Road vehicles -- Component test methods for electrical disturbances from narrowband radiated electromagnetic energy -- part 4: Harness excitation methods
標(biāo)簽： iso11452 標(biāo)準(zhǔn)
上傳時間： 2022-04-26
上傳用戶：qingfengchizhu
Mathematical modeling has become an important part of the research and devclopment work in engineering and scicnce. Retaining a competitive edge requiresa fast path between ideas and prototypes, and in this regard mathematical modeling and simulation provide a valuable shortcut for understanding both qualitative and quantitative aspects of scientific and engineering design. To assist you in gaining this edge, COMSOL Multiphysics offers state-of-the art performance, being built from the ground up with a Java3D interface and C/C++ solvers.The Acoustics Module is an optional package that extends the COMSOL Multiphysicsmodcling cnvironment with customized user interfaces and functionality optimizcd for the analysis of acoustics. Like all modules in the COMSOL family, it provides a brary of prewritten ready-to-run models that make it quicker and casier to analyze disciplinc-specific problcms.
上傳時間： 2022-06-19
上傳用戶：
說明：原文（英語）來自Freescale Semiconductor，Inc.的應(yīng)用文檔，作者，T.C.Lun，Applications Engineering，Microcontroller Division，Hong Kong.文檔分為下列幾個部分：part 1 觀EMC part 2器件的選擇及電路的設(shè)計part 3印刷電路板layout技術(shù)附錄A EMC術(shù)語表附錄B 抗干擾測量標(biāo)準(zhǔn)第一部分 EMI和EMC縱覽：在現(xiàn)代電子設(shè)計中EMI是一個主要的問題。為抗干擾，設(shè)計者嬰么除掉干擾源，要么保護(hù)受影響的電路，最終的目的都是為了達(dá)到電磁兼容的目的僅僅達(dá)到電磁兼容也許還不夠。雖然電路工作在板級，但它有可能對系統(tǒng)的共他部件輻射噪音、干擾，從而引起系統(tǒng)級的問題。此外，系統(tǒng)毅或者設(shè)備級的EMC不得不滿足某些輻射標(biāo)準(zhǔn)，以便不影響其他設(shè)備。許多發(fā)達(dá)國家在電子產(chǎn)品上有非常嚴(yán)格的EMC標(biāo)準(zhǔn)。為了達(dá)到這些要求，設(shè)計者必須考慮從板極開始的EMI抑制。一個簡單的EMI模型包含三個元素，如圖1所示：1.EMI源2.耦合路徑3.感應(yīng)體
上傳時間： 2022-06-20
上傳用戶：
PIC XC8 V1.41 PRO版，編譯器破解文件，將附件文件覆蓋編譯器bin目錄下原文件即可。你懂的。。。。。。。編譯前把編譯選項的Free改成PRO和諧文件在MPLAB X IDE v5.00版本測試成功清除已成功 (總時間： 10ms)make -f nbproject/Makefile-default.mk SUBPROJECTS= .build-confmake -f nbproject/Makefile-default.mk dist/default/production/KEY_V1.X.production.hexMicrochip MPLAB XC8 C Compiler (PRO Mode) V1.41Build date: Jan 24 2017part Support Version: 1.41Copyright (C) 2017 Microchip Technology Inc.Memory Summary: Program space used 2A9h ( 681) of 1000h words ( 16.6%) Data space used 4Dh ( 77) of 100h bytes ( 30.1%) EEPROM space used 0h ( 0) of 100h bytes ( 0.0%) Data stack space used 0h ( 0) of AEh bytes ( 0.0%) Configuration bits used 2h ( 2) of 2h words (100.0%) ID Location space used 0h ( 0) of 4h bytes ( 0.0%)編譯已成功 (總時間： 2s)正在加載代碼...加載完成
