According to the demand of high magnetic field power supply, reference is increased with a set ramp rate and stops at a set stable value, so reference system is composed of digital setting and digit to analog converting circuit. But the stability of reference is mostly guaranteed by the performance of D/A circuit, so D/A circuit is particularly studied in reference system. The scheme of D/A circuit, the selection of DAC and its voltage reference, hardware anti-jamming design and PCB design are discussed in detail, and software of remote control and PLC are discussed in brief. Zero-flux DC current transformer well satisfies the demands of the high stability of Load current detection unit, so the principle of zero-flux DC current transformer is analyzed; in the mean time a project which detects the long term stability is designed. During 8 hours, analog signal which is detected with high precision digit multimeter is recorded in computer at 1HZ frequency by GPIB communication. The drift error source and related parameters are explained in the compare-amplify part. Detailed subtraction circuit is designed; also amplifier chip and periphery components are selected and verified according to the theory of error analysis.

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As a private mobile communication system, The digital trunkingmobile communication system was boomed in 1990's, and before this, the appliedprivate mobile communication systems in market are almost the analog systemwith analog voice and digital signalling. And there are no data referring to thesystem design and parameters chosen. It includes the wireless channel accessalgorithm of the mobile terminals, single base station capacity in large regional networks, link designing schemes between the switching control center and basestation as well as the study of the service quality for the multiple traffic. Theseindispensable parameters in design a digital trunking communication system arestudied in this dissertation and some instructive achievements can be got. To provethe correction of the theoretical study, the result was tested with the popularsystem of pan-European digital trunking communication system.

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This high voltage electrostatic precipitation controller has 7 channels of analog input,2 channels of analog output, 12 digital inputs and 16 digital outputs. The analog input includes primary current, secondary current, primary voltage, secondary voltage, etc. Controller uses MAX 187 as the A/D converter, which ensure the sampling speed and the conversion precision in the same time. The processor unit is RCM2250 module. Rabit 2000 processor, a 128K SRAM and a 256K Flash Rom are integrated in RCM2250, which improves the performance of pricipitation controller. MAX504 is used to produce the 4~20mA current output.

模擬量輸入采集的信號有升壓變壓器一次電流插操水视频、一次電壓狼友视频-首页、二次電流、二次電壓等www.xx日本黄色视频.com，采用12位逐次比較式A/D轉(zhuǎn)換器MAX187国产淑女色视频，兼顧采樣速率和轉(zhuǎn)換精度；中央處理單元采用以8位嵌入式處理器Rabbit2000為基礎(chǔ)的RCM2250模塊操逼视频大全网站，外擴(kuò)128KSRAM和256K Flash ROM能看av网站，內(nèi)部資源豐富，提高了控制器的整體性能力色阁国产；模擬量輸出采用內(nèi)帶基準(zhǔn)源的10位電壓輸出數(shù)模轉(zhuǎn)換器MAX504激情一级，實(shí)現(xiàn)了標(biāo)準(zhǔn)4～20mA電流信號輸出；控制器通過控制算法在相應(yīng)開關(guān)量點(diǎn)上輸出可控硅的觸發(fā)脈沖日本性爱不卡。

10 Multifunction Intelligent DAQ using LabVIEW FPGA, 8 analog inputs, independent sampling rates up to 200 kHz, 16-bit resolution,±10 V,8 analog outputs, independent update rates up to 1.0 MHz, 16-bit resolution,±10 V,96 digital lines configurable as inputs, outputs, counters, or custom logic atrates up to 40 MHz,User-defined triggering, timing, and onboard decision making with 25 ns resolution,1M gate reconfigurable I/O FPGA for parallel processing power

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This dissertation introduces the whole scheme、the hardware electro circuit design and software design, the result of experiment on salinometer is preferred at the end of the dissertation. Salinometer is base on SOPC technology, and use digital technology to design circuit: the excitation source for balance bridge is generated by digital method, its shape不卡欧美在线视频免费观看网站、amplitude and frequency can be control by digital signal, the standard branch of bridge is composed of three digital-analog-conversion, and uses the method of successive approximation to regulate the balance of bridge.

