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January 2012

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Subject:
From:
"David D. Hillman" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Fri, 13 Jan 2012 07:30:38 -0600
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Hi Wee Mei - one mistake in my last email - the X-ray gauge is a
Penetrameter and not a penetrometer.

Dave



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~


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