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Data acquisition is the various parameters of the object to be measured (the outside world, in situ) (which may be a physical quantity, it can be chemical, biomass, etc.) through a variety of sensing elements as appropriate conversion, and then through the signal conditioning, sampling, quantization, coding, transmission, and other steps, and finally sent to the controller of the process of data processing or storage record. It can be said that the data collection is to obtain a variety of information in one of the most important means in the analog world, is a communication bridge between the analog world and the digital world. With the rapid development and wide application of computer technology and digital signal processing technology, the data acquisition system more widely applied in more and more areas, such as radar signal processing, digital image processing, digital oscilloscope, ultrasonic testing, and virtual instrument and other fields. At the same time, with the emerging new technology, new achievements in the field of data acquisition applications, new devices such as high-performance, low-power the advanced ASIC integrated circuit technology, high-performance microprocessor technology, data the increasingly powerful acquisition system functionality, performance maturing. With the rapid development of computer technology, data acquisition system intelligence, miniaturization has laid a solid foundation. At the same time to be used more and more widely used in data acquisition systems, data acquisition system of indicators also put forward higher requirements. This paper discusses the data acquisition system, for example, the sampling resolution of 16-bit, sampling rate 45KSPS, the storage capacity of 20G ~ 40G requires powerful analysis software. Therefore, in the data acquisition system, a 16-bit analog-to-digital converter of the sampling rate 250KSPS AD7663 converts the analog signal into a digital signal; using the data after the conversion based on the embedded USB Host data storage solutions mobile hard disk storage; uses a high-performance ARM processor-S3C44BOX of as a system controller to achieve intelligent control of data acquisition and data storage; using LabVIEW to develop analytical processing software to achieve the data stored in the mobile hard disk analysis and processing. This article discusses the large-capacity data acquisition system based on USB Host and ARM technology has been completed and has been a practical application, praised by users. Actual use fully proved that the performance of the data acquisition system to achieve the expected goals, stable and reliable, easy to operate. The system has high performance and low cost, has some practical value, both as a general-purpose data acquisition system, virtual instrument can also be used as a digital oscilloscope, digital spectrum analyzer. If you optimize functionality realized and appropriately increase some of the features, such as USB OTG, man-machine interface, making the data acquisition system performance more perfect, more powerful, more concise to use data analysis and processing capacity is more perfect.
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