12P2532X152模塊,KJ3222X1-BA1中文PDF使用手冊(cè)
ICA內(nèi)部的可編程電源、繼電器和電子負(fù)載也不適合大電流測(cè)試。如果只是簡(jiǎn)單地?fù)Q成更大的電源，較高的電流可能會(huì)嚴(yán)重干擾到敏感的ICT測(cè)量的模擬量而導(dǎo)致誤差，包括接地反彈、線壓降以及感性負(fù)載在開(kāi)關(guān)瞬間產(chǎn)生的瞬變。使用專用FCT適配器進(jìn)行測(cè)量通常會(huì)有較低的分辨率和更大的濾波器，因此對(duì)于干擾并不敏感。另外，電源和繼電器觸點(diǎn)更堅(jiān)固耐用，因此能夠切換超過(guò)1安培的電流。
12P2532X152模塊,KJ3222X1-BA1中文PDF使用手冊(cè)第三，繼電器接口硬件和軟件控制一般是通過(guò)并行輸入輸出（PIO）控制器和繼電器驅(qū)動(dòng)器來(lái)更改繼電器配置（圖2）。繼電器的開(kāi)關(guān)速度在ICT應(yīng)用上通常不是問(wèn)題，因?yàn)槔^電器在每次DUT測(cè)試結(jié)束后會(huì)多路復(fù)用連接進(jìn)行重新配置，從一組引腳到下一組。如果是FCT測(cè)試適配器，每次測(cè)試時(shí)都要使用繼電器來(lái)更改每個(gè)DUT的功能測(cè)試設(shè)置，因此繼電器的控制數(shù)據(jù)吞吐量更高。在專用的FCT設(shè)置中，這不會(huì)造成問(wèn)題，因?yàn)橐淮蝺H檢查一個(gè)DUT，但是如果要以ICT/FCT適配器測(cè)試多個(gè)設(shè)備，那么中繼控制的速度限制會(huì)是一個(gè)瓶頸。最后，雖然ICT可以在幾毫秒內(nèi)完成測(cè)量，但FCT程序無(wú)法在設(shè)備通電時(shí)立即進(jìn)行測(cè)量，所以比ICT慢得多，因此在進(jìn)行測(cè)量之前必須先確定FCT程序有輸出，才能得到可靠的數(shù)據(jù)。通常，測(cè)量相同的產(chǎn)品，F(xiàn)CT程序所需的時(shí)間是ICT的五至十倍。如果將測(cè)試合并到一個(gè)ICT/FCT平臺(tái)中，F(xiàn)CT的部分可能會(huì)阻礙生產(chǎn)。如果將兩個(gè)程序分開(kāi)，那么一臺(tái)ICT儀器可以供給多個(gè)FCT測(cè)試臺(tái)以提高吞吐量并減少阻塞。
但是，對(duì)于RECOM Power新開(kāi)發(fā)的DC/DC產(chǎn)品系列來(lái)說(shuō)，兩個(gè)獨(dú)立測(cè)試適配器帶來(lái)的額外成本和測(cè)試時(shí)間是不被接受的，必須找到一種方法將ICT的速度優(yōu)勢(shì)與功能測(cè)試的100%質(zhì)量保證（全部集成在一個(gè)測(cè)試適配器）結(jié)合起來(lái)。這是一個(gè)復(fù)雜的技術(shù)挑戰(zhàn)：該產(chǎn)品系列涵蓋的器件具有高達(dá)6A輸出電流和60V輸入電壓。每個(gè)PCB板包含40個(gè)半成品模塊，這意味著需要使用強(qiáng)大耐用的電源進(jìn)行并行測(cè)試。因此數(shù)據(jù)吞吐量不僅很高，而且任何的定時(shí)錯(cuò)誤都可能成為問(wèn)題。RECOM與捷克的Elmatest簽訂了合同，共同為EMS供應(yīng)商使用的Teledyne Teststation LH建造一個(gè)ICT/FCT組合測(cè)試適配器。
Elmatest的應(yīng)用工程師Zdenek Martinek從一開(kāi)始就意識(shí)到這不是一個(gè)普通的項(xiàng)目。有幾個(gè)重要的問(wèn)題需要解決：如何將ICT/FCT組合到一個(gè)連板；如何處理如此高的繼電器控制數(shù)據(jù)吞吐量；如何加速FCT程序，以及如何在高功率下不傷害到敏感的探針。與RECOM研發(fā)部的Markus St?ger密切合作之后，他們找到了解決這些問(wèn)題的方法。
Therefore, for the leakage current required by medical equipment, the power module must meet the requirements as much as possible, and at the same time, the system ground design must be considered. It is best to leave a margin for leakage current. Contactable leakage current refers to the leakage current between the human body and the touchable point. Generally, the requirement is 100ua in normal state and 500uA in single fault state. Usually, the leakage current between MD module and ground, as well as the shell not protected by ground, etc. is measured during the test.
The ground leakage current refers to the current of the equipment to the ground, which is required to be 5mA, and 10mA in a single fault state.The above leakage current tests in the medical certification requirements mostly test the voltage under 110% of the rated network voltage, that is to say, it is not the definition of leakage current that we generally understand. Generally, the network voltage range of medical equipment is 100-250vac. According to the worst conditions, the test should be 265vac and 60Hz. Therefore, when the demand for medical power supply is put forward, we also need to pay attention to the test conditions of customers. On board electronics is mainly composed of TCMs system (network control system), signal system,
