You will have a "Fish-eye" effect with a lot of x-ray machines. Meaning that when you are viewing the whole image, the image of the balls in the center of the screen will appear to be a different diameter than the balls at the edges of the screen. You should only concentrate on what you see at the center of the screen, and manipulate and move the BGA around so that you can see all the balls in the center of the screen. Steve ----- Original Message ----- From: "Paul Edwards" <[log in to unmask]> To: <[log in to unmask]> Sent: Friday, January 22, 2010 8:59 PM Subject: Re: [TN] X-Ray Inspection Are you x-raying a BGA with a metal lid? Paul Paul Edwards Surface Art Engineering -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Ashok Dhawan Sent: Friday, January 22, 2010 11:22 AM To: [log in to unmask] Subject: Re: [TN] X-Ray Inspection Bob We are currently doing XRAY Inspection of BGAs. The XRAY TestEngineer noticed that solder ball size on outer rows is different from the ball size on inner core areas. "We are still seeing a bi-modal data distribution of ball volume between the middle and periphery balls? Is that normal for BGAs. " I would appreciate your expert comments as there is not much XRAY related information on web. Regards Ashok Dhawan Manuf. Specialist Parker hannifin Electronic Controls Winnipeg Canada [log in to unmask] --------------------------------------------------- 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 email and any attachments thereto may contain private, confidential, and privileged material for the sole use of the intended recipient. Any review, copying, or distribution of this email (or any attachments thereto) by others is strictly prohibited. If you are not the intended recipient, please contact [log in to unmask] immediately and permanently delete the original and any copies of this email and any attachments thereto. ============================================================================= --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 -----------------------------------------------------