An in - circuit tester tests a digital ic using the ic ' s truth table 在線測(cè)試設(shè)備采用真值表來(lái)測(cè)試數(shù)字集成電路。
The first test an in - circuit tester performs is a shorts - and - opens test 在線測(cè)試完成的第一項(xiàng)測(cè)試任務(wù)就是短路、開(kāi)路測(cè)試。
After performing the shorts and opens test , the in - circuit tester tests each component on a pcb assembly one at a time 在線測(cè)試完成的第一項(xiàng)測(cè)試任務(wù)就是短路、開(kāi)路測(cè)試。
After performing the shorts and opens test , the in - circuit tester tests each component on a pcb assembly one at a time 短路、開(kāi)路測(cè)試完成以后,在線測(cè)試儀需要在同一時(shí)間對(duì)印刷電路板上的每一個(gè)器件進(jìn)行測(cè)試。
These testers cost less than in - circuit testers , and some manufacturers claim that tests run faster on mdas 這些測(cè)試設(shè)備所需要的費(fèi)用要比在線測(cè)試設(shè)備少,而且有些制造商還宣稱在生產(chǎn)缺陷分析設(shè)備上,測(cè)試速度進(jìn)行的更快。
In - circuit testers can now also test for solder opens on surface - mounted devices ( smds ) , a common manufacturing defect on boards with smds 對(duì)于表面安裝設(shè)備來(lái)說(shuō),焊接開(kāi)路是一個(gè)很普遍的制造缺陷,在線測(cè)試設(shè)備可以將其測(cè)試出來(lái)。
For complex boards or boards that aren ' t tested with an in - circuit tester , most companies perform a functional test before final assembly 對(duì)于復(fù)雜的電路板或者沒(méi)有經(jīng)過(guò)在線測(cè)試的電路板而言,很多公司在最后裝配之前進(jìn)行功能測(cè)試。
Today , the test engineer has many more options , including in - circuit testers , manufacturing defects analyzers , and several types of functional testers 今天,測(cè)試工程師有很多選擇,包括在線測(cè)試設(shè)備,制造缺陷分析設(shè)備和一些功能測(cè)試設(shè)備。
Because in - circuit testers and mdas test components individually , a pcb assembly can pass an in - circuit or mda test and still not function properly 在線測(cè)試和生產(chǎn)故障發(fā)現(xiàn)測(cè)試都是對(duì)器件單獨(dú)進(jìn)行測(cè)試,一塊印刷電路板可以通過(guò)在線測(cè)試或生產(chǎn)缺陷測(cè)試,但是功能上還可能不是很完全。