數(shù)據(jù)采集外文翻譯(文件)
【正文】 he measured signal, the sampling interval period T Δ T = T/N (N for week of sampling points), Thus the count value determined timer,Use timing interrupt way realization synchronous sampling. The advantage of this method is no hardware synchronous circuit, simple structure .This topic will be the eventual realization of access to embedded systems， the realization of the power measurement and monitoring,monitoring system to meet the electricity work,intelligence requirement,it promote the development of remote monitoring services,bringing a certain degree of effectiveness. On the fundamental reactive current and harmonic current detection, there are mainly 2 ways: First, the instantaneous reactive power theory based method, the second is based on adaptive cancellation addition, there are other nonmainstream approach, such as fast Fourier transform method, wavelet transform. Instantaneous power theory based on the method of offensive principles are: a threephase current detection and load phase voltage A, the coordinate transformation, twophase stationary coordinate system the current value, calculate the instantaneous active and instantaneous reactive power ip iq,then after coordinate transformation, threephase fundamental active current, with the final load current minus the fundamental current, active power and harmonic currents are fundamental iah, ibhi, ich. From:Principles of Data Acquisitio 數(shù)據(jù)采集 目前，我國(guó)高校公寓管理正在向著正規(guī)化、市場(chǎng)化發(fā)展，在不斷提高學(xué)生方便用電的同時(shí)，用電事故頻有發(fā)生，雖然部分高校公寓已經(jīng)安裝了 電能計(jì)量監(jiān)控系統(tǒng)，但這些系統(tǒng)普遍存在著監(jiān)控程度低、計(jì)費(fèi)精度不高、電費(fèi)均分、網(wǎng)絡(luò)程度低等諸多端。數(shù)據(jù)采 集技術(shù)廣泛引用在各個(gè)領(lǐng)域。采集的數(shù)據(jù)大多是瞬時(shí)值，也可是某段時(shí)間內(nèi)的一個(gè)特征值。數(shù)據(jù)采集含義很廣，包抱對(duì)面狀連續(xù)物理量的采集。其次 ,總線兼容型數(shù)據(jù)采集插件的數(shù)量不斷增大 ,與個(gè)人計(jì)算機(jī)兼容的數(shù)據(jù)采集系統(tǒng)的數(shù)量也在增加。本文采用基于加窗插值的 FFT 算法分析系統(tǒng)諧波，提高了各項(xiàng)電能質(zhì)量參數(shù) 的準(zhǔn)確性。信號(hào)經(jīng)過(guò)互感器、運(yùn)放送入 A/D轉(zhuǎn)換器，利用 DSP的多通道緩沖串口（ McBSP）與A/D相連，進(jìn)行數(shù)據(jù)的采集和運(yùn)算。六通道同時(shí)采樣，同時(shí)轉(zhuǎn)換，分時(shí)傳輸，有效地減少了由于采樣時(shí)間不同而產(chǎn)生的相位誤差。非同步采樣的影 響：在實(shí)際測(cè)量時(shí)很難做到同步采樣和整數(shù)個(gè)周期截?cái)?，因此出現(xiàn)了影響測(cè)量準(zhǔn)確性的頻譜泄漏問(wèn)題。但是 FFT 的頻譜是離散的，只在各采樣點(diǎn)有頻譜，而在其它
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