The Maxim Integrated 71M6541-DB REV 3.0 Demo Board is a demonstration board for evaluating the 71M6541 device for single-phase electronic energy metering applications in conjunction with the Remote Sensor Inter-face. It incorporates a 71M6541 integrated circuit, a 71M6601 Remote Interface IC, peripheral circuitry such as a serial EEPROM, emulator port, and on-board power supply. A serial to USB converter allows communication to a PC through a USB port. The Demo Board allows the evaluation of the 71M6541 energy meter chip for measurement accuracy and overall system use.
標(biāo)簽： 71M6541 演示板 用戶手冊(cè)
上傳時(shí)間： 2013-11-06
上傳用戶：雨出驚人love
NewStar210A中頻信號(hào)采樣器是東方聯(lián)星針對(duì)GPS/GNSS接收機(jī)前端工作過程設(shè)計(jì)研發(fā)的產(chǎn)品，具有體積小，功耗低，易于使用等優(yōu)點(diǎn)。特有的GPS中頻數(shù)據(jù)回放功能，為GPS接收機(jī)開發(fā)、調(diào)試提供穩(wěn)定、可靠、可重復(fù)使用的信號(hào)源，起到了GPS信號(hào)發(fā)生器的部分作用。
標(biāo)簽： NewStar 210A 210 GPS
上傳時(shí)間： 2013-10-30
上傳用戶：superman111
介紹全球?qū)Ш叫l(wèi)星系統(tǒng)軟件接收機(jī)的基本結(jié)構(gòu)和優(yōu)點(diǎn)，系統(tǒng)地實(shí)現(xiàn)了GPS軟件接收機(jī)。該結(jié)構(gòu)的硬件部分實(shí)現(xiàn)中頻信號(hào)采樣模塊，軟件部分實(shí)現(xiàn)可設(shè)置12通道的中頻信號(hào)處理模塊、信號(hào)捕獲和跟蹤、導(dǎo)航電文存儲(chǔ)及轉(zhuǎn)換，并針對(duì)偽距定位算法部分實(shí)現(xiàn)了單點(diǎn)靜態(tài)定位，考慮的誤差源主要包括衛(wèi)星鐘誤差、對(duì)流層誤差、電離層誤差和地球自轉(zhuǎn)引起的偏差。
標(biāo)簽： GNSS 軟件接收機(jī) 原型 系統(tǒng)開發(fā)
上傳時(shí)間： 2013-11-20
上傳用戶：x4587
Single-Ended and Differential S-Parameters Differential circuits have been important incommunication systems for many years. In the past,differential communication circuits operated at lowfrequencies, where they could be designed andanalyzed using lumped-element models andtechniques. With the frequency of operationincreasing beyond 1GHz, and above 1Gbps fordigital communications, this lumped-elementapproach is no longer valid, because the physicalsize of the circuit approaches the size of awavelength.Distributed models and analysis techniques are nowused instead of lumped-element techniques.Scattering parameters, or S-parameters, have beendeveloped for this purpose [1]. These S-parametersare defined for single-ended networks. S-parameterscan be used to describe differential networks, but astrict definition was not developed until Bockelmanand others addressed this issue [2]. Bockelman’swork also included a study on how to adapt single-ended S-parameters for use with differential circuits[2]. This adaptation, called “mixed-mode S-parameters,” addresses differential and common-mode operation, as well as the conversion betweenthe two modes of operation.This application note will explain the use of single-ended and mixed-mode S-parameters, and the basicconcepts of microwave measurement calibration.
上傳時(shí)間： 2014-03-25
上傳用戶：yyyyyyyyyy
虛擬儀器技術(shù)（NI）就是利用高性能的模塊化硬件，結(jié)合高效靈活的軟件來完成各種測試、測量和自動(dòng)化的應(yīng)用。靈活高效的軟件能幫助您創(chuàng)建完全自定義的用戶界面，模塊化的硬件能方便地提供全方位的系統(tǒng)集成，標(biāo)準(zhǔn)的軟硬件平臺(tái)能滿足對(duì)同步和定時(shí)應(yīng)用的需求。這也正是NI近30年來始終引領(lǐng)測試測量行業(yè)發(fā)展趨勢的原因所在。只有同時(shí)擁有高效的軟件、模塊化I/O硬件和用于集成的軟硬件平臺(tái)這三大組成部分，才能充分發(fā)揮虛擬儀器技術(shù)性能高、擴(kuò)展性強(qiáng)、開發(fā)時(shí)間少，以及出色的集成這四大優(yōu)勢。 軟件是虛擬儀器技術(shù)中最重要的部份。使用正確的軟件工具并通過調(diào)用特定的程序模塊，工程師和科學(xué)家們可以高效地創(chuàng)建自己的應(yīng)用以及友好的人機(jī)交互界面。NI公司提供的行業(yè)標(biāo)準(zhǔn)的圖形化編程軟件——NI LabVIEW，不僅能輕松方便地完成與各種軟硬件的連接，更能提供強(qiáng)大的數(shù)據(jù)處理能力，并將分析結(jié)果有效地顯示給用戶。此外，NI還提供了許多其它交互式的測量工具和系統(tǒng)管理軟件工具，例如連接設(shè)計(jì)與測試的交互式軟件SignalExpress、基于ANSI-C語言的LabWindows/CVI、支持微軟Visual Studio的Measurement Studio等等，這些軟件均可滿足客戶對(duì)高性能應(yīng)用的需求。
上傳時(shí)間： 2013-11-24
上傳用戶：1583060504
PCB methodologies originated in the United States.Units of measurement are therefore typically in Imperial units, not SI/metric units.