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It is a network terminal which is connected with digital television; it is used for transforming digital signals to analog signals. After decoding the digital constringent video and audio signals, it will engender analog video and audio signals. Consequently, it can provide high quality television program for audiences.

它是一種與電視機(jī)連接的網(wǎng)絡(luò)終端設(shè)備，用于將數(shù)字電視信號轉(zhuǎn)換成模擬信號又大又黄色视频日逼视频免费，它通過對數(shù)字化壓縮的圖像聲音信號進(jìn)行解碼還原，產(chǎn)生模擬視頻和聲音信號999精久久久人妻，以提供給觀眾高質(zhì)量的電視節(jié)目欧美特黄AAAAA片。

The working principle of a novel short st roke linear DC motor wit h permanent magnet s is presented. Mixed digital - analog cont rol approach based on DSP ( TMS320L F2407A) is proposed. Displacement detecting and cont rol technique are discussed. Displacement detecting circuit s , digital - to - analog converter (DAC7641) expanded circuit s and cont rol software are given.

闡述了一種新研制的短行程永磁直流直線電機(jī)的工作原理，提出了基于DSP ( TMS320L F2407A)的短行程直流直線電機(jī)數(shù)男生免费看黄色网站、娜蘸访酪豢ǘǎ混合伺服控制系統(tǒng)方案，重點(diǎn)對直線電機(jī)的位置檢測及控制技術(shù)進(jìn)行了研究日韩乱码无码中文视频，給出了DSP 控制器的位置檢測接口電路AV美女激情在线、16 位雙極性數(shù)模轉(zhuǎn)換器(DAC7641)的擴(kuò)展電路和控制軟件的實(shí)現(xiàn)方法。

We are applying to support high quality analog TV measurements and analog/digital TV transmitter and transposer.

為中國用戶提供高端的模擬電視測試設(shè)備以及模擬国内精品国产免费观看一级A片、數(shù)字電視發(fā)射及傳輸設(shè)備国产AV无码宅吉看久久久久久。

A high-speed digital-to-analog converter measurement method acquires and quantizes an analog ramp output by the DAC corresponding to a digital ramp input to produce a quantized ramp, determines a start and end of the quantized ramp, obtains a difference between the quantized ramp and an ideal ramp to produce a quantized periodic signal, determines a frequency for a qualified peak from an FFT of the quantized periodic signal, produces a mask filtered periodic signal from an iFFT around the qualified peak, and determines a sample window spanning a local maximum and minimum for each period of the quantized periodic signal.

一種高速模擬數(shù)字轉(zhuǎn)換器測量方法，采集和量化由DAC輸出的相應(yīng)于數(shù)字斜坡輸入的模擬斜坡以產(chǎn)生量化的斜坡漂亮人妻18P，確定量化的斜坡的開始和結(jié)束野狼社区精品，獲得量化的斜坡和理想的斜坡之間的差值以產(chǎn)生量化的周期信號，從量化的周期信號的FFT中確定合格峰值的頻率caopor超碰在线，從合格峰值周圍的iFFT中產(chǎn)生屏蔽過濾的周期信號国产在线不卡免费AV网站，并且在量化的周期信號的每一周期內(nèi)確定跨越局部最大值和最小值的采樣窗口欧美最近激情性高潮。

The digital users signals comprising in-phase component and quadrature component are converted to analog baseband signals by digital-to-analog converters 104 and 114, which are followed by lowpass filters 106 and 116 for removing harmonics at unwanted frequencies.

包括同相分量和正交分量的數(shù)字用戶信號通過數(shù)模轉(zhuǎn)換器104和114轉(zhuǎn)換成模擬基帶信號，在數(shù)模轉(zhuǎn)換器104和114的后面具有低通濾波器106和116激情偷乱人伦在线视频，低通濾波器106和116用于去除在不期望頻率處的諧波国产精品十八禁在线观看男男。