It can easily be done with most modern X-rays, such as a Dage, Phoenix, or Yxlon. They automatically measure the ball diameter, and any voids seen are automatically measured as well, so you can set the parameters to reject any that are 25% of the ball diameter, or larger. Remember, the IPC specifications are 2D-based.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Chris Mahanna
Sent: Monday, January 16, 2012 11:54 AM
To: [log in to unmask]
Subject: Re: [TN] BGA X-ray baseline setting
It is probably a mistake to mix optical resolving power specification with x-ray.
I mean,.. you could, but good luck getting typical 40X optical resolving power out of an PBA x-ray!
Chris
Chris Mahanna
Robisan Lab
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of David D. Hillman
Sent: 2012/01/13 8:31 AM
To: [log in to unmask]
Subject: Re: [TN] BGA X-ray baseline setting
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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