【正文】 puter technology, puter digitized using static and dynamic analysis of the ideal test has finally bee a of several key technologies, including puter precision, speed。analog to digital conversion accuracy, speed。memory, hard disk storage capacity and speed。puter and A / D price issues have been with a variety of functions dedicated software the rapid development of a new technology emergesvirtual instrument(VirtualIstrument, referred to VI).VI technology development and application of the United States from 1986 designed by NI LabVIEW, it is a graphicsbased development, debugging and running programs integrated environment to realize the concept of a 39。s “Software Instrument”(Softwareisinstrument)pletely broke the traditional instruments can only be given by the manufacturer the user can not change the intelligentWith cuttingedge technology(such as aerospace, weapons engineering)and highrisk project development needs of electronic measurement technology increasing degree of in recent years the field of embedded puter technology development to enhance the intelligence of electronic measuring instruments provide good in recent years, such as embedded chip FPGA, ARM, CPLD, etc., they are a highreliability, high stability, fast immediately applied to electronic measuring microputerbased processing technology microprocessor allows the measurement methods of measuring instruments diversification measure realtime and highly intelligent.Ⅳ.DDS technology development historyIn the traditional field of electronic measurement and instrumentation, PLL Frequency Synthesizer(PLL)is the most monly used frequency co into electronic measurement and instrumentation industry continues to develop, for frequency synthesis techniques are increasingly high emerged in the midcentury direct digital frequency synthesis(DDS)is an alldigital frequency synthesis technology, due to its special principle and structure, so that in electronics, munications, access to a growing range of the field of electronic measurement and instrumentation, DDS The main applications include: audio testing, product testing, the instantaneous power signal reproduction, shock and vibration test, medical test equipment, conventional waveforms and arbitrary waveform generator, high precision, multifunction modulation etc.Ⅴ.ConclusionIn summary, in the 21st century electronic measuring instruments with chip technology and DSP technology will reach an unprecedented high performance, with puter technology and the further integration of the instrument, the instrument39。s ease of operation, easy scalability, measurement capability, the number of data processing and analysis capabilities have been greatly the same time, software engineering and network technologies are increasingly being applied to various fields, development of simulation technology as well as electronic measurement provides a more powerful and convenient short, the electronic measurement technology development is a multidisciplinary, multifield development cocrystallization, while between them for each other and mutual service of with the development.第五篇：應(yīng)變測量實驗報告一、實驗?zāi)康膶W(xué)習(xí)應(yīng)變片粘貼、使用的基本方法學(xué)習(xí)電橋的聯(lián)線方法及電橋的測量原理和特點學(xué)習(xí)使用WS3811應(yīng)變儀測量應(yīng)變的基本方法二、實驗原理利用惠斯登電橋原理進行測量三、實驗儀器微型計算機、WS3811數(shù)字式應(yīng)變儀、橋盒、應(yīng)變片及其附件四、實驗內(nèi)容；，使測點表面平整、光潔，并做清潔處理；，盡量使應(yīng)變片與被測物緊密貼合，如圖1所示： ，使它自然干燥； ；，進行測試和設(shè)置：應(yīng)變量程設(shè)置為177。40000με，濾波頻率 設(shè)置為20Hz，界面如圖3；，選擇“自動校準”，設(shè)置界面如圖4所示；。把橋盒連接到試驗儀上，試驗儀已與電腦連接。把被測金屬長 片的一端用手按在桌沿，使它伸出桌面。設(shè)置好參數(shù)，點擊“開始示波”，此時波形為一條直線，說明連接正常，再用手撥動金屬長片伸出桌面的那一端使它振動，這時波形如圖5，操作界面如圖5所示；，保存數(shù)據(jù)。實驗完成。五、實驗結(jié)果實驗結(jié)果如圖5所示：六、思考題，1/4橋接法應(yīng)用于一個應(yīng)變片，前者的橋盒上多接了一根兩個應(yīng)變片的共用線，少了一個短接插片。，而校準的目的是使測試值更加精確，減少儀器的誤差。