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April 2008

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Subject:
From:
"Bernard, David" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Bernard, David
Date:
Tue, 15 Apr 2008 12:17:23 +0100
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Hi Joe,

The propensity for voltage blooming will be dependent on the capability
of the x-ray system being used and in particular the sensitivity of the
image detection it has. Therefore, one system might have a problem and
another not, at the same x-ray tube settings. I understand that these
are issues that are being addressed in discussions for the revision to
the IPC 7095A document and the production of the IEC document looking at
the same issue. 

Overall, I would suggest that the best approach is to ensure consistency
on your measurements with the x-ray system you have such that even if
blooming is taking place then your data set over time remains as
consistent as possible.

David

Dr. David Bernard 
Product Manager X-ray Systems 
Dage Precision Industries 
E-mail: [log in to unmask] 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Joe Macko
Sent: 14 April 2008 20:46
Subject: Guidelines for setting voltage and current when viewing BGA
x-rays

All,

 

Properly setting the voltage and current values on an x-ray machine seem
to be critical in correctly viewing BGA solder connections. To high or
to low will distort the x-ray image. I know that to high of a voltage
results in a phenomenon know as "voltage blooming".

 

I am looking for some general guidelines on setting a x-ray machine
voltage and current when viewing BGA solder connections so a potential
void can be correctly determined, measured, etc..  Thanks all.

 

best regards,

-joe

 

 


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