Following prepared by Tim Crawford at the EMPF:

>Daan,
>
>The "thou shalt not have any visible residue" clause is meant to be
>visible with no magnification.  You will still need to cleanliness test
>using some one of the suggested cleanliness tests, and you will still need
>to inspect at 10X for solder joint defects, solder balls, etc.  But
>visible residue is by naked eye.
>
>Tim Crawford
>EMPF
>
>----------
>From:   Jack Crawford
>Sent:   Wednesday, February 05, 1997 6:21 PM
>To:     crawfot
>Subject:        ASSY : cleanliness specification
>
>>Resent-Date: Wed, 5 Feb 1997 16:04:29 -0800
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>>Date: Wed, 05 Feb 1997 19:16:12 +0100
>>From: "D. Terstegge" <[log in to unmask]>
>>MIME-Version: 1.0
>>To: [log in to unmask]
>>Subject: ASSY : cleanliness specification
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>>
>>How should the specification for visual cleanliness in the MIL-STD-2000A
>>be interpreted ? It mentions that no residues may be visible on the
>>assembled board, but it does not say anything about the magnification to
>>use. For some inspectors (and customers) this means that boards which
>>have residues on them that are only visible with 10 times magnification,
>>should be re-cleaned.
>>
>>Daan Terstegge

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