Class Test XXX 85+ 2 °C 85 + 2 °C Test Humidity XXX 测试电压应为直流电压(VDC),测试图应符合IPC-B-25A标准,持续时间应为500小时,要求电阻下降小于1个数量级,电阻应大于2兆欧。对于H级应用,应根据IPC-TM-650中2.6.7.3的条件,按照表3-5中规定的热冲击条件进行测试,测试样品应符合3.3的要求。在进行...
For all practicalpurposes there is no Class 1 solder mask.Class 2 is equivalent to Class T (Telecommunications).Class 3 isthe equivalent of Class H (Military/high reliability).Solder mask materials covered in the standard are notintended for use as a substitute for conformal coatings thatare ...
840C,January1996,Class‘‘T’’requirementsshallbe acceptable.TherequirementscontainedintheIPCdocu- mentaresimilarorequivalenttotheonescontained herein.’’ 1.3Classes Addthefollowingparagraphattheendofsection: Note:Soldermasktypeswerepreviouslydescribedas TypeAforscreenimaged(liquid)orcoverlayforflex (dry),and...