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System detects the multi-channel data acquisition

Set scan channel number sequence is 0h14, scanning frequency of 5O00Hz (1 per 200.us channels on a scan) In addition, through the procedures defined in the sampling process, each A / D conversion of the data stored in the data before buffer (FIFO), when the data in the buffer reaches a certain number, by the cache logic via an interrupt to the CPU interrupt request. Response to an interrupt, the interrupt program reads data from the data buffer will be one microcomputer memory. The sampling procedures defined in the buffer threshold is 900 (A / D conversion result is 16 bits,air jordans, each two bytes of data, 900 bytes of sampled data can be stored 450.), 30 per scan cycle is complete After issuing an interrupt request data buffer, the interrupt frequency is 5000/30 = 166.7Hz. Experiments show that the sampling program is reliable. Figure 3 Schematic diagram of multi-channel analog signal acquisition 30 - 3 Shandong Institute of Technology fast sampled data stored in the l5 channel analog signal acquisition process. Continuous acquisition time of 20 seconds, the data capacity of 3MB. In the collection process, all data must be saved. The data is obviously not so much with the conventional memory storage. So. The author uses the conventional memory and expanded memory and storage method used. Successfully solved the storage problem of the fast sampling process. Samples from the above principle that the buffer interval for each interrupt to ask twice for the 200 �� 30-6000 ~ s. During this time. CPU interrupt program is executed first, from the capture card will be 900-byte buffer removed and stored in an array of conventional memory, then, would array the data files transferred to the expanded memory of them, but also do some The practical test ancillary work, such work in the 3000> s to be completed within. Until the end of the sampling process, to expand the memory of all the data were then transferred to the electronic disk,stivali ugg, and then enter the data processing shown in Figure 4 Figure 4 Schematic diagram of the data stored in the data storage of the experiment, the authors expanded memory, hard drives, electronic disk and floppy disk storage to expand the memory by comparing the speed is faster than e-disk,ugg milano, electronic trading is faster than hard drives, floppy disks the slowest in the sampling process,ugg italia, if the data is written directly to the array of electronic trading, the time required will be more than 6000 # s, can not meet the requirements of the sampling rate. This data collection method described has been used in the actual test, several practice shows that the sampling process is stable and reliable. References: [1] DIAMOND-MM for a 32-a ATUserManualV2.3 �� Copyright2000 [2] sysCentreModu] eTM / SuperDX technical manuals SBSscience & TechnologyCo-Lid [3] MichaelCDalonta �� c a + Po [nrersandDynamicMemoryManagementt1996DataAcquisitionofAWeaponSystemDiagnosisZhaoLeiR \) YangShuxing (BeijingInstituteofTechnology, Beijing100081, China) AbstractThispaperintroducessomedataacquisitiontechniquesinweapondiagnosis.Itmainlyde-scribesthetechnicalspecificationsandtheschemesinprecisefrequencymeasurement, high-speedmulti-channelanalogsignalsamplingandquickdatasaving.Also, itpresentssomeskillsofprogrammingandinter-ruptsarrangement �� Keywordsdataacquisition, frequencymeasurement, datasaving

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