微電腦型單相交流集合式電表（單相二線系統(tǒng)） 特點(diǎn)： 精確度0.25%滿刻度±1位數(shù) 可同時(shí)量測(cè)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(diǎn)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(cè)試強(qiáng)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(guò)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(guò)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(shí)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(cè)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(shí)間： 2015-01-03
上傳用戶：幾何公差
特點(diǎn)： 精確度0.25%滿刻度±1位數(shù) 可量測(cè)交流瓦特/乏爾/功率因數(shù)/相角 顯示范圍0- ±19999可任意規(guī)劃 輸入與輸出絕緣耐壓2仟伏特/1分鐘(input/output/power)) 突波測(cè)試強(qiáng)度4仟伏特(1.2x50us) 2組警報(bào)功能 (Optional) 15BIT類比輸出功能 (Optional) 數(shù)位RS-485界面 (Optional)
上傳時(shí)間： 2013-11-08
上傳用戶：330402686
Abstract: Many modern industrial, medical, and commercial applications require temperature measurements in the extended temperature rangewith accuracies of ±0.3°C or better, performed with reasonable cost and often with low power consumption. This article explains how platinumresistance temperature detectors (PRTDs) can perform measurements over wide temperature ranges of -200°C to +850°C, with absolute accuracyand repeatability better than ±0.3°C, when used with modern processors capable of resolving nonlinear mathematical equation quickly and costeffectively. This article is the second installment of a series on PRTDs. For the first installment, please read application note 4875, "High-Accuracy Temperature Measurements Call for Platinum Resistance Temperature Detectors (PRTDs) and Precision Delta-Sigma ADCs."
標(biāo)簽： PRTDs ADC 高精度 溫度測(cè)量
上傳時(shí)間： 2013-11-06
上傳用戶：WMC_geophy
Modern electronic systems solve so many difficult problems that they often seem like magic. Nonetheless, these systems all have thesame basic limitation: they need a source of electrical power! Most of the time this is a straightforward challenge for the electronicdesigner, because there are many power-delivery solutions. Yet sometimes a device has no direct power source, and running wiresor replacing batteries is impractical. Even when long-life batteries are usable, they eventually need to be replaced, which requires aservice call.
標(biāo)簽： 能量收集
上傳時(shí)間： 2015-01-03
上傳用戶：zukfu
因?yàn)闇y(cè)量系統(tǒng)都用50歐姆, 如非特指, 以下所說(shuō)的Gain均指功率增益(Power Gain). 但是一般的接收機(jī)的輸入輸出并非50歐姆, 因此有必要考慮電壓增益(Voltage Gain).
上傳時(shí)間： 2015-01-03
上傳用戶：1318695663
Have you had the exasperating experience of a laptop orPDA defi antly not responding to your commands? Youfrantically press key after key, but to no avail. As hopeturns to anger (but just before you throw the company’slaptop through the window) you slam your fi nger againstthe on/off power button. Ten seconds later, your laptopfi nally surrenders and the screen goes black in a highpitched whimper.
標(biāo)簽： 427 DN 開(kāi)關(guān)控制器 故障保護(hù)
上傳時(shí)間： 2013-12-10
上傳用戶：Vici
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
Frequently, voltage reference stability and noise defi nemeasurement limits in instrumentation systems. In particular,reference noise often sets stable resolution limits.Reference voltages have decreased with the continuingdrop in system power supply voltages, making referencenoise increasingly important. The compressed signalprocessing range mandates a commensurate reductionin reference noise to maintain resolution. Noise ultimatelytranslates into quantization uncertainty in A to D converters,introducing jitter in applications such as scales, inertialnavigation systems, infrared thermography, DVMs andmedical imaging apparatus. A new low voltage reference,the LTC6655, has only 0.3ppm (775nV) noise at 2.5VOUT.Figure 1 lists salient specifi cations in tabular form. Accuracyand temperature coeffi cient are characteristic ofhigh grade, low voltage references. 0.1Hz to 10Hz noise,particularly noteworthy, is unequalled by any low voltageelectronic reference.
