Road vehicles -- Component test methods for electrical disturbances from narrowband radiated electromagnetic energy -- Part 4: Harness excitation methods
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計PART 3印刷電路板layout技術附錄A EMC術語表附錄B 抗干擾測量標準第一部分 EMI和EMC縱覽:在現代電子設計中EMI是一個主要的問題。為抗干擾,設計者嬰么除掉干擾源,要么保護受影響的電路,最終的目的都是為了達到電磁兼容的目的僅僅達到電磁兼容也許還不夠。雖然電路工作在板級,但它有可能對系統的共他部件輻射噪音、干擾,從而引起系統級的問題。此外,系統毅或者設備級的EMC不得不滿足某些輻射標準,以便不影響其他設備。許多發達國家在電子產品上有非常嚴格的EMC標準。為了達到這些要求,設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
標簽: XC8
上傳時間: 2022-06-21
上傳用戶:
單片機課程設計 籃球記分器 LANE STUDIO CONTENT 1 2 3 4 5 系統功能 課題運用的知識點 系統原理的設計 硬件部分的設計 軟件部分設計 1 系統功能 PART 1 PART 1 隨著科技的迅猛發展,單片機在計算機應用領域中起到了越來越重要的作用. 單片機體積小,功能強,集成了微型機的各部件,大大縮短了系統內信號傳送的距離,從而提高了系統的可靠性及運行速度。 該系統主要是實現以下幾種功能: ① 計分:能同時顯示甲、乙兩隊比分,最大計分數為99。能分別對甲、乙兩隊比分進行加分。 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, 經過修改后應該還能實施計時暫停,還能設定為倒計時。 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:設定的比賽時間到了,能自動哨音提示比賽結束. PART 1 2 課題運用的知識點 PART 1 PART 2 1 2 3 人機接口 AT89C51單片機的運用 LED數碼管的運用 本課題主要運用單片機設計知識設計籃球賽記時計分器,因此涉及到的知識點主要有以下幾點: 3 系統原理的設計 PART 3 按 鈕 單片機芯 片 時間顯示 比分顯示 為了實現原理圖的設計目標,同時結合自己獲取的各種資料以及要達到的具體功能,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 硬件部分的設計 PART 4 單片機接口電路 復位電路 1 復位是指單片機的CPU或系統中其它的部件處于某一確定的初試狀態,并從這一狀態開始工作。除了進入系統的正常初始化之外,當由于程序運行出錯或是操作錯誤使系統處于鎖死狀態,為擺脫困境,需要進行按鍵復位。 通常單片機的復位操作有上電復位、信號復位、運行監視復位,運行監視復位有程序運行監視和電源監視。 在本設計中,則是采用上電復位,原理是當電源接通后,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,當高電平維持在兩個機械周期以上則單片機能被復位。 PART 4 2 晶體振蕩電路 晶體振蕩電路用于產生單片機工作時所需的時鐘信號,從而保證各部分工作的同步。單片機內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電容就可以構成一個穩定的自激震蕩器并在單片機內部產生的時鐘脈沖信號。電容器C1與C2用于穩定頻率和快速起振,電容一般在5PF—30PF,本設計電容為30PF。 PART 4 3 鍵盤接口電路 與通用單片機相比,單片機應用系統中的鍵盤種類很多,鍵盤中按鍵數量設置依系統操作要求而定。單片機應用系統中的鍵盤有獨立式和行列式兩種。
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
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.
標簽: AC101
上傳時間: 2022-06-28
上傳用戶:xsr1983
如何使Cir文件進行PSPice仿真當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”文件進行仿真。以AD620.cir為例:1.下載Cir文件:從AD的網站上下載AD的cir格式文件,內容如下: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測試的相關標準,主要為:歐規(EN55022),美規(FCC)相關名詞:非故意輻射(Unintentional):產品產生不想要的電磁波輻射,造成干擾;如:電腦,LCD Monitor,DVD,電視,投影機等;故意輻射(intentional):使用無線電波進行通信;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測試參考標準:歐盟:EN55022(EMI參考測試標準);EN55024(EMS參考測試標準);美國:FCC Part 15B(EMI參考測試標準);臺灣:CNS13438(EMl參考測試標準)二、測試EMI 測試定義:測試待測物EUT產生的輻射干擾強度,分為RE測試和CE測試兩種。1)、RE測試:量測EUT產生的輻射干擾,其測試頻率范圍:30MHZ~1GHZ。測試方法:參考相關測試標準EN55022或者其他測試標準;測試距離及場合:10米量測,在開放式場合;測試方式:量測EUT產生的電磁波輻射(30MHZ~1GHZ).2)、CE測試:量測EUT產生的傳導輻射干擾,其測試頻率范圍:150K~30MHZ.測試方法:參考相關測試標準EN55022或者其他測試標準;
標簽: emi測試
上傳時間: 2022-07-24
上傳用戶:bluedrops