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href="http://www.cdcfah.com/cp/first-_yiqiyibiao/">儀器儀表</a>?<a href="http://www.cdcfah.com/cp/second-yiqiyibiao_gxyq/">光學(xué)儀器</a>?<a href="http://www.cdcfah.com/cp/third-gxyq_gpygdj/">光譜儀、光度計(jì)</a>?中國(guó)**紫外可見(jiàn)分光光度計(jì)賣價(jià) 歡迎來(lái)電上海儀電分析儀器供應(yīng)</p><div id="5z7hlm3" class="leftbox clearfix"><h1>中國(guó)**紫外可見(jiàn)分光光度計(jì)賣價(jià) 歡迎來(lái)電上海儀電分析儀器供應(yīng)</h1><div id="f3uv8p8" class="proBig"><div id="cgmdzaz" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593139440396/4585287.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="vsj83zs" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593139440396/4585287.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="3lu8lkq" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價(jià)格要求：</span>面議</p><p><span>所在地：</span>上海市</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關(guān)鍵詞：</span>中國(guó)**紫外可見(jiàn)分光光度計(jì)賣價(jià),紫外可見(jiàn)分光光度計(jì)</p><p><span>***更新：</span>2020-11-08 07:20:51</p><p><span id="click" >瀏覽次數(shù)：0次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="3xy8ie2" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">上海儀電分析儀器有限公司</a></p><p><span>聯(lián)系人：</span>薛馬駿</p><p><span>郵箱: </span>ydfxwx@qq.com</p><p><span>電話: </span>18001994173</p><p><span>傳真: </span>021_</p><p><span>網(wǎng)址: </span>http://www.inesa-a.com</p><p><span>手機(jī): </span>021-34530361</p><p><span>地址: </span>徐塘路88號(hào)7幢4層、9幢</p><p>[當(dāng)前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="oklnofr" class="page-proshow02"><p class="title">詳細(xì)說(shuō)明</p><div id="z3v7fwd" class="box"><p><p> 雜散光：典型值是0.01～0.05%T，中國(guó)**紫外可見(jiàn)分光光度計(jì)賣價(jià)，在國(guó)外的產(chǎn)品中有65種產(chǎn)品的雜散光指標(biāo)在這一范圍中。雜散光超過(guò)0.05%T的產(chǎn)品有31種，小于0.01%T的產(chǎn)品有19種。。從其光學(xué)設(shè)計(jì)看，都采用了雙單色器。與掃描光柵型產(chǎn)品相比，固定光柵的分光光度計(jì)少了出射狹縫，實(shí)現(xiàn)低雜散光的難度更大。從性能指標(biāo)來(lái)看，范圍是0.01～1%T。26種固定光柵型產(chǎn)品中雜散光在0.01～0.05%T之間的有13種，也已達(dá)到半數(shù)，中國(guó)**紫外可見(jiàn)分光光度計(jì)賣價(jià)，但是能夠低于0，中國(guó)**紫外可見(jiàn)分光光度計(jì)賣價(jià).01%T的很少。