You would need good dynamic range (more important than the few thousand
X) to take care of build in heat sink, shielding layer etc. etc. More
of a problem soon... If it is not now...;-(
jk
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of
>Reuven ROKAH
>Sent: Thursday, May 22, 2003 12:43 AM
>To: [log in to unmask]
>Subject: Re: [TN] X-Ray Inspection of BGAs
>
>
>To find shorts - its easy , from the top.
>To find opens - you need to tilt the PCB as much as it
>possible or 3D X Ray. To find voids - you need software to
>measure and calculate the % comparing to IPC , 1 mil accuracy in OK.
>
>Best Regards
>
>ROKAH Reuven
>
>e mail: [log in to unmask]
>
>
>
> "Anderson, Greg
> (IndSys, To:
>[log in to unmask]
> GEFanuc, NA)" cc:
> <Greg.Anderson@G Subject: [TN]
>X-Ray Inspection of BGAs
> EFANUC.COM>
> Sent by: TechNet
> <TechNet@LISTSER
> V.IPC.ORG>
>
>
> 21/05/03 11:58
> PM
> Please respond
> to "TechNet
> E-Mail Forum.";
> Please respond
> to "Anderson,
> Greg (IndSys,
> GEFanuc, NA)"
>
>
>
>
>
>Technetters,
>
>We are currently evaluating off-line X-Ray inspection machines
>for the process development and periodic process monitoring of
>BGA, u-BGA, etc Printed Wiring Assemblies. For those of you
>who have such machines:
>
>1) How important is a feature that allows actual measurement
>of the ball diameter vs. "uniformity" of the balls? The
>candidate systems accuracy claims vary from +/- 0.001" down to
>+/-0.00025". Is it possible or desirable to measure and log
>the diameters? (intuitively, I believe so, but maybe the
>"noise" of part to part, or PWA warpage makes this irrelevant).
>
>2) How important is the ability to view at oblique angles
>greater than 45 degrees? Do you need to go to 75 degrees?
>
>3) How much magnification is "enough"? 600X ? 1200X?
>
>4) Are you able to develop and use "Printed Wiring Assembly
>Specific" programs? That is, can you build an inspection
>routine to look at one or more locations on the assembly,
>store it, then call it later when that product comes around
>again? How difficult is it to program? Can it be done by
>someone other than an engineer?
>
>Please, if you are going to mention specific systems, respond
>off line (and off the record, if need be), to avoid flaming
>repercussions. I need frank responses.
>
>Thanks,
>Greg Anderson
>Senior Mfg Engineer
>GE Fanuc Automation
>phone: 434-978-5181
>
>---------------------------------------------------
>Technet Mail List provided as a free service by IPC using
>LISTSERV 1.8e To unsubscribe, send a message to
>[log in to unmask] with following text in the BODY (NOT the
>subject field): SIGNOFF Technet To temporarily halt or
>(re-start) delivery of Technet send e-mail to
>[log in to unmask]: SET Technet NOMAIL or (MAIL)
>To receive ONE mailing per day of all the posts: send e-mail to
>[log in to unmask]: SET Technet Digest
>Search the archives of previous posts at:
>http://listserv.ipc.org/archives Please visit IPC web site
http://www.ipc.org/html/forum.htm for additional information, or contact
Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
-----------------------------------------------------
---------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text
in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt
or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET
Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the
posts: send e-mail to [log in to unmask]: SET Technet Digest Search the
archives of previous posts at: http://listserv.ipc.org/archives Please
visit IPC web site http://www.ipc.org/html/forum.htm for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700
ext.5315
-----------------------------------------------------
---------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/html/forum.htm for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
-----------------------------------------------------
|
