美國國家儀器推出PXIexpress RF矢量信號發(fā)生器. 2007年9月17日消息，美國國家儀器宣布推出NI PXIe-5672,，一款RF矢量信號發(fā)生器，可提供頻率范圍為250 kHz 到2.7 GHz，瞬間寬帶為20赫茲，即時數(shù)據(jù)流可達25 MS/s。NI PXIe-5672同樣具備PXI　 Express的界面，使得從硬盤或PC存儲器中得到數(shù)據(jù)變成可能。NI PXIe-5672可與所有NI PXI相兼容，PXI Express模塊儀器和NI LabVIEW運算法則，使工程師很容易開發(fā)一個完整的基于RF記錄和重播系統(tǒng)的PXI,以及無線廣播和多用途通訊測試系統(tǒng)。 NI PXIe-5672的數(shù)據(jù)流可提供比傳統(tǒng)RF儀器更多的優(yōu)勢。傳統(tǒng)儀器對波形的產(chǎn)生和采集的信號通常都有限制，由于基帶和車載存儲有限。由于配有NI PXIe-5672模塊，PXI Express技術(shù)使工程師很容易就能利用獨立盤的冗余陣列來繼續(xù)流動波形，尺寸可達3TB。 利用NI PXIe-5672工程師們可以執(zhí)行RF記錄并回放。結(jié)合NIPXI-5661矢量信號分析儀和NI HDD-8264 RAID陣列，工程師們便能使RF基帶達到20MHZ的同時可以多使用5個小時。利用這一技術(shù)，工程師們能夠從許多種物理位置記錄RF信號，使捕捉信號成為可能。 關(guān)于PXI和組件儀器 PXI是由PXI系統(tǒng)聯(lián)盟（www.pxisa.org）控制的一個開放性規(guī)范，其定義了一個基于PC模塊儀器的平臺，用于優(yōu)化自動化測試、測量和控制。PXI成產(chǎn)于成立于1997年，已經(jīng)有70家會員公司和推出1500多種產(chǎn)品PXI規(guī)范產(chǎn)品。由于具備PXI模塊化儀器，工程師們可以從大范圍的測量、信號發(fā)生器、RF、功率和開關(guān)模塊中選擇，明確地指定他們所需要的功能。隨后，可以在軟件中配置儀器從而用于特殊測量任務(wù)。PXI和模塊化儀器通過利用工業(yè)標準PC的功率和高級的計時和同步技術(shù)提供高速的測試執(zhí)行。 關(guān)于美國國家儀器 NI（美國國家儀器有限公司，簡稱NI），將工程師和設(shè)計師們的方法轉(zhuǎn)換到測量，自動化和內(nèi)嵌式應(yīng)用中。NI為用戶提供現(xiàn)存軟件，如圖形開發(fā)環(huán)境NI LabVIEW與經(jīng)濟有效的模塊化硬件，這些產(chǎn)品向世界范圍內(nèi)25,000個不同的公司出售。NI總部設(shè)于美國德克薩斯州的奧斯汀，共擁有4300多名員工，在40多個國家擁有業(yè)務(wù)。在過去的八年中，《財富》雜志評選NI為全美最適合工作的100家公司之一。 [FONT=times] original text [/FONT] [font=times] National Instruments Introduces PXI Express RF Vector Signal Generator with 20 MHz Onboard Signal Processing [/font] [font=times][Color=#708090]Sept. 17, 2007 – National Instruments today announced the release of the NI PXIe-5672, an RF vector signal generator that delivers signal generation from 250 kHz to 2.7 GHz, 20 MHz of instantaneous bandwidth and real-time data streaming at up to 25 MS/s. The NI PXIe-5672 also features a PXI Express interface that makes it possible to stream data from hard disk or PC memory at the full output rate of the instrument. The NI PXIe-5672 is compatible with all NI PXI, PXI Express modular instruments and NI LabVIEW modulation algorithms, making it easy for engineers to develop a complete PXI-based RF record and playback system, as well as broadcast video and general-purpose communication test systems. The data streaming capability of the NI PXIe-5672 provides significant benefits over traditional RF instruments. On traditional instruments, waveform generation and acquisition sizes are generally limited to several hundred megabytes because of bus bandwidth and onboard memory limitations. With the NI PXIe-5672 module, PXI Express technology makes it easy for engineers to use redundant array of independent disks （RAID） arrays to continuously stream waveforms that are up to 3 TB in size. Using NI PXIe-5672, engineers can implement RF record and playback applications. Combined with the NI PXI-5661 vector signal analyzer and the NI HDD-8264 RAID array, engineers have the ability to stream up to 20 MHz of RF bandwidth for more than five hours. Using this technique, engineers can record RF signals from many types of physical locations and under a variety of environmental conditions, making it possible to capture signals that exhibit traditional wireless challenges including multipath fading, interference and fluctuations in signal strength. About PXI and Modular Instruments PXI is an open specification governed by the PXI Systems Alliance （www.pxisa.org） that defines a rugged, PC-based modular instrumentation platform optimized for automated test, measurement and control. Founded in 1997, the PXI specification is supported by more than 70 member companies and more than 1,500 products are available. With PXI modular instruments, engineers specify the essential functionality they require – choosing from a wide variety of measurement, signal generation, RF, power and switch modules. Then, they configure the instruments in software for their specific measurement tasks. PXI and modular instruments provide high-speed test execution by harnessing the power of industry-standard PC and advanced timing and synchronization technologies. About National Instruments National Instruments （www.ni.com） is transforming the way engineers and scientists design, prototype and deploy systems for measurement, automation and embedded applications. NI empowers customers with off-the-shelf software such as NI LabVIEW and modular cost-effective hardware and sells to a broad base of more than 25,000 different companies worldwide, with no one customer representing more than 3 percent of revenue and no one industry representing more than 10 percent of revenue. Headquartered in Austin, Texas, NI has more than 4,300 employees and direct operations in nearly 40 countries. For the past eight years, FORTUNE magazine has named NI one of the 100 best companies to work for in America.[/color][/font]