波長(zhǎng)準(zhǔn)確性，國(guó)外的典型水平是0.1～1nm。國(guó)內(nèi)產(chǎn)品中，處于此范圍的有16種，基本達(dá)到同一水平，但沒(méi)有優(yōu)于0.1nm的產(chǎn)品。國(guó)內(nèi)產(chǎn)品的光度準(zhǔn)確性大多以透過(guò)率表示，水平比較接近，均在0.3～0.5%T之間。在10%T處，也就是吸光度為1A處，將光度準(zhǔn)確性以吸光度表示，則數(shù)值為0.013～0.021A。與國(guó)外產(chǎn)品有比較明顯的差距。國(guó)內(nèi)產(chǎn)品的光度重復(fù)性基本在0.1～0.3%T范圍，同樣在吸光度1A處換算，數(shù)值為0.004～0.013A，也存在距離。比較國(guó)外與國(guó)內(nèi)產(chǎn)品的雜散光的典型值，兩者幾乎相差了一個(gè)數(shù)量級(jí)。但是已有一些較新研發(fā)的產(chǎn)品，可以達(dá)到國(guó)外產(chǎn)品的普遍水準(zhǔn)。紫外分光光度計(jì)（UV Spectrophotometer）在實(shí)驗(yàn)室長(zhǎng)期在分析領(lǐng)域扮演很重要的角色。中國(guó)**紫外可見(jiàn)分光光度計(jì)賣價(jià)</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="中國(guó)**紫外可見(jiàn)分光光度計(jì)賣價(jià),紫外可見(jiàn)分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593139440396/4585287.png"></div><p> 使用紫外分光光度計(jì)的過(guò)程中，經(jīng)常會(huì)遇到儀器因光源達(dá)不到要求，需要進(jìn)行調(diào)修。要求光源燈處不能有空氣流動(dòng)，因?yàn)閱喂馐鴥x器很忌諱空氣快速流動(dòng)而使光源燈的色溫發(fā)生變化。如遇電壓正常而鎢燈不亮?xí)r，就需要更換鎢燈。更換時(shí)，不要用手直接接觸燈泡表面，如果手指摸過(guò)，應(yīng)用無(wú)水乙醇和C4H10O混合液擦拭干凈，否則通電后指印遇熱不能去除。安裝光源燈后要注意調(diào)整光路。光源燈有兩個(gè)引線頭，安裝時(shí)用導(dǎo)線焊接，主要是防止接觸不良而造成的光源發(fā)光不穩(wěn)現(xiàn)象。在焊接時(shí)防止焊點(diǎn)與燈頭銅皮碰上，裝上燈座使電源短路。燈絲要求平直，如果燈絲彎曲，會(huì)影響光能量。燈絲的位置要與入射狹縫平行并對(duì)準(zhǔn)，上、下、左、右調(diào)節(jié)后緊固螺釘。擰緊燈座的螺紋套，可用鉗子擰緊，一般燈頭盡量往燈座里塞，因?yàn)槎鄶?shù)燈絲離燈頭偏高。調(diào)整燈位置的前后可移動(dòng)整個(gè)燈座架，它下面有三個(gè)固定螺釘，先稍松后，移動(dòng)前后位置再固定。一般調(diào)節(jié)鎢燈的位置時(shí)，將波長(zhǎng)調(diào)到580nm處，狹縫調(diào)到MAX，把一張白紙置于比色皿盒邊出口處，觀察白紙上的光斑。若光斑上方左右角均不完整成半圓弧，可能是光源燈高度不對(duì)；光斑左邊或右邊不完整，可調(diào)光源燈底座位置。調(diào)整至白紙上可見(jiàn)明亮、均勻的長(zhǎng)方形黃橙色光斑。環(huán)境檢測(cè)紫外可見(jiàn)分光光度計(jì)儀器光學(xué)構(gòu)造和光源、探測(cè)方法、樣品類型和數(shù)據(jù)處理等都是要考慮的因素。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="中國(guó)**紫外可見(jiàn)分光光度計(jì)賣價(jià),紫外可見(jiàn)分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594849245086/5585171.png"></div>紫外可見(jiàn)分光光度計(jì)的基本結(jié)構(gòu) <p> 紫外可見(jiàn)分光光度計(jì)的工作原理是由光源發(fā)出連續(xù)輻射光，經(jīng)單色器按波長(zhǎng)大小色散為單色光，單色光照射到吸收池，一部分被樣品溶液吸收，未被吸收的光經(jīng)檢測(cè)器的光電管將光強(qiáng)度變化轉(zhuǎn)變?yōu)殡娦盘?hào)變化，并經(jīng)信號(hào)顯示系統(tǒng)調(diào)制放大后，顯示或打印出吸光度A（或透射比T），完成測(cè)定。 </p> <p> 一、光源 </p> <p> 光源是提供符合要求的入射光的裝置，紫外可見(jiàn)分光光度計(jì)可見(jiàn)光區(qū)常用的光源為鎢燈，紫外光區(qū)常用的光源為氫燈或氘燈。 </p> <p> 1.1．鎢燈 </p> <p> 鎢燈是常用的可見(jiàn)光光源，它可發(fā)射的波長(zhǎng)為325~2500nm的連續(xù)光譜，其中適宜的使用波長(zhǎng)范圍為320~1000nm，因此，也可用做近紅外光源。電能將鎢燈加熱到白熾時(shí)，發(fā)出的光強(qiáng)度在各波段的分布隨燈絲溫度而變化。燈絲的溫度取決于電源電壓。電源電壓的微小波動(dòng)都會(huì)引起鎢光強(qiáng)度的很大變化。因此必須使用穩(wěn)壓電源供電，鎢燈工作電壓為12V，也可以使用12V的直流電源供電。鎢燈的壽命一般可達(dá)10000小時(shí)以上。 </p> <p> 目前很多光度計(jì)采用鹵鎢燈代替鎢燈，如7230G型、752PLUS型分光光度計(jì)等。鹵鎢燈具有較高的發(fā)光效率和較長(zhǎng)的使用壽命。 </p><p> 常見(jiàn)的可見(jiàn)分光光度計(jì)和紫外可見(jiàn)分光光度計(jì)的型號(hào)有哪些? </p> <p> 可見(jiàn)分光光度計(jì)常見(jiàn)的有721系列，722系列和723系列。721系列可見(jiàn)分光光度計(jì)有721/721-100型，測(cè)定波長(zhǎng)為360-800nm，分為分指針和數(shù)顯式兩種方式的顯示器。其中721-100型相對(duì)于721是型將測(cè)試樣品室加寬，可用10cm的比色皿，為糖廠**檢測(cè)儀器。722系列可見(jiàn)分光光度計(jì)有722/722S/722N型，測(cè)定波長(zhǎng)為330-1000nm/325-1000nm。722型波長(zhǎng)是330-1000nm，722S與722N的波長(zhǎng)范圍325-1000nm，其中722N是自動(dòng)調(diào)節(jié)波長(zhǎng)。723系列可見(jiàn)分光光度計(jì)有723/723N/723PC/723PCS型四種，測(cè)定波長(zhǎng)為320-1000nm，其中723是手動(dòng)調(diào)整波長(zhǎng)，723N是自動(dòng)調(diào)波長(zhǎng)，723PC配有掃描軟件，723PCS帶有掃描軟件和打印機(jī)。紫外可見(jiàn)分光光度計(jì)常見(jiàn)的是UV752/UV752N，波長(zhǎng)范圍是195nm-1020nm。二者<span style="display:none;"></span>主要區(qū)別是UV752N可以選配打印機(jī)將數(shù)據(jù)輸出，其中在雜散光參數(shù)，光譜帶寬等方面還有細(xì)微的差別。初次使用紫外可見(jiàn)分光光度計(jì)的人員，一般來(lái)說(shuō)，一定要詳細(xì)閱讀儀器安全操作手冊(cè)。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="中國(guó)**紫外可見(jiàn)分光光度計(jì)賣價(jià),紫外可見(jiàn)分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396592216930546/1658567.png"></div><p> 使用紫外可見(jiàn)分光光度計(jì)時(shí)需要注意哪些方面？ </p> <p> 1、使用的吸收池必須潔凈，并注意配對(duì)使用。量瓶、移液吸管均應(yīng)校正、洗凈后使用。 </p> <p> 2、取吸收池時(shí)，手指應(yīng)拿毛玻璃面的兩側(cè)，裝盛樣品以池體的4/5為度，使用揮發(fā)性溶液時(shí)應(yīng)加蓋，透光面要用擦鏡紙由上而下擦拭干凈，檢視應(yīng)無(wú)溶劑殘留。吸收池放入樣品室時(shí)應(yīng)注意方向相同。用后用溶劑或水沖洗干凈，晾干防塵保存。 </p> <p> 3、供試品溶液濃度除各該品種已有注明外，其吸收度以在0.3～0.7之間為宜。 </p> <p> 4、測(cè)定時(shí)除另有規(guī)定外，應(yīng)以配制供試品溶液的同批溶劑為空白對(duì)照，采用1cm石英吸收池，在規(guī)定的吸收峰±2nm以內(nèi)，測(cè)幾個(gè)點(diǎn)的吸收度或由儀器在規(guī)定的波長(zhǎng)附近自動(dòng)掃描測(cè)定，以核對(duì)供試品的吸收峰位置是否正確，并以吸收度MAX的波長(zhǎng)作為測(cè)定波長(zhǎng)，除另有規(guī)定外吸收度MAX波長(zhǎng)應(yīng)在該品種項(xiàng)下規(guī)定的測(cè)定波長(zhǎng)±2nm以內(nèi)。 </p> <p> 5、供試品應(yīng)取2份，如為對(duì)照品比較法，對(duì)照品一般也應(yīng)取2份。平行操作，每份結(jié)果對(duì)平均值的偏差應(yīng)在±0.5%以內(nèi)。 </p> <p> 6、選用儀器的狹縫寬度應(yīng)小于供試品吸收帶的半寬度，否則測(cè)得的吸收度值會(huì)偏低，狹縫寬度的選擇應(yīng)以減少狹縫寬度時(shí)供試品的吸收度不再增加為準(zhǔn)，對(duì)于大部分被測(cè)品種，可以使用2nm縫寬。<span style="display:none;"></span> 紫外分光光度計(jì)的光柵是一系列等寬、等距離的平行狹縫，以光的衍射現(xiàn)象和干涉現(xiàn)象為基礎(chǔ)。環(huán)保紫外可見(jiàn)分光光度計(jì)單價(jià)</p><p style="text-indent:25px">分光光度計(jì)的氘燈和汞燈是在不同波長(zhǎng)的時(shí)候有程序控制自動(dòng)變換的，一般是在360nm處變換。中國(guó)**紫外可見(jiàn)分光光度計(jì)賣價(jià)</p><p> 分光光度計(jì)的帶寬（bandwidth）很大程度上依賴于單色儀的狹縫的寬度?？梢酝渡涑鰧?shí)驗(yàn)精確要求的光譜。一種嚴(yán)格帶寬使得儀器能對(duì)復(fù)雜的混合物進(jìn)行高分辨率的吸光測(cè)量?？勺兊膯紊珒x的狹縫寬度能使一臺(tái)分光光度計(jì)滿足多種實(shí)驗(yàn)需要。 </p> <p> 為了測(cè)量吸光值，分光光度計(jì)制造商通常使用光電倍增管（photo-multipliertubes，PMTs）和光敏二極管。PMTs提供快速的反應(yīng)時(shí)間和良好的靈敏度，并且可以在紫外光譜調(diào)節(jié)至特定的范圍。但一些制造商依賴于光敏二極管的動(dòng)態(tài)范圍在數(shù)秒內(nèi)行使所有的光譜測(cè)量。中國(guó)**紫外可見(jiàn)分光光度計(jì)賣價(jià)</p><p style="text-indent:25px">上海儀電分析儀器有限公司辦公設(shè)施齊全，辦公環(huán)境優(yōu)越，為員工打造良好的辦公環(huán)境。專業(yè)的團(tuán)隊(duì)大多數(shù)員工都有多年工作經(jīng)驗(yàn)，熟悉行業(yè)專業(yè)知識(shí)技能，致力于發(fā)展儀電分析,上分的品牌。我公司擁有強(qiáng)大的技術(shù)實(shí)力，多年來(lái)一直專注于儀器儀表、電子元器件及相關(guān)的系統(tǒng)集成的生產(chǎn)、服務(wù)及銷售，計(jì)算機(jī)軟件開(kāi)發(fā)及銷售，從事貨物進(jìn)出口及技術(shù)進(jìn)出口業(yè)務(wù)?！疽婪毥?jīng)批準(zhǔn)的項(xiàng)目，經(jīng)相關(guān)部門(mén)批準(zhǔn)后方可開(kāi)展經(jīng)營(yíng)活動(dòng)】?jī)x器儀表、電子元器件及相關(guān)的系統(tǒng)集成的生產(chǎn)、服務(wù)及銷售，計(jì)算機(jī)軟件開(kāi)發(fā)及銷售，從事貨物進(jìn)出口及技術(shù)進(jìn)出口業(yè)務(wù)。【依法須經(jīng)批準(zhǔn)的項(xiàng)目，經(jīng)相關(guān)部門(mén)批準(zhǔn)后方可開(kāi)展經(jīng)營(yíng)活動(dòng)】的發(fā)展和創(chuàng)新，打造高指標(biāo)產(chǎn)品和服務(wù)。儀電分析始終以質(zhì)量為發(fā)展，把顧客的滿意作為公司發(fā)展的動(dòng)力，致力于為顧客帶來(lái)***的分光光度計(jì)，氣相色譜，原子吸收，食品安全。</p></p><br /><p>文章來(lái)源地址: http://www.cdcfah.com/cp/1900720.html</p></div></div></div></div></div><div id="83cg8kl" class="page-right twoColRt"><div id="a3x8cdj" class="box01 margin10 clearfix"><h3><a 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