標(biāo)簽： XC8
上傳時間： 2022-06-21
上傳用戶：
單片機(jī)課程設(shè)計 籃球記分器 LANE STUDIO CONTENT 1 2 3 4 5 系統(tǒng)功能 課題運(yùn)用的知識點(diǎn) 系統(tǒng)原理的設(shè)計 硬件部分的設(shè)計 軟件部分設(shè)計 1 系統(tǒng)功能 part 1 part 1 隨著科技的迅猛發(fā)展,單片機(jī)在計算機(jī)應(yīng)用領(lǐng)域中起到了越來越重要的作用. 單片機(jī)體積小,功能強(qiáng),集成了微型機(jī)的各部件,大大縮短了系統(tǒng)內(nèi)信號傳送的距離,從而提高了系統(tǒng)的可靠性及運(yùn)行速度。 該系統(tǒng)主要是實現(xiàn)以下幾種功能： ① 計分：能同時顯示甲、乙兩隊比分,最大計分?jǐn)?shù)為99。能分別對甲、乙兩隊比分進(jìn)行加分。 ② 計時：從比賽開始時啟動計時工作方式,初始時間為00,最大計時為99 分鐘， 經(jīng)過修改后應(yīng)該還能實施計時暫停,還能設(shè)定為倒計時。 ③ 交換比分：中場交換比賽場地時，能交換甲、乙兩隊比分的位置。 ④ 哨音提示：設(shè)定的比賽時間到了,能自動哨音提示比賽結(jié)束. part 1 2 課題運(yùn)用的知識點(diǎn) part 1 part 2 1 2 3 人機(jī)接口 AT89C51單片機(jī)的運(yùn)用 LED數(shù)碼管的運(yùn)用 本課題主要運(yùn)用單片機(jī)設(shè)計知識設(shè)計籃球賽記時計分器，因此涉及到的知識點(diǎn)主要有以下幾點(diǎn)： 3 系統(tǒng)原理的設(shè)計 part 3 按 鈕 單片機(jī)芯 片 時間顯示 比分顯示 為了實現(xiàn)原理圖的設(shè)計目標(biāo)，同時結(jié)合自己獲取的各種資料以及要達(dá)到的具體功能，所確定的組成框圖如圖。 一、組成框圖的組成說明 二、組成框圖的組成及其功能說明 1、LED能夠顯示比賽成績和比賽時間，并且能夠顯示調(diào)整后的比賽成績和時間 2、控制按鈕由兩隊的加分按鈕組成、以中場中止按鈕組成。 3、暫停比賽時間 4 硬件部分的設(shè)計 part 4 單片機(jī)接口電路 復(fù)位電路 1 復(fù)位是指單片機(jī)的CPU或系統(tǒng)中其它的部件處于某一確定的初試狀態(tài)，并從這一狀態(tài)開始工作。除了進(jìn)入系統(tǒng)的正常初始化之外，當(dāng)由于程序運(yùn)行出錯或是操作錯誤使系統(tǒng)處于鎖死狀態(tài)，為擺脫困境，需要進(jìn)行按鍵復(fù)位。 通常單片機(jī)的復(fù)位操作有上電復(fù)位、信號復(fù)位、運(yùn)行監(jiān)視復(fù)位，運(yùn)行監(jiān)視復(fù)位有程序運(yùn)行監(jiān)視和電源監(jiān)視。 在本設(shè)計中，則是采用上電復(fù)位，原理是當(dāng)電源接通后，上電瞬間RESET引腳獲取高電平，該高電平需要電容充電來維持，當(dāng)高電平維持在兩個機(jī)械周期以上則單片機(jī)能被復(fù)位。 part 4 2 晶體振蕩電路 晶體振蕩電路用于產(chǎn)生單片機(jī)工作時所需的時鐘信號，從而保證各部分工作的同步。單片機(jī)內(nèi)部有一個高增益反相反大器，只要在輸入端XTAL1與輸出XTAL2之間掛一個晶體振蕩器和微調(diào)電容就可以構(gòu)成一個穩(wěn)定的自激震蕩器并在單片機(jī)內(nèi)部產(chǎn)生的時鐘脈沖信號。電容器C1與C2用于穩(wěn)定頻率和快速起振，電容一般在5PF—30PF，本設(shè)計電容為30PF。 part 4 3 鍵盤接口電路 與通用單片機(jī)相比，單片機(jī)應(yīng)用系統(tǒng)中的鍵盤種類很多，鍵盤中按鍵數(shù)量設(shè)置依系統(tǒng)操作要求而定。單片機(jī)應(yīng)用系統(tǒng)中的鍵盤有獨(dú)立式和行列式兩種。
上傳時間： 2022-06-22
上傳用戶：canderile
ISO16750-3-2012原版PDF，高清文字版。Road vehicles — Environmental conditions and testing for electrical and electronic equipment — part 3: Mechanical loads
標(biāo)簽： iso16750 機(jī)械負(fù)荷
上傳時間： 2022-06-23
上傳用戶：
This documentation is the original work and copyrighted property of X-Powers. Reproduction in whole orin part must obtain the written approval of X-Powers and give clear acknowledgement to the copyrightowner.
