After image quality needs are met I always looked at the difference from
a maintenance standpoint. The sealed tube is simpler but its
replacement cost is in the thousands of dollars whereas the filament for
an open tube is usually several hundred dollars but requires a vacuum
system in the machine to evacuate the tube prior to use so the machine
is slightly more complex. Manufacturers often offer both types on their
machines. Compare cost, expected life of each between replacements, and
image quality tradeoffs (if any) and make a decision from there.
Mike
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bob Willis
Sent: Monday, December 07, 2009 6:10 AM
To: [log in to unmask]
Subject: Re: [TN] X-Ray Systems
I first started using x-ray systems from Nicolet, then X-Tek and over
the
last few years have been using systems from DAGE. I will let the
commercial
people talk about features but it's the image you can see and capture
which
is the key feature for the majority of users!!
The best advice I can give anybody is don't buy just on budget as your
will
be disappointed, a picture is worth a thousand words and that should
make
the selection for you, can you see what you need to see and show others?
I
know some of contract assembly customers who have purchased systems
because
their customers wanted x-ray inspection. The system could not show many
of
the current industry problems so it was very rarely used.
When equipment is being demonstrated to you and defects are being
illustrated ask yourself could you do that same and explain to other
members
of your staff what you are seeing? If you can't see it they won't
either.
Its what you want or need to see is the most important issue, can the
system
find current industry problems like, marginal wetting, cracks in PCB
tracks,
dendrites, head in pillow, open plated through holes etc etc. Don't
underestimate the time to find some defects, but if the system can't
show
and capture them at a resolution that is useful this is a real issue.
Also
make sure the support and advice is sound, talk to as may users as
possible
on their practical experience. Suppliers should be happy to provide a
list
for you to contact.
If you use a system for a period of time you get the best out of it
learning
about many of the system features that many people pay for but don't
often
use like measurement capability particularly for PoP Technology. Running
training classes and making x-ray training material as I have done over
many
years it's also important to spend time optimising the equipment, proper
set
up and calibration takes a little time but will get the perfect images
you
want and in may cases need during failure analysis.
I have included some image on this pdf file as examples of what you need
to
be able to see
www.bobwillis.co.uk/xray/bobwillisXRayExamples.pdf
Many thanks and happy holidays
Bob Willis
2 Fourth Ave, Chelmsford, Essex, CM1 4HA England
Tel: (44) 1245 351502
Fax: (44) 1245 496123
Mobile: 07860 775858
www.ASKbobwillis.com
www.SolderingStandards.com
New Package on Package Assembly & Inspection Workshops 21th January ITRI
www.ASKbobwillis.com/PoPWorkshops.pdf
Printed Board Inspection & Quality Control Workshop 9th June at ITRI
www.ASKbobwillis.com/FAWorkshops.pdf
Practical Failure Analysis Workshop 10th June at ITRI
www.ASKbobwillis.com/FAWorkshops.pdf
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Eli Sarig
Sent: 03 December 2009 16:55
To: [log in to unmask]
Subject: [TN] X-Ray Systems
Hi all,
We are looking for new analytic X-Ray system especially for BGA and QFN
solder joints inspection. Most of the leading systems use open tube.
However, there is one manufacturer who declares that he use closed tube
-"Sealed transmissive type of X-Ray tube" According to this
manufacturer,
the best system can recognize 100nm features size-which is fantastic! My
question: If you know how this sealed tube works, what is your opinion
regarding the differences between the usual open tube and this specific
closed tube? Which technology is better?
Thanks,
Eli.
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