Dave, Are you saying we should drill holes into BGA balls in order to fine tune the xray machine? I have to admit I had never heard of a penetrometer and still find it a bit difficult to envision how we would use one to penetrate BGA voids. Phil -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of David D. Hillman Sent: Friday, January 13, 2012 5:25 AM To: [log in to unmask] Subject: Re: [TN] BGA X-ray baseline setting 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. 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