A data acquisition card is a device that converts analog signals into digital signals, and its core is an AD chip.

It is the bridge between the computer and the external physical world. The difficulty of various signal acquisition varies greatly. Noise may also cause some trouble in actual acquisition. Data acquisition is the automatic collection of non-electrical or electrical signals from the analog and digital units under test of a sensor waiting for a device to be measured, and sending them to a host computer for analysis and processing. In order to meet the needs of IBM-PC and its compatibles for data acquisition and control, many domestic and foreign manufacturers have produced various data acquisition boards or IO boards.

The data acquisition cards are designed and produced in accordance with the IBM-PC bus technology standard. As long as the user inserts such boards into the corresponding IO expansion slots on the IBM-PC motherboard, the data acquisition and processing system can be formed quickly and easily, which greatly saves hardware development time and investment, fully utilizes the IBM-PC hardware and software resources, and allows the user to concentrate on the study of the theory and methodology in the data acquisition and processing, and to carry out system design and programming.

When applying the data acquisition card, the data acquisition system is placed in the monitoring equipment, and samples and maintains the voltage or current signal of the equipment through the sensor, and sends it to the AD converter to enter the digital signal, and then sends it to the FIFO. when the data stored in the FIFO reaches a certain amount, ARM7 reads it from the FIFO, and then sends it to the upper computer through the Ethernet interface of ARM7 or RS232 sent to the host computer. Considering that there may be a lot of devices to monitor, they designed a multi-channel acquisition channel before going to the AD converter.

The CPLD is the control core of the whole system. It controls the switching of the acquisition channels, starting and stopping of the AD converter, the address generator for storing the converted data in the FIFO, and notifying the ARM7 to read the data stored in the FIFO. The running data and sent to the PC, through the specific software running on the PC to analyze the data, in order to determine the status of the current operating equipment, and then take appropriate measures. In its system software design, most of the data acquisition devices commonly used today use a single-task sequential mechanism. Therefore, there is the problem of poor system security. Data acquisition devices with high requirements for stability and real-time are not allowed, so it is necessary to introduce an embedded operating system.

There are usually two types of data acquisition, one is the process of collecting, identifying and selecting data from a data source.

The other is the process of digitizing, electronically scanning the system of records and encoding the content and attributes. Data collection includes visual report definition, audit relationship definition, report approval and release, data filling, data preprocessing, data review, comprehensive query statistics and other functional modules. Through the networked and digitized information collection, it expands the coverage of data collection and improves the comprehensiveness, timeliness and accuracy of auditing work; and ultimately realizes the modernization of related business work management, standardization of procedures, scientific decision-making and service network. Therefore, it is very convenient to work with data acquisition card, and with the progress of technology, the function of data acquisition card will be more and more powerful.

Furunda Relay

Ltd. is a NI alliance, agent, system integrator, mainly NIGPIB, NILABVIEW, NIDAQ, NI boards, NI data acquisition cards and other products. The company has a full set of hardware and software for product testing should be run solutions, the development scope includes ICT, Boundary Scan, functional testing, system testing. Business covers Shenzhen, Guangzhou, Zhuhai, Foshan, Nanjing, Hangzhou, Xiamen, Xi'an, Chengdu, Wuhan, Chongqing, Beijing and other places.

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