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虛擬數(shù)字存儲(chǔ)示波器畢業(yè)論文中英文資料外文翻譯文獻(xiàn)-全文預(yù)覽

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【正文】 support numerical type, Boolean, and the string of text, and other data types, but the biggest advantage is through dialog forms of interactive operations generate standard C code. In addition LabWindows / CVI provides a very rich debug tools, including singlestep, breakpoints, variable view, monitor window, and so on, these features make the adjustment process has bee more vulnerable. Have the function ★ function with realtime display: Acquisition Acquisition signal to the input signal and realtime display in a PC terminal. ★ digital filtering: IIR filter on the use of digital signal processing and realtime filtering, at the same time filter can be set up in the best approximation function type, filter type, order, from top to bottom cutoff frequency, and other parameters. ★ latest wave show: to meet the transient waveform display, but can also be transient waveform to be saved. ★ waveform storage: at any time after the original signal or signals to the LVM LabVIEW unique file format stored on the local hard drive, for future analysis or processing. One transient signal to the cutoff wave after BMP format images stored in local hard 上供 view and analysis of the future. ★ significant wave back: to keep the memory of the LVM format waveform reread the document and then displayed on a PC client. ★ spectrum analysis: After the filter frequency signal respectively corresponding analysis and response analysis of the frequency and wave at the same time to show realtime manner and form. Basic principles the use of hardware acquisition card acquisition signals, using software provided by NI DAQmx READ acquisition signals, and then through Waveform Graphs to conduct realtime display. This has a basic oscilloscope, signal showed that after using Write To Measurement File waveform will be saved as LVM documents. This realization of the basic store function, but through Read To Measurement File can be read LVM, thus pleting the echo feature. As the hardware and the acquisition of PCcardbased, so the limit of sampling oscilloscopes in the rate, bandwidth, resolution, and other parameters is limited. And procedures on the response time is dependent on the PC39。s biggest advantage is fast, simple control, programmable device to control. A / D circuit as follows: The A / D circuit of the dynamic range of input signal for a small V ~ . In order to be extended to the dynamic range of 0 ~ 10 V, to be in its previous level by adding the following adjustment circuit. In addition to the circuit five times the input signal attenuation, the input signal is still on the superposition of the V DC. Control circuitry to do the programmable device, the main address cumulative unit, sampling speed option modules and programmable device and MCU interface unit. The address cumulative unit circuit as follows: CLK for the system clock, counting from the former firstchfa enter a negative pulse, D flipflop on the counter and reset, then the clock counting. When the full terms, the circuit automatically cease to work and produce a lowINT signal to mark the end of counting. Onf signal to latch signal, when it was low, latch the current sampling. The choice of memory chips and realtime considerations: Option 1: a sampling data storage RAM, to put the first postharvest methods of work. Circuit advantages of this method is simple, control simple, easy to implement. But only in the higher frequency when the input signal to a more stable output waveform, when the signal is very low, the output waveform update cycle is too long, the lack of realtime, and the output waveform data acquisition can not be carried out at the same time, some signal will be lost Information. Option 2: The two RAM, using a RAM storage of data collection, another film RAM output data, that is, two alternate RAM storage and output. The way to resolve some of the lost information signal, but the rate of mining must be consistent, otherwise the data will inevitably cause conflict. The method for lowfrequency signals no meaning, no good solution to the problem of realtime and more plex circuits, the occupation of mouth line resources, wastage. Programme 3: I use one pair of RAM, while mining release. The method simple circuit, the better solution of the problem so the realtime use of the programme. As the highest sampling rate is 1 MPS, it demands the greatest memory access time should be less than 1 us. As the level of demand for the resolution of 20:00 / div, and a total of 10 analog oscilloscope grid, that is, every time scanning should have 200 points, Therefore, storage of only 200 units. When the input signal an acquisition, the assumption that the largest full screen display a cycle of the signal, the storage period of 10 signals on the topic has been overmeet the requirements, the storage capacity as 2 K we choose the dualport RAM is IDT7132, the chip There are two symmetrical signal that each port has its own address lines, data lines and the Line of Control. The access time for the 25 ns ~ 35ns, storage capacity of 2 K, in the nonelected automatically in lowstatus, asynchronous operation, threestate input and output, and TTLlevel patible. Waveform display circuit: a waveform display XY manner and external trigger mode. However, in order to show the oscilloscope characters must choose XY approach. 1) Analysis of the data output rate: As the maximum speed of data acquisition for 1 MHZ, so data playback system scan rate should be more than 1 MHZ, can display realtime data update process. According to the experiment, we selected output frequency to 2 MHZ. In the output frequency, the realtime system better, and waveform stability, not distortion. We choose the DA is DAC0800, its output current setup time fo
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