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Subject:	Re: Particulate matter
From:	Tom Parkinson - Quality System Manager <[log in to unmask]>
Reply To:	TechNet E-Mail Forum.
Date:	Tue, 16 Oct 2001 11:58:23 -0400
Content-Type:	text/plain
Parts/Attachments:	text/plain (42 lines)

As a general rule for cleanliness inspection - IPC-A-610-C says VISUAL.
For other items on the assembly, yes - magnification may be required per
the chart you referred to.

If one uses enough magnification - you can always find something that
looks wrong. We try to avoid this situation.

Also, JSTD-001-C refers to visual for cleanliness inspection of lint,
dross, and particulate matter also. It goes into more detail if ionic
(and other) testing is required and establishing a cleanliness spec for
the assembly (C-22 is the default).

There are over 15 pages of information on cleaning & testing for
cleanliness in the IPC-HDBK-001 with Amendment 1 which compares the
JSTD-001 Rev B to C.  There are numerous references to other standards
in these pages if you wish to find more material.

Tom Parkinson - WinTronics, Inc.

> Mary Jane Chism wrote:
>
> I have a questions concerning the power of magnification that should
> be used to inspect a populated assembly for particulate matter. I have
> reviewed the IPC-A-610 and also the IPC-A-600 manuals for indication
> of what power of magnification used to inspect lint, dross, etc. I
> really did not find an answer, unless I am looking in the wrong place.
> It seems the naked eye would be sufficient, but our manufacturing is
> telling us to inspect a 7X. If anyone has an answer, we would
> appreciate it. Thanks.

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