This paper first begin with the connotation of virtual instrument technology, study and discuss the criterion and the working theory of usb deeply. on the principle of usb1. 1criterion, using usb interface chip usbn9604 and low consumption mirochip c8051f231, we designed the available interface of usb bus and its controlling software, turn the communicating function based usb bus between computer and testing device. second based on the developed interface of usb bus, using microchip pic16c62 and a mount of relays, we designed the multiswitching scanner and its controlling software to complete the funtion of accesses swithing in testing system. third calling the api function inside the windows using vb programming language, communicat with the impelling program of selected hid, achieve the function of testing instrument with usb interface, complete the development of upside software faced testing. at last, based on the deep studying of pcb testing method, used the developed multiswithing scanner and software faced testing, combinated with necessary testing instrument, we constructed the pcb testing system and analized the testing result simply
論文首先從虛擬儀器的技術內涵出發,深入研究和討論了通用串列總線usb規范及工作原理,並依據usb1 . 1規范,採用usb介面晶元usbn9604和低功耗微處理器c8051f231設計開發了通用的usb總線介面及其控制固件,實現了通用計算機與測試設備之間基於usb總線的通信功能;其次,在所開發的usb總線介面的基礎上,使用微處理器pic16c62和多路繼電器開關,設計開發出實現測試系統中測試通道切換功能的多路通道
掃描器及其控制固件;再次,採用vb語言編程,調用windows內部api函數,與選定hid類驅動程序進行通信,實現usb總線介面測試儀器功能,完成面向測試的上層軟體開發;最後,在深入研究印
刷電路板測試方法的基礎上,利用已開發的多路通道
掃描器和面向測試軟體,結合必要測試儀器組建印
刷電路板測試系統,並對測試結果進行了簡要的誤差分析。
Editing and typesetting, typing - in and image scanning, along with text graphic handling using pdf, pagemaker, framemaker, freehand, illustrator, acrobat, acrobat reader, coreldraw and other software and concerned printing and binding services. contact us for details
編輯排版錄入和圖像
掃描,並提供pdf pagemaker framemaker freehand illustrator acrobat acrobat reader coreldraw等軟體做文字圖表處理及相關的印
刷裝訂服務,詳情請垂詢本公司。
Artisans in 11 craft shops demonstrate trades of that period : glassblowing, pottery making, spinning and weaving, broom making, woodworking, basket making, printing, and quilting
11間工藝品店的工匠會示範當時的行業:玻璃吹制、制陶、紡織及編織、製作
掃帚、木工工藝、製作籃子、印
刷及縫制棉被。
Our main products : dust mop, wet mop, pva mop, drying mop, microfibre mop, sweeper, wool duster, ostrich duster, turkey duster, electrostatic duster, lint brush, sticky roller, car brush, pet hair pic - up lint mitt, broom, dustpan, toilet brush, windows wiper, magic sponge, cleaning slippers etc
公司主要產品有:家用和商用塵推、水拖把、膠棉拖把;地板擦;超細纖維系列家用拖把;汽車清潔系列、汽車
刷;玻璃刮、羊毛撣、靜電撣;
掃帚、吸塵埃(打蠟)劑;商用(家用)畚箕;衣
刷、衛生清潔用
刷;園藝用品等。
We that one a of specialities produce little electrical home appliances the enterprises of productses, locate in and enjoy " mould of china city ", the yuyao of zhejiang of titles of " plastic of china city " ; from 60 kilometers of ports in ningbo, exports 5 kilometers from high speed yuyao of turtledove of hangzhou of shanghai, geographical environment is superior, complete auxiliary facility, produce electric sweeper, electric toothbrush, steam cleaner, car refrigerator, popcorn maker, etc
我司地處享有「中國塑料城」 「中國模具城」之稱的浙江餘姚,距寧波港口60km ,離滬杭甬高速餘姚出口5km ,地理環境優越,配套設施完備。是一家集研發生產出口於一體的小家電系列產品的專業廠家,主要生產電動
掃地機電動牙
刷蒸汽清潔器爆米花機汽車冰箱等,產品通過tuv gs ce認證,質量第一,交貨及時,竭誠歡迎國內外客商與我們聯系,共同建立業務合作關系。
Brooms, brushes, paint - brushes ; designation of filling materials
掃帚
刷子漆
刷.填充材料的名稱
Roller brushes for machines for road surface cleaning and highway maintenance machines - dimensions
路面清
掃設備和公路養護設備用滾筒路
刷.尺寸
Aunt harriet presided over an invisible army of servants that continuously scrubbed, cleaned, and published.
姑母哈麗特支配著一大群看不見的僕人,他們不停地
刷洗、打
掃和擦拭。
Standard test method for size - differentiated counting of particles and fibers released from clean room wipers using optical and scanning electron microscopy
利用光電子顯微鏡和
掃描電子顯微鏡對清潔室擦
刷工具釋放粒子和纖維的尺寸差異計數的標準試驗方法
An optional coating spray system is available
另可選配噴霧系統和清
掃刷系統。
Her house was always all scrubbed out and cleaned on saturday ; neither she nor her servants did any work, and every one wore holiday - dress and went to service
禮拜六她的住宅就清掃刷洗得乾乾凈凈,家僕們和她在這天都不工作,大家穿著節日的服裝去作日禱。