung tâm điều chỉnh, sử dụng rộng rãi. | Part II Schematics 2002 by CRC Press LLC 12 Schematics and Symbols INTRODUCTION Because of the complexity of many electrical and mechanical systems it would be almost impossible to show them in full-scale detailed drawing. Instead symbols and connecting lines are used to represent the parts of a system. Key Terms Used in this Chapter Schematic is a drawing using symbols and lines. Symbol is a simple sign for a device or component. Fluid is a liquid or gas. Legend is an explanation on some schematics that gives special information about lines symbols and operating characteristics. Component is a single unit or part. Potentiometer is a three-terminal resistor with an adjustable center connection widely used for volume control in radio and television receivers. SCHEMATICS Figure shows a voltage divider containing resistance and capacitance connected in a circuit by means of a switch. Such a series arrangement is called an RC series circuit. Note that unless the reader is an electrician or electronics technician it is not important to understand this circuit. However it is important to understand that Figure depicts a schematic representation formed by the use of symbols and connecting lines for a technical purpose. A schematic is a line drawing made for a technical purpose that uses symbols and connecting lines to show how a system operates. HOW TO USE SCHEMATIC DIAGRAMS Learning to read and use any schematic diagram is a little bit like map reading. In a schematic for an electrical circuit for example it is necessary to know which wires connect to which component and where each wire starts and finishes. With a map this would be equivalent to knowing origin and destination points and which 2002 by CRC Press LLC FIGURE Schematic of an RC series circuit. roads connect to the highway network etc. However schematics are a little more complicated as components need to be identified and some are polarity conscious must be wired up in the circuit the