Well said.
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Tegehall Per-Erik
> Sent: Monday, September 30, 2002 10:04 AM
> To: [log in to unmask]
> Subject: Re: [TN] Ionograph measurements
>
>
> Daan,
>
> In a note to section 8.3.6 in I-STD-001C, it is written that
> "In comparing the sensitivity between methods, the solvent
> used to extract the residue, the method used to present the
> solvent to the assembly and the method of detecting the
> residue should all be considered. " I interpret that as you
> are allowed to and should do the correction. But if you use
> correction values, the figures given in the MIL standard are
> only valid for the models of cleanliness equipment that were
> used at that time. I guess Alpha Ionograph 500M is a later
> model, which means that it should have a different correction
> figure (probably higher since it likely has better cleaning
> efficiency).
>
> However, the use of equivalence