Hill, Mike E. wrote:
>
> I looking for your definition of 100% Electrical Test of bare boards.
> For example, do you include all feed through vias on the wiring side in
> your test data file? If you add these, many may not be used in the
> customer's assembly test but they often cause false errors in bare board
> test due to Soldermask in the holes. Do you include all plated Tooling
> holes? Do you call it 100% if you test part of the board and AOI on
> another part? Do you only test/probe end of nets? Do you always probe
> gold fingers?
>
> I would like to hear what how you define it.
>
> Mike Hill
>
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Hi Mike -- I believe you're going to have fun with this one.
IMO, "100% electrical testing" depends on the testing requirements
specified in the product definition data (master drawing).
As a minimum, it would be "shorts & opens" and is based on cable
testing. Which for "shorts" should be a "worst case" in that all
conductive patterns (except the one being tested) are electrically tied
together and grounded, and the test voltage is applied to a single
"isolated" conductive pattern. Then the test system "steps-through"
each of the conductive pattens (networks) and performs a "n-1" test
sequence. "Opens" are tested "end of net -to- end of net".
Additional "100% electrical testing":
1 Interconnection resistance (end of net -to- end of net)
2 Impedance
3 Hi-Pot testing
4 "Partial Discharge" for hi-voltage applications
In summary-- a trial balloon "term and definition"
"100% Electrical Testing" -- A series of electrical tests and
measurements to assure that all conductive patterns, nonconductive
patterns, components, or functional performance of a "device (product)
under test" meets all the electrical performance requirements as
specified in the product definition data. Electrical testing may
include test such as; shorts, opens, impedance, resistance, capacitance,
inductance, hi-pot, S-parameter, partial discharge, and electrical
functional performance to identify a few.
IMO, as you might have guessed, "100%" is all inclusive and should be
specified but more frequently "implied" in the product definition data.
Ralph
--
Ralph Hersey
Ralph Hersey & Associates
3885 Mills Way
Livermore, CA 94550-3319
PHN/FAX: 925.454.9805
e-mail: [log in to unmask]
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