?
Fabrice,
Never mind the void and lack of material, think of it as measuring the materials AROUND the void. If you wanted to get really picky, get a ball brick or whatever of the same material as your solder. But I think your quest for perfect void size measurement is frankly a waste of time in my opinion.
Bev
RIM
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of fabrice pires
Sent: Wednesday, September 10, 2008 8:40 AM
To: [log in to unmask]
Subject: Re: [TN] precise void size measurement
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
> fabrice pires <[log in to unmask]>
>
>
> To
> [log in to unmask]
> 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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