Hi Lina The current Thermal Shock test in the IPC-TM-650 has both electrical and microsection evaluation. The reason for this is the fact that electrical measuring techniques may or may not be adequate to "catch" the cracking going on within the barrel. Samples must meet the requirements of both evaluations to be considered compliant. Since your electrical test setup is not catching the cracking I would investigate the electrical wiring - the times at which measurements are made etc. The samples would not be compliant due to the barrel cracking found in the microsections. Susan Hott President Robisan Laboratory, Inc 6502 E 21st Street Indianapolis, IN 46219 317-353-6249 www.robisan.com --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts 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 -----------------------------------------------------