標(biāo)簽： 低噪聲 電壓基準(zhǔn) 噪聲測(cè)量
上傳時(shí)間： 2013-10-30
上傳用戶：wxhwjf
在Multisim 10軟件環(huán)境下，設(shè)計(jì)一種由運(yùn)算放大器構(gòu)成的精確可控矩形波信號(hào)發(fā)生器，結(jié)合系統(tǒng)電路原理圖重點(diǎn)闡述了各參數(shù)指標(biāo)的實(shí)現(xiàn)與測(cè)試方法。通過(guò)改變RC電路的電容充、放電路徑和時(shí)間常數(shù)實(shí)現(xiàn)了占空比和頻率的調(diào)節(jié)，通過(guò)多路開(kāi)關(guān)投入不同數(shù)值的電容實(shí)現(xiàn)了頻段的調(diào)節(jié)，通過(guò)電壓取樣和同相放大電路實(shí)現(xiàn)了輸出電壓幅值的調(diào)節(jié)并提高了電路的帶負(fù)載能力，可作為頻率和幅值可調(diào)的方波信號(hào)發(fā)生器。Multisim 10仿真分析及應(yīng)用電路測(cè)試結(jié)果表明，電路性能指標(biāo)達(dá)到了設(shè)計(jì)要求。 Abstract: Based on Multisim 10， this paper designed a kind of rectangular-wave signal generator which could be controlled exactly composed of operational amplifier， the key point was how to implement and test the parameter indicators based on the circuit diagram. The duty and the frequency were adjusted by changing the time constant and the way of charging and discharging of the capacitor， the width of frequency was adjusted by using different capacitors provided with multiple switch， the amplitude of output voltage was adjusted by sampling voltage and using in-phase amplifier circuit，the ability of driving loads was raised， the circuit can be used as squarewave signal generator whose frequency and amplitude can be adjusted. The final simulation results of Multisim 10 and the tests of applicable circuit show that the performance indicators of the circuit meets the design requirements.
標(biāo)簽： Multisim 矩形波 信號(hào)發(fā)生器 仿真
上傳時(shí)間： 2014-01-21
上傳用戶：shen007yue
multisim10.0仿真軟件破解版下載:【軟件介紹】 Multisim本是加拿大圖像交互技術(shù)公司（Interactive Image Technoligics簡(jiǎn)稱IIT公司)推出的以Windows為基礎(chǔ)的仿真工具，被美國(guó)NI公司收購(gòu)后，更名為NI Multisim ，而V10.0是其（即NI，National Instruments）最新推出的Multisim最新版本。 目前美國(guó)NI公司的EWB的包含有電路仿真設(shè)計(jì)的模塊Multisim、PCB設(shè)計(jì)軟件Ultiboard、布線引擎Ultiroute及通信電路分析與設(shè)計(jì)模塊Commsim 4個(gè)部分，能完成從電路的仿真設(shè)計(jì)到電路版圖生成的全過(guò)程。Multisim、Ultiboard、Ultiroute及Commsim 4個(gè)部分相互獨(dú)立，可以分別使用。Multisim、Ultiboard、Ultiroute及Commsim 4個(gè)部分有增強(qiáng)專業(yè)版（Power Professional）、專業(yè)版（Professional）、個(gè)人版（Personal）、教育版（Education）、學(xué)生版（Student）和演示版（Demo）等多個(gè)版本，各版本的功能和價(jià)格有著明顯的差異。 