標(biāo)簽： AC101
上傳時間： 2022-06-28
上傳用戶：xsr1983
如何使Cir文件進(jìn)行PSPice仿真當(dāng)Orcad仿真庫中找不到某些器件的時候，我們可以從這些器件的廠家網(wǎng)站上下載“.cir”格式的Spice Model，下面介紹一下如何使用這些“.cir”文件進(jìn)行仿真。以AD620.cir為例：1.下載Cir文件：從AD的網(wǎng)站上下載AD的cir格式文件，內(nèi)容如下：由PSPice Library 文件生成Capture Lib文件（.olb）File->Export to capture part library…本案例中源文件為：CAOrCADIOrCAD_10.5New_Lib_Files\AD620XAD620.Lib本案例中目標(biāo)文件為：C:\OrCAD\OrCAD_10.5\tools\capturelibrary\pspice\New_Models\AD620.olb在完成本操作后，就可以在Capture中使用AD620的庫繪制需要仿真的原理圖了。
上傳時間： 2022-07-03
上傳用戶：
PrefaceDuring the past years, there has been a quickly rising interest in radio access technologies for providingmobile as well as nomadic and fixed services for voice, video, and data. The difference indesign, implementation, and use between telecom and datacom technologies is also becoming moreblurred. One example is cellular technologies from the telecom world being used for broadband dataand wireless LAN from the datacom world being used for voice-over IP.Today, the most widespread radio access technology for mobile communication is digital cellular,with the number of users passing 5 billion by 2010, which is more than half of the world’s population.It has emerged from early deployments of an expensive voice service for a few car-borne users,to today’s widespread use of mobile-communication devices that provide a range of mobile servicesand often include camera, MP3 player, and PDA functions. With this widespread use and increasinginterest in mobile communication, a continuing evolution ahead is foreseen.This book describes LTE, developed in 3GPP (Third Generation partnership Project) and providingtrue 4G broadband mobile access, starting from the first version in release 8 and through the continuingevolution to release 10, the latest version of LTE. Release 10, also known as LTE-Advanced,is of particular interest as it is the major technology approved by the ITU as fulfilling the IMTAdvancedrequirements. The description in this book is based on LTE release 10 and thus provides acomplete description of the LTE-Advanced radio access from the bottom up.Chapter 1 gives the background to LTE and its evolution, looking also at the different standardsbodies and organizations involved in the process of defining 4G. It also gives a discussion of the reasonsand driving forces behind the evolution.Chapters 2–6 provide a deeper insight into some of the technologies that are part of LTE and itsevolution. Because of its generic nature, these chapters can be used as a background not only for LTEas described in this book, but also for readers who want to understand the technology behind othersystems, such as WCDMA/HSPA, WiMAX, and CDMA2000.Chapters 7–17 constitute the main part of the book. As a start, an introductory technical overviewof LTE is given, where the most important technology components are introduced based onthe generic technologies described in previous chapters. The following chapters provide a detaileddescription of the protocol structure, the downlink and uplink transmission schemes, and the associatedmechanisms for scheduling, retransmission and interference handling. Broadcast operation andrelaying are also described. This is followed by a discussion of the spectrum flexibility and the associated
上傳時間： 2022-07-08
上傳用戶：
一、簡介目前，涉及到EMI測試的相關(guān)標(biāo)準(zhǔn)，主要為：歐規(guī)（EN55022），美規(guī)（FCC）相關(guān)名詞：非故意輻射（Unintentional）：產(chǎn)品產(chǎn)生不想要的電磁波輻射，造成干擾；如：電腦，LCD Monitor，DVD，電視，投影機(jī)等；故意輻射（intentional）：使用無線電波進(jìn)行通信；FCC只測試EMl：RE（輻射干擾）：測試頻率范圍30MHZ~1GHZ；CE（電源干擾）：測試頻率范圍150KHZ~30MHZ；主要的EMI測試參考標(biāo)準(zhǔn)：歐盟：EN55022（EMI參考測試標(biāo)準(zhǔn)）；EN55024（EMS參考測試標(biāo)準(zhǔn)）；美國：FCC part 15B（EMI參考測試標(biāo)準(zhǔn)）；臺灣：CNS13438（EMl參考測試標(biāo)準(zhǔn)）二、測試EMI 測試定義：測試待測物EUT產(chǎn)生的輻射干擾強(qiáng)度，分為RE測試和CE測試兩種。1）、RE測試：量測EUT產(chǎn)生的輻射干擾，其測試頻率范圍：30MHZ~1GHZ。測試方法：參考相關(guān)測試標(biāo)準(zhǔn)EN55022或者其他測試標(biāo)準(zhǔn)；測試距離及場合：10米量測，在開放式場合；測試方式：量測EUT產(chǎn)生的電磁波輻射（30MHZ~1GHZ）.2）、CE測試：量測EUT產(chǎn)生的傳導(dǎo)輻射干擾，其測試頻率范圍：150K~30MHZ.測試方法：參考相關(guān)測試標(biāo)準(zhǔn)EN55022或者其他測試標(biāo)準(zhǔn)；
標(biāo)簽： emi測試
上傳時間： 2022-07-24
上傳用戶：bluedrops
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