Hi Joe, The propensity for voltage blooming will be dependent on the capability of the x-ray system being used and in particular the sensitivity of the image detection it has. Therefore, one system might have a problem and another not, at the same x-ray tube settings. I understand that these are issues that are being addressed in discussions for the revision to the IPC 7095A document and the production of the IEC document looking at the same issue. Overall, I would suggest that the best approach is to ensure consistency on your measurements with the x-ray system you have such that even if blooming is taking place then your data set over time remains as consistent as possible. David Dr. David Bernard Product Manager X-ray Systems Dage Precision Industries E-mail: [log in to unmask] -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Joe Macko Sent: 14 April 2008 20:46 Subject: Guidelines for setting voltage and current when viewing BGA x-rays All, Properly setting the voltage and current values on an x-ray machine seem to be critical in correctly viewing BGA solder connections. To high or to low will distort the x-ray image. I know that to high of a voltage results in a phenomenon know as "voltage blooming". I am looking for some general guidelines on setting a x-ray machine voltage and current when viewing BGA solder connections so a potential void can be correctly determined, measured, etc.. Thanks all. best regards, -joe --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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 ----------------------------------------------------- **** This e-mail message, including any attachment(s), is intended solely for the addressee or addressees and is strictly confidential or otherwise legally protected. Any views or opinions presented herein are solely those of the author and do not necessarily represent those of Dage Holdings Ltd. If you are not the intended recipient of this communication please return this e-mail message and the attachment(s) to the sender and delete and destroy all copies. Dage Holdings Ltd is not liable for any viruses contained in this e-mail message and/or in the attachment(s). Dage Holdings Ltd cannot be held responsible or liable in any way whatsoever for and/or in connection with any consequences and/or damage resulting from the improper, incomplete and untimely dispatch and receipt of the content of this e-mail. **** --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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 -----------------------------------------------------