NI Multisim 10用軟件的方法虛擬電子與電工元器件，虛擬電子與電工儀器和儀表，實(shí)現(xiàn)了“軟件即元器件”、“軟件即儀器”。NI Multisim 10是一個(gè)原理電路設(shè)計(jì)、電路功能測(cè)試的虛擬仿真軟件。 NI Multisim 10的元器件庫(kù)提供數(shù)千種電路元器件供實(shí)驗(yàn)選用，同時(shí)也可以新建或擴(kuò)充已有的元器件庫(kù)，而且建庫(kù)所需的元器件參數(shù)可以從生產(chǎn)廠商的產(chǎn)品使用手冊(cè)中查到，因此也很方便的在工程設(shè)計(jì)中使用。 NI Multisim 10的虛擬測(cè)試儀器儀表種類齊全，有一般實(shí)驗(yàn)用的通用儀器，如萬(wàn)用表、函數(shù)信號(hào)發(fā)生器、雙蹤示波器、直流電源；而且還有一般實(shí)驗(yàn)室少有或沒(méi)有的儀器，如波特圖儀、字信號(hào)發(fā)生器、邏輯分析儀、邏輯轉(zhuǎn)換器、失真儀、頻譜分析儀和網(wǎng)絡(luò)分析儀等。 NI Multisim 10具有較為詳細(xì)的電路分析功能，可以完成電路的瞬態(tài)分析和穩(wěn)態(tài)分析、 時(shí)域和頻域分析、器件的線性和非線性分析、電路的噪聲分析和失真分析、離散傅里葉分析、電路零極點(diǎn)分析、交直流靈敏度分析等電路分析方法，以幫助設(shè)計(jì)人員分析電路的性能。 NI Multisim 10可以設(shè)計(jì)、測(cè)試和演示各種電子電路，包括電工學(xué)、模擬電路、數(shù)字電路、射頻電路及微控制器和接口電路等。可以對(duì)被仿真的電路中的元器件設(shè)置各種故障，如開(kāi)路、短路和不同程度的漏電等，從而觀察不同故障情況下的電路工作狀況。在進(jìn)行仿真的同時(shí)，軟件還可以存儲(chǔ)測(cè)試點(diǎn)的所有數(shù)據(jù)，列出被仿真電路的所有元器件清單，以及存儲(chǔ)測(cè)試儀器的工作狀態(tài)、顯示波形和具體數(shù)據(jù)等。 NI Multisim 10有豐富的Help功能，其Help系統(tǒng)不僅包括軟件本身的操作指南，更要的是包含有元器件的功能解說(shuō)，Help中這種元器件功能解說(shuō)有利于使用EWB進(jìn)行CAI教學(xué)。另外，NI Multisim10還提供了與國(guó)內(nèi)外流行的印刷電路板設(shè)計(jì)自動(dòng)化軟件Protel及電路仿真軟件PSpice之間的文件接口，也能通過(guò)Windows的剪貼板把電路圖送往文字處理系統(tǒng)中進(jìn)行編輯排版。支持VHDL和Verilog HDL語(yǔ)言的電路仿真與設(shè)計(jì)。 利用NI Multisim 10可以實(shí)現(xiàn)計(jì)算機(jī)仿真設(shè)計(jì)與虛擬實(shí)驗(yàn)，與傳統(tǒng)的電子電路設(shè)計(jì)與實(shí)驗(yàn)方法相比，具有如下特點(diǎn)：設(shè)計(jì)與實(shí)驗(yàn)可以同步進(jìn)行，可以邊設(shè)計(jì)邊實(shí)驗(yàn)，修改調(diào)試方便；設(shè)計(jì)和實(shí)驗(yàn)用的元器件及測(cè)試儀器儀表齊全，可以完成各種類型的電路設(shè)計(jì)與實(shí)驗(yàn)；可方便地對(duì)電路參數(shù)進(jìn)行測(cè)試和分析；可直接打印輸出實(shí)驗(yàn)數(shù)據(jù)、測(cè)試參數(shù)、曲線和電路原理圖；實(shí)驗(yàn)中不消耗實(shí)際的元器件，實(shí)驗(yàn)所需元器件的種類和數(shù)量不受限制，實(shí)驗(yàn)成本低，實(shí)驗(yàn)速度快，效率高；設(shè)計(jì)和實(shí)驗(yàn)成功的電路可以直接在產(chǎn)品中使用。 NI Multisim 10易學(xué)易用，便于電子信息、通信工程、自動(dòng)化、電氣控制類專業(yè)學(xué)生自學(xué)、便于開(kāi)展綜合性的設(shè)計(jì)和實(shí)驗(yàn)，有利于培養(yǎng)綜合分析能力、開(kāi)發(fā)和創(chuàng)新的能力。 multisim10.0激活碼及破解序列號(hào)
上傳時(shí)間： 2015-01-03
上傳用戶：daoyue
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