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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)計了壓力開關(guān)參數(shù)測試系統(tǒng),能同時實現(xiàn)5個產(chǎn)品的觸點接觸電阻、絕緣電阻測試,動作壓力和恢復(fù)壓力測試。系統(tǒng)采用虛擬儀器技術(shù),構(gòu)建了以工控計算機及其板卡為硬件平臺,以LabVIEW為軟件平臺的虛擬儀器測試系統(tǒng)。采用四端鈕接法,實現(xiàn)了微電阻的測量,利用繼電器邏輯實現(xiàn)了5個產(chǎn)品多參量的自動測試,并能根據(jù)測試結(jié)果自動判別產(chǎn)品是否合格。結(jié)果表明,該系統(tǒng)運行可靠,測試準(zhǔn)確度高,測試效率高。