Calculation of the Differential Impedance of Tracks on FR4 substrates There is a discrepancy between calculated and measured values of impedance for differential transmission lineson FR4. This is especially noticeable in the case of surface microstrip configurations. The anomaly is shown tobe due to the nature of the substrate material. This needs to be considered as a layered structure of epoxy resinand glass fibre. Calculations, using Boundary Element field methods, show that the distribution of the electricfield within this layered structure determines the apparent dielectric constant and therefore affects theimpedance. Thus FR4 cannot be considered to be uniform dielectric when calculating differential impedance.
上傳時間： 2013-10-18
上傳用戶：masochism
微電腦型RS-485顯示電表（24*48mm/48*96mm） 特點： 5位數(shù)RS-485顯示電表 顯示范圍-19999-99999位數(shù) 通訊協(xié)議Modbus RTU模式 寬范圍交直流兩用電源設(shè)計 尺寸小,穩(wěn)定性高 主要規(guī)格： 顯示范圍:-19999~99999 digit RS-485傳輸速度: 19200/9600/4800/2400 selective RS-485通訊位址: "01"-"FF" RS-485通訊協(xié)議: Modbus RTU mode 顯示幕: Red high efficiency LEDs high 10.16 mm (0.4") (MMX-RS-11X) Red high efficiency LEDs high 20.32 mm (0.8") (MMX-RS-12X) Red high efficiency LEDs high 10.16 mm (0.4")x2 (MMX-RS-22X) 參數(shù)設(shè)定方式: Touch switches 記憶方式: Non-volatile E²PROM memory 絕緣耐壓能力: 2KVac/1 min. (input/power) 使用環(huán)境條件: 0-50℃(20 to 90% RH non-condensed) 存放環(huán)境條件: 0-70℃(20 to 90% RH non-condensed) CE認(rèn)證: EN 55022:1998/A1:2000 Class A EN 61000-3-2:2000 EN 61000-3-3:1995/A1:2001 EN 55024:1998/A1:2001
上傳時間： 2015-01-03
上傳用戶：feitian920
微電腦型單相交流集合式電表（單相二線系統(tǒng)） 特點： 精確度0.25%滿刻度±1位數(shù) 可同時量測與顯示交流電壓,電流,頻率,瓦特,(功率因數(shù)/視在功率) 交流電壓,電流,瓦特皆為真正有效值(TRMS) 交流電流,瓦特之小數(shù)點可任意設(shè)定 瓦特單位W或KW可任意設(shè)定 CT比可任意設(shè)定(1至999) 輸入與輸出絕緣耐壓 2仟伏特/1分鐘( 突波測試強度4仟伏特(1.2x50us) 數(shù)位RS-485界面 (Optional) 主要規(guī)格： 精確度: 0.1% F.S.±1 digit (Frequency) 0.25% F.S.±1 digit(ACA,ACV,Watt,VA) 0.25% F.S. ±0.25o(Power Factor) (-.300~+.300) 輸入負(fù)載: <0.2VA (Voltage) <0.2VA (Current) 最大過載能力: Current related input: 3 x rated continuous 10 x rated 30 sec. 25 x rated 3sec. 50 x rated 1sec. Voltage related input: maximum 2 x rated continuous 過載顯示: "doFL" 顯示值范圍: 0~600.0V(Voltage) 0~999.9Hz(Frequency)(<20% for voltage input) 0~19999 digit adjustable(Current,Watt,VA) 取樣時間: 2 cycles/sec. RS-485通訊位址: "01"-"FF" RS-485傳輸速度: 19200/9600/4800/2400 selective RS-485通信協(xié)議: Modbus RTU mode 溫度系數(shù): 100ppm/℃ (0-50℃) 顯示幕: Red high efficiency LEDs high 10.16 mm(0.4") 參數(shù)設(shè)定方式: Touch switches 記憶型式: Non-volatile E²PROM memory 絕緣抗阻: >100Mohm with 500V DC 絕緣耐壓能力: 2KVac/1 min. (input/output/power) 1600 Vdc (input/output) 突波測試: ANSI c37.90a/1974,DIN-IEC 255-4 impulse voltage 4KV(1.2x50us) 使用環(huán)境條件: 0-50℃(20 to 90% RH non-condensed) 存放環(huán)境條件: 0-70℃(20 to 90% RH non-condensed) CE認(rèn)證: EN 55022:1998/A1:2000 Class A EN 61000-3-2:2000 EN 61000-3-3:1995/A1:2001 EN 55024:1998/A1:2001
上傳時間： 2015-01-03
上傳用戶：幾何公差
