Hi Wee Mei - one method of characterizing and setting a X-ray baseline is to purchase a penetrometer or make one with specific drilled holes sizes. The most of the standard industry penetrometers don't have holes sizes that correspond with the voids sizes we are concern about in electronics but you can modify one fairly easily to fit the bill. Good Luck. Dave Hillman Rockwell Collins [log in to unmask] Lum Wee Mei <[log in to unmask]> Sent by: TechNet <[log in to unmask]> 01/13/2012 01:29 AM Please respond to TechNet E-Mail Forum <[log in to unmask]>; Please respond to Lum Wee Mei <[log in to unmask]> To <[log in to unmask]> cc Subject [TN] BGA X-ray baseline setting Dear TechNet Buddies, In IPC-A-600, the standard provides states the inspection magnification requirement. For external observation : at 1.75x and progress to 40x if acceptable condition of a suspected defect is not apparent. Such inspection magnification requirement is not given in IPC-7095 for BGA x-ray. What is the common industry practice on : (a) Tube voltage (b) Tube power (c) Filter strength (d) Averaging I asked because I worry that I may unintentional set a 'wrong' tube voltage that could result in the effect known as "Voltage Blooming'. I do not want to cause false alarm due to my incompetency and result in wrong inspection judgment on the void size. Thanks and regards, ~wee mei~ ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 16.0 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 For additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 16.0 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 For additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------