Hi Ahmet, IPC LF Listservers, The older Book IPC-TM-650 apparently a free download at: http://www.ipc.org/contentpage.asp?PageID=4.1.0.1 is available as one IPC source to get you started on understanding many printed circuit board type test methods. pull, peel, shear, twist. As you internet poke around at the IPC Standards Section of ipc.org site http://www.ipc.org/contentpage.asp?Pageid=4.1 You should most likely find your answer. Yours in Engineering, Dave YiEngr, MA/NY DDave -------------------------------------------------------------------------------Leadfee Mail List provided as a service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Leadfree To temporarily stop/(start) delivery of Leadree for vacation breaks send: SET Leadfree NOMAIL/(MAIL) Search previous postings at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -------------------------------------------------------------------------------