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September 2000

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Subject:
From:
Ian Hanna <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 1 Sep 2000 15:15:55 -0400
Content-Type:
text/plain
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text/plain (112 lines)
As has been mentioned, AOI will not pick up interconnect defects.  It would
also not be a reliable way of testing inner-layer functions on a multi-layer
product.  I would submit that electrical test provides a much greater margin
of overall acceptability and functionality.  Using a 'bed-of-nails' type
electrical test is also significantly faster than optical scanning, although
this technique is not feasible for fine-pitch work.

Regards,

Ian Hanna
Quality Manager
Lazer-Tech Ltd.
Voice: 416.291.7727.233
FAX:   416.291.0325
[log in to unmask]


-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of
[log in to unmask]
Sent: Friday, September 01, 2000 2:21 PM
To: [log in to unmask]; [log in to unmask]
Subject: Re: [TN] Automatic Optical Test (AOT)

Franklin,

I have not read the article, but a user of boards.  Here are my first,
knee-jerk,
questions.  Perhaps the article answered them, and I should get a copy of
the article.

On a twelve layer multilayer board, how would AOT verify compliance to the
IPC-D-356
net list that I provide?
Does the addition of Laser vias, buried and blind vias to the design change
anything?
Buried resistance?

I think it sounds like an imaginative idea, perhaps reducing the Capitol
$$$'s required
for a board shop.
Still, I am standing here, wondering what to do with this bucket of cold
water.

George Franck
Raytheon Company
Falls Church VA


Franklin D Asbell wrote:

> Just read an article in "The Board Authority" regarding Automatic
> Optical Test (AOT).
>
> Just wondering what you assemblers or purchasers of bare boards thoughts
> are on fabricators performing 'optical testing' (visual, AOI)  instead
> of 'contact testing' (BON, probe)????
>
> An example: You state all boards to be electrically tested for
> opens/shorts, and instead of throwing the boards on our flying probe or
> bed-of-nails equipment I decide to put this on my AOI after setting it
> up to flag for opens/shorts, would you be satsified with this method?
>
> Franklin D Asbell
> Network Circuits, Inc.
> Irving, Texas 75061
>
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