描述
熱電偶測(cè)溫儀大都帶有冷端補(bǔ)償系統(tǒng),我們采用“直接尋找補(bǔ)償值”方法來(lái)消除補(bǔ)償導(dǎo)線引起的誤差。以性能穩(wěn)定的直流電壓發(fā)生器或熱電偶溫度校驗(yàn)儀作為源，以高精度數(shù)字多用表作為主標(biāo)準(zhǔn)器進(jìn)行監(jiān)測(cè)，從而對(duì)高精度熱電偶測(cè)溫儀進(jìn)行校準(zhǔn)。同時(shí)，對(duì)冷端補(bǔ)償進(jìn)行單獨(dú)的計(jì)量，更加準(zhǔn)確地校準(zhǔn)高精度熱電偶測(cè)溫儀。性能穩(wěn)定的直流電壓發(fā)生器或熱電偶溫度校驗(yàn)儀通過(guò)數(shù)字按鍵，輸入熱電偶測(cè)溫儀所需校準(zhǔn)溫度點(diǎn)熱電勢(shì)。該模擬熱電勢(shì)值由高精度數(shù)字多用表作為主標(biāo)準(zhǔn)器進(jìn)行監(jiān)測(cè)，以調(diào)節(jié)熱電偶溫度校驗(yàn)儀輸出熱電勢(shì);此時(shí)被校高精度熱電偶測(cè)溫儀再通過(guò)放大、濾波、A/D轉(zhuǎn)換采樣(或在A/D芯片進(jìn)行放大、濾波和A/D轉(zhuǎn)換采樣)獲取信號(hào)的數(shù)字信息，最后通過(guò)單片機(jī)(或嵌入式系統(tǒng))將采集所得數(shù)字信息通過(guò)軟件由于冷端補(bǔ)償法的使用點(diǎn)多面廣，與熱電偶配用的溫度二次儀表大都帶有冷端補(bǔ)償系統(tǒng)，對(duì)這類儀表的檢測(cè)是溫度二次儀表檢測(cè)的一個(gè)重要部分。參照J(rèn)JG617-1996《數(shù)字溫度指示調(diào)節(jié)儀》檢定規(guī)程的規(guī)定，對(duì)與熱電偶配用的數(shù)字溫度二次儀表的基本誤差的檢測(cè)，采用的方法是將被檢儀表連接補(bǔ)償導(dǎo)線插入冰點(diǎn)器，再用銅導(dǎo)線與信號(hào)源連接,輸入直流電壓信號(hào)來(lái)測(cè)量?jī)x表的誤差?？紤]到以下幾個(gè)方面:補(bǔ)償導(dǎo)線盡管有20℃時(shí)的修正值，其修正值本身的擴(kuò)展不確定度U=0.3℃(k=2);由于材料氧化、彎折而引起應(yīng)力變化等會(huì)帶來(lái)性能的漸變及熱電偶的不穩(wěn)定;溫度差異帶來(lái)的修正值的差異，冷端溫度并不一定是20℃，而修正值一律采用20℃時(shí)的修正數(shù)據(jù)，存在一定誤差。采用直接尋找補(bǔ)償值，來(lái)消除補(bǔ)償導(dǎo)線引入的誤差。
產(chǎn)品承諾：
保?證?全新原裝進(jìn)口,
保?證?安全準(zhǔn)時(shí)發(fā)貨，
保?證售后服務(wù)質(zhì)量，
優(yōu)勢(shì)價(jià)格，大量現(xiàn)貨。
主營(yíng)DCS系統(tǒng)配件
機(jī)器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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