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Dead weight testers are used for examination and calibration of pressure gauges and other pressure measuring instruments without using an external instrument. The main components are the measuring system, the valve units, the built-in screw pump for accurate pressure adjustment and the set of weights. The measuring system itself consists of a precise lapped-in pair of piston and cylinder. Dur
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設(shè)計(jì)了壓力開關(guān)參數(shù)測(cè)試系統(tǒng),能同時(shí)實(shí)現(xiàn)5個(gè)產(chǎn)品的觸點(diǎn)接觸電阻、絕緣電阻測(cè)試,動(dòng)作壓力和恢復(fù)壓力測(cè)試。系統(tǒng)采用虛擬儀器技術(shù),構(gòu)建了以工控計(jì)算機(jī)及其板卡為硬件平臺(tái),以LabVIEW為軟件平臺(tái)的虛擬儀器測(cè)試系統(tǒng)。采用四端鈕接法,實(shí)現(xiàn)了微電阻的測(cè)量,利用繼電器邏輯實(shí)現(xiàn)了5個(gè)產(chǎn)品多參量的自動(dòng)測(cè)試,并能根據(jù)測(cè)試結(jié)果自動(dòng)判別產(chǎn)品是否合格。結(jié)果表明,該系統(tǒng)運(yùn)行可靠,測(cè)試準(zhǔn)確度高,測(cè)試效率高。
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