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Reply To: | TechNet E-Mail Forum. |
Date: | Tue, 11 May 1999 10:53:55 -0400 |
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Hi Nick. You should find that many of the ICT fixturing houses are
more than capable of producing acceptable vacuum fixtures with top
side probing without resorting to hydraulics. I do have both, but the
hydraulic ones are for non-standard interfaces (read as: no vacuum
available)
If you have a vendor telling you that you need to use hydraulics on
your fixtures, I'd love to know their reasoning (other than making
some extra bucks)
----
A thought for you: trot out your DFT homework!
- Topside probing has less accuracy. Make your test pads large with a
nice surface to hit.
- Give yourself lots of component-to-pad spacing, especially around
large components
- Don't use device pads as test points if a device is mounted there
also.
- Expect your fixturing costs to be substantially higher.
Hope this is helpful -
-------------------------------------------------------------
Robert D. Green - Supervisor, Test Engineering
Hadco - Value Added Manufacturing
e-mail [log in to unmask]
______________________________ Reply Separator _________________________________
Subject: [TN] Component Side Test Points
Author: Nick Nicolaides <[log in to unmask]> at smtplink-hadco
Date: 5/11/99 8:26 AM
We are in the process of evaluating using top (component side) test points
in addition to the solder side. We know this will be a major change in our
test fixtures, that is going to a clam shell. Also what is your experience
for the ICT: vacuum vs. hydraulics?
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