Rick, Brad, et al,
We have a Nicolet NXR1400 and have no problem at all seeing voids. Right
now I have a small BGA board in the chamber at 60 watts, 84 kilovolts and a
camera distance of 1.5 to 2 inches and I am having no problem at all seeing
voids.
Now opens are another matter altogether. You can sometimes infer opens from
the size of the apparent solder joint, but it is tricky and not a sure
thing. The 3D Nicolet or HP systems are needed for that. I presume Fein
Focus also make a 3D system as well. Also, a few months ago I put out a
Technet query to see if it were possible to use acoustic spectroscopy to
find these type of opens, but the consensus I received back from my fellow
Techneters was that the depth penetration needed was too great for this
technique to work. I was hoping it would do the trick because I would
rather spent $200K then $500K!.
regards,
Bev Christian
Nortel
> ----------
> From: Brad Kendall[SMTP:[log in to unmask]]
> Sent: Thursday, July 30, 1998 8:43 AM
> To: [log in to unmask]
> Subject: Re: [TN] Glenbrook x-ray??
>
> Rick,
> Others have already mentioned this, so I will just back them up.
> When
> I implemented BGA a couple years ago, I looked at all the X-ray machines
> on
> the market and none could see voids. I took boards with known opens
> (found
> at test) and we checked them on Glenbrook machines, HP, and Nicholia
> (spelling?) and found you would be able to see the absence of a ball or a
> short, but not opens, voids, or cracked solder joints. Now, the one
> response talked of an HP 5dx. This machine was not out then, we looked at
> the HP 4. This new one may be able to see all the defects. I did just
> see
> some pictures from an X-ray yesterday that showed voids VERY clearly.
> They
> were pictures of SMT terminal contact solder joints, but the voids were
> clear as day. I asked what machine was used to get them, they are
> supposed
> to let me know. I am sure it is a high end machine. Glenbrook makes
> good and affordable X-ray that can do certain things, but see an open or
> void, won't do it due to not being powerful enough.
>
> Good luck,
>
> Brad Kendall
> Hella Electronics Corp.
>
>
>
>
>
>
> [log in to unmask] on 07/29/98 02:27:43 PM
>
> Please respond to [log in to unmask]; Please respond to
> [log in to unmask]
>
> To: [log in to unmask]
> cc: (bcc: Brad Kendall/Hella North America Inc.)
> Subject: [TN] Glenbrook x-ray??
>
>
>
>
> Hi,
>
> We're starting to look into x-ray systems, specifically for BGA
> inspection.
> Units by Glenbrook caught my attention due to their low cost relative to
> other units on the market. Anybody have any feedback, positive or
> negative
> on their products?
>
> I'd also appreciate any other insight you might care to share regarding
> other vendors and BGA X-ray.
>
> Thanks.
>
> Rick Thompson
> Ventura Electronics Assembly
>
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