集合式直流電能表（小功率的） 特點： 精確度0.05%滿刻度±1位數(shù) 可同時量測與顯示/直流電壓/電流/瓦特（千瓦）/瓦特小時（千瓦小時） 電壓輸入（DC0-99.99V/0-600.0V）自動變檔功能 顯示范圍0-9999(電流/瓦特/千瓦),0至99999999(八位數(shù)瓦特小時)可任意規(guī)劃 數(shù)位RS-485 界面 (Optional) 主要規(guī)格： 輔助電源消耗功率：＜0.35VA(DC12V/DC24V) ＜0.5VA（DC48V） ＜1.5VA（AC90-240V(50/60Hz)） 精確度: 0.05% F.S. ±1 digit (23 ±5℃) 輸入范圍：Auto range(DC0-99.99V/0-600.0V(DC voltage)) 輸入抗阻：＞5MΩ（DC voltage） 取樣時間：10 cycles/second(total) 過載顯示: " doFL " 顯示值范圍: 0-9999 digit（DCA/W(KW)） 0-9999999.999 digit(WH/(KWH)) RS-485傳輸速度: 19200/9600/4800/2400 selective RS-485通訊位址: "01"-"FF"（0-255） RS-485通信協(xié)議: Modbus RTU mode 溫度系數(shù): 50ppm/℃ (0-50℃) 顯示幕:Bight Red LEDs high 10.16 mm(0.4") 參數(shù)設(shè)定方式: Touch switches 記憶方式: Non-volatile E²PROM memory 絕緣耐壓能力:2KVac/1min.(input/output)（RS-485(Isolating)） 1600 Vdc (input/output) （RS-485(Isolating)） 使用環(huán)境條件: 0-50℃(20 to 90% RH non-condensed) 存放環(huán)境條件: 0-70℃(20 to 90% RH non-condensed) CE認(rèn)證: EN 55022:1998/A1:2000 Class A EN 61000-3-2:2000 EN 61000-3-3:1995/A1:2001 EN 55024:1998/A1:2001
上傳時間： 2013-11-20
上傳用戶：s363994250
Locally weighted polynomial regression LWPR is a popular instance based al gorithm for learning continuous non linear mappings For more than two or three in puts and for more than a few thousand dat apoints the computational expense of pre dictions is daunting We discuss drawbacks with previous approaches to dealing with this problem
標(biāo)簽： polynomial regression weighted instance
上傳時間： 2013-11-28
上傳用戶：sunjet
UnZip is a small zipfile extract utility. It is written to be assmall portable as possible and is intended to be starting point for im-plementation of .ZIP files in non-IBM environments.Source code is provided in C and Turbo Pascal. If you port this programto a non-IBM system, I would appreciate a copy of the ported source andexe files.
標(biāo)簽： is portable possible extract
上傳時間： 2014-01-20
上傳用戶：維子哥哥
gperiodic is a program for browsing the periodic table and looking up data for different elements. It also features a non-graphical interface. gperiodicOrb是一個瀏覽元素周期表和查詢不同元素的數(shù)據(jù)的程序。它有一個非圖形化的界面。
標(biāo)簽： gperiodic for different browsing
上傳時間： 2013-12-25
上傳用戶：亞亞娟娟123
Client/Server版本 DBISAM compiles directly into your application with no external libraries required. Runtime package support is also provided if so desired. It has a very small footprint and does not require any forms support in Delphi 6, C++Builder 6, and Kylix 2 and higher, which helps keep the size of non-UI applications like services or web applications to a minimum.
標(biāo)簽： application libraries compiles directly
上傳時間： 2015-04-04
上傳用戶：sz_hjbf
prolog 找路例子程序： === === === === === === Part 1-Adding connections Part 2-Simple Path example | ?- path1(a,b,P,T). will produce the response: T = 15 P = [a,b] ? Part 3 - Non-repeating path As an example, the query: ?- path2(a,h,P,T). will succeed and may produce the bindings: P = [a,depot,b,d,e,f,h] T = 155 Part 4 - Generating a path below a cost threshold As an example, the query: ?- path_below_cost(a,[a,b,c,d,e,f,g,h],RS,300). returns: RS = [a,b,depot,c,d,e,g,f,h] ? RS = [a,c,depot,b,d,e,g,f,h] ? no ==================================
標(biāo)簽： Part connections example prolog
上傳時間： 2015-04-24
上傳用戶：ljt101007
The subject which is to us propos¨¦ is as follows: calculation of the degr¨¦ d¡ ¯ inconsistance d¡ ¯ un logical program possibilist in C++. We thus work on a logical program possibilist, it be-¨¤-statement a logical program resulting from non-classique logic. The goal first of this project is of d¨¦ terminer if a logical program is consisting or not of share the calculation of sound degr¨¦ d¡ ¯ inconsistance.
標(biāo)簽： brvbar calculation subject follows
上傳時間： 2013-12-18
上傳用戶：yulg
蟲蟲下載站版權(quán)所有 京ICP備2021023401號-1
