采購人員試驗機選型選擇要點(diǎn)
發(fā)布時(shí)間:2018-11-23 來(lái)源:濟南恒思盛大儀器有限公司 瀏覽:次
一、選擇分辨率和動(dòng)態(tài)性能
A, select the resolution and dynamic performance
分辨率是試驗機的一個(gè)重要參數,合適的分辨率將有利于測量的解析度,測量出較小的分度,有效分辨率和動(dòng)態(tài)性能是一對矛盾,一味的提高有效分辨率是以犧牲動(dòng)態(tài)性能(帶寬)為代價(jià)的,帶寬的降低直接導致的結果是材料屈服波動(dòng)不明顯甚至出現屈服就是一個(gè)平臺的現象,所以在選型是也要對這對參數進(jìn)行有效的考慮;
Resolution is an important parameter of test machine, the appropriate resolution will be conducive to the measurement resolution, measuring a smaller degree, the effectiveresolution and dynamic performance are a pair of contradictions, improve the effectiveresolution blindly at the expense of dynamic performance (bandwidth) is cost, bandwidthreduction results as a direct result of the material the yield fluctuation is not obvious or evenyield is a platform phenomenon, so the selection is also effective to consider the parameters;
二、選擇精度等級
Two, choose the precision grade
目前國內試驗機的精度普遍使用1級和0.5級兩種,對于一般的材料試驗選擇1級的試驗機完全足夠,沒(méi)有必要多花錢(qián)提高精度,對于科學(xué)研究和材料分析就需要0.5級精度的試驗機;其實(shí)對于0.5級和1級精度的試驗機在技術(shù)上差別并不明顯,校驗的方法和手段基本是一樣的,這是修正點(diǎn)的不一樣上,隨著(zhù)傳感器技術(shù)的發(fā)展,傳感器元件的線(xiàn)性度已經(jīng)達到一個(gè)很高的水準,只要測量電路沒(méi)有缺陷,抗干擾性能好的話(huà),所有的試驗機都會(huì )達到0.5級的精度是沒(méi)有問(wèn)題的;
At present domestic testing machine accuracy generally use 1 level and 0.5 level two, formaterials testing general choice test machine level 1 enough, there is no need to spend more money to improve accuracy, testing machine for analysis of scientific research and material needs 0.5 level accuracy; in fact for testing machine 0.5 level and 1 level precisionin the technology is not significantly different, methods and means of verification is basically the same, this is fixed point is not the same, along with the development of sensor technology, sensor linearity has reached a very high level, as long as the measurementcircuit has no defect, anti-jamming performance is good, all test machine will reach 0.5 level accuracy is no problem;
三、選擇量程
Three, select the range
根據試驗材料的載荷選擇所需要的試驗機載荷(即量程),推薦材料試驗載荷在試驗機量程的70%――90%左右為佳,這樣既保證了試驗的分辨率也可以延長(cháng)試驗機的使用壽命;
The maximum load testing machine according to the maximum load test materials needed (Ji Liangcheng), the recommended material test load on the test machine range 70% -- 90% for good, this can not only ensure the test resolution can also extend the service life of themachine;
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