Probing minds everywhere at a minimum, would expect a capability to access all required testable nodes/nets.
Dewey
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: Thursday, May 09, 2013 1:03 PM
To: [log in to unmask]
Subject: Re: [TN] ICT Coverage
But it all depends on the specific ICT capabilities, and the circuit type and complexity. For some ICT equipment and design combinations, the test capability may only be 80%, for others 100%. Programming skill such as what Mr. Kondner describe and other factors also affect just how comprehensive the test can be.
That is why I don't think there is a standard.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Robert Kondner
Sent: Thursday, May 09, 2013 2:37 PM
To: [log in to unmask]
Subject: Re: [TN] ICT Coverage
Hi,
You really need to look at what ICT does not cover and figure out if that will be caught in use or functional test.
The most important piece of data is an error log. You need to look at the types of problems you had in the past as that is a pretty good prediction of future problems.
Also, look at your product as a collection of line items. A major source of problems is placement machine setup. If you have a part, say R1 - 1K res, and you can't access the nodes to test R1, look at the other 1k resistors in the same line item. If they are present and correct than R1 is probably ok.
If R27 should be the same 1K, but you find 1 ohm, chances are R1 is wrong.
Now if that 1K res is an 0201 and your PnP randomly drops 0201 you better include a manual check for R1 in your inspection requirements.
In general if you got 98% I would say good. If you get down to 90% I would say bad. I would give 95% a C+.
Bob K.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Furrow, Robert
Sent: Thursday, May 09, 2013 3:25 PM
To: [log in to unmask]
Subject: [TN] ICT Coverage
Hi all,
I know the goal is "as much as possible", but what is a reasonable expectation for % coverage during ICT for Class 2 products?
Thanks,
Bob Furrow
Quality Assurance Engineer
Honeywell Aerospace - Sarasota
941-360-6285
[log in to unmask]
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