標(biāo)簽： 布局技術(shù)
上傳時(shí)間： 2013-11-21
上傳用戶：Tracey
為了提高直接轉(zhuǎn)矩控制（DTC）系統(tǒng)定子磁鏈估計(jì)精度，降低電流、電壓測量的隨機(jī)誤差，提出了一種基于擴(kuò)展卡爾曼濾波（EKF）實(shí)現(xiàn)異步電機(jī)轉(zhuǎn)子位置和速度估計(jì)的方法。擴(kuò)展卡爾曼濾波器是建立在基于旋轉(zhuǎn)坐標(biāo)系下由定子電流、電壓、轉(zhuǎn)子轉(zhuǎn)速和其它電機(jī)參量所構(gòu)成的電機(jī)模型上，將定子電流、定子磁鏈、轉(zhuǎn)速和轉(zhuǎn)子角位置作為狀態(tài)變量，定子電壓為輸入變量，定子電流為輸出變量，通過對(duì)磁鏈和轉(zhuǎn)速的閉環(huán)控制提高定子磁鏈的估計(jì)精度，實(shí)現(xiàn)了異步電機(jī)的無速度傳感器直接轉(zhuǎn)矩控制策略，仿真結(jié)果驗(yàn)證了該方法的可行性,提高了直接轉(zhuǎn)矩的控制性能。 Abstract: In order to improve the Direct Torque Control（DTC） system of stator flux estimation accuracy and reduce the current， voltage measurement of random error， a novel method to estimate the speed and rotor position of asynchronous motor based on extended Kalman filter was introduced. EKF was based on d-p axis motor and other motor parameters （state vector: stator current， stator flux linkage， rotor angular speed and position； input: stator voltage； output: staror current). EKF was designed for stator flux and rotor speed estimation in close-loop control. It can improve the estimated accuracy of stator flux. It is possible to estimate the speed and rotor position and implement asynchronous motor drives without position and speed sensors. The simulation results show it is efficient and improves the control performance.
標(biāo)簽： EKF 異步電機(jī) 直接轉(zhuǎn)矩 控制系統(tǒng)
上傳時(shí)間： 2015-01-02
上傳用戶：qingdou
ACPR (adjacent channel power ratio), AltCPR (alternatechannel power ratio), and noise are important performancemetrics for digital communication systems thatuse, for example, WCDMA (wideband code division multipleaccess) modulation. ACPR and AltCPR are bothmeasures of spectral regrowth. The power in the WCDMAcarrier is measured using a 5MHz measurement bandwidth;see Figure 1. In the case of ACPR, the total powerin a 3.84MHz bandwidth centered at 5MHz (the carrierspacing) away from the center of the outermost carrier ismeasured and compared to the carrier power. The resultis expressed in dBc. For AltCPR, the procedure is thesame, except we center the measurement 10MHz awayfrom the center of the outermost carrier.
標(biāo)簽： AltCPR WCDMA 5528 ACPR
上傳時(shí)間： 2013-11-02
上傳用戶：maricle
Accurate measurement of the third order intercept pointfor low distortion IC products such as the LT5514 requirescertain precautions to be observed in the test setup andtesting procedure. The LT5514 linearity performance ishigh enough to push the test equipment and test set-up totheir limits. A method for accurate measurement of thirdorder intermodulation products, IM3, with standard testequipment is outlined below.It is also important to correctly interpret the LT5514specification with respect to ROUT, and the impact ofdemo-board transmission-line termination loss whenevaluating the linearity performance, as explained in theLT5514 Datasheet and in Note 1 of this document.
標(biāo)簽： 5514 LT 三階互調(diào) 精確測量
上傳時(shí)間： 2013-11-14
上傳用戶：l254587896
LabVIEW2011已經(jīng)發(fā)布，可以到官網(wǎng)下簡體載中文版的，http://download.ni.com/support/softlib/，但對(duì)于注冊(cè)機(jī)來說，許多剛接觸這款注冊(cè)機(jī)的朋友并不太會(huì)用，其與以往的LabVIEW注冊(cè)機(jī)不太一樣，這款注冊(cè)機(jī)要比以往的注冊(cè)機(jī)功能上強(qiáng)大許多，如果會(huì)用它可以注冊(cè)NI 2011系列所有的軟件LabWindows Measurement-Studio等等，針對(duì)網(wǎng)上許多朋友提出不會(huì)使用這種情況，我在這里以破解LabVIEW 2011為例，給大家示范一下，其他軟件也一樣。
標(biāo)簽： Activator License NI 注冊(cè)機(jī)
上傳時(shí)間： 2014-01-22
上傳用戶：gdgzhym
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