正确选择数据采集系统解读.doc

Selecting the Right Data Acquisition System Engineers often must monitor a handful of signals over extended periods of time, and then graph and analyze the resulting data. The need to monitor, record and analyze data arises in a wide range of applications, including the design-verification stage of product development, environmental chamber monitoring, component inspection, benchtop testing and process trouble-shooting. This application note describes the various methods and devices you can use to acquire, record and analyze data, from the simple pen-and-paper method to using todays sophisticated data acquisition systems. It discusses the advantages and disadvantages of each method and provides a list of questions that will guide you in selecting the approach that best suits your needs.Introduction In geotechnical engineering, we sometime encounter some difficulties such as monitoring instruments distributed in a large area, dangerous environment of working site that cause some difficulty for easy access. In this case, operators may adopt remote control, by which a large amount of measured data will be transmitted to a observation room where the data are to be collected, stored and processed. The automatic data acquisition control system is able to complete the tasks as regular automatic data monitoring, acquisition and store, featuring high automation, large data store capacity and reliable performance.  The system is composed of acquisition control system and display system, with the following features:  1. No. of Channels: 32 ( can be increased or decreased according to users real needs.) 2. Scanning duration: decided by user, fastest 32 points/second 3. Store capacity: 20G( may be increased or decreased) 4. Display: (a) Table of parameter (b) History tendency (c) Column graphics. 5. Function: real time monitoring control, warning  6. Overall dimension: 50cm×50cm×72cm Data acquisition systems, as the name implies, are pro