Alan,

I guess these ball bearings helped you to test image quality of tested 
equipment and calibrate the Xray equipment to define size of BGA balls 
and other things.

But do you thing metal balls can be used as precise calibration for 
measurement of voids inside BGA balls?
I mean voids are lack of material and balls are presence of material 
(metal).
In other way, does the equipment setups for correct observation of ball 
bearings is really the same for the voids observation and size measurement?

Thanks in advance for your input.
Fabrice

Alan Kreplick a écrit :
> Fabrice,
>
> When I was evaluating X-Ray equipment, I brought precision ball bearings 
> (I think they were .050").
>
> Each machine had some sort of measurement tool, but no matter the machine 
> or changing focus, tilting 50-75 degrees, etc., the .050" ball bearing was 
> my benchmark.
>
> To stop the ball bearing from rolling around on the table or assembly, I 
> glued it to a small piece of conductive composite material (left-over wave 
> solder fixture stock).
>
>
> Al Kreplick
> Sr. Manufacturing Engineer
> Circuit Card Assembly
> Air-toAir/Precision Strike/Land Combat
> Raytheon Integrated Defense Systems
> 978-470-9931office
> 978-245-1702 pager
> 978-470-4307 fax
> [log in to unmask]  
>
>
>
> fabrice pires <[log in to unmask]> 
> Sent by: TechNet <[log in to unmask]>
> 09/09/2008 11:01 AM
> Please respond to
> TechNet E-Mail Forum <[log in to unmask]>; Please respond to
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>
> To
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> cc
>
> Subject
> [TN] precise void size measurement
>
>
>
>
>
>
> Hi Techneters,
>
> I would like your advices on the best way to calibrate XRay pictures in 
> aim to measure precisely voids inside BGA balls, after assembly.
> Everyone should agree on the fact slight setup variation on XR equipment 
> could change significantly the void size results.
>
> Do you have any trick to improve precision measures whatever the XR 
> equipment?
> Does the use of any reference/calibration on boards exists in that aim?
>
> Fabrice
>
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