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September 2002

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Subject:
From:
Don Vischulis <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 30 Sep 2002 10:20:27 -0500
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Daan:

I believe that the equivalence factors are also contained in an appendix to
MIL-P-55110.

Don Vischulis

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of d. terstegge
Sent: Monday, September 30, 2002 8:03 AM
To: [log in to unmask]
Subject: Re: [TN] Ionograph measurements


Thanks Ron, I'll have a look at these standards. Unfortunately so far
nobody could give me the evidence that I'm allowed to use an
"equivalence factor" when measuring ionic contamination.
The document that Per-Erik referred to comes very close (it mentions
how the "A" version of the Ansi J-std-001 had an appendix with a
statement about the equivalence factor), and I'm still expecting a
report from Graham.

Best regards,

Daan


>>> [log in to unmask] 09/30/02 01:06pm >>>
Daan, the info is shown in table VIII in MIL-P-28809. It probably is
also in
MIL-C-28809, but I cannot find my copy of "C" to verify that.

Ron Dieselberg
CMC ELECTRONICS
CINCINNATI
[log in to unmask]


-----Original Message-----
From: Graham Naisbitt [mailto:[log in to unmask]]
Sent: Friday, September 27, 2002 11:54 AM
To: [log in to unmask]
Subject: Re: [TN] Ionograph measurements


> Hi Technet,
>
> One of our customers is complaining that the upper limit for our
> ionograph test is set at 3.1 micrograms/cm2 instead of the 1.56
> micrograms/cm2 that the IPC/EIA J-STD-001C prescribes is section
8.3.6.
>
> I know there exists a document  (probably an IPC or MIL-spec)
> explaining how the 1.56 limit should be corrected for the exact type
of
> machine. For the Alpha Ionograph 500M the conversion factor is 2,
> resulting in the 3.1 micrograms/cm2 limit.
> However I can't remember where exactly this information can be
found,
> and I don't even know if it's still valid. Does anyone has a clue for
me
> ?
>
> Daan Terstegge
> Unclassified mail
> Personal Website: http://www.smtinfo.net
>
>
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Daan

I have a copy that I shall dig out for you. If anyone else needs a copy
let
me know

--
Regards, Graham Naisbitt
[log in to unmask]
Mobile: +44 (0)79 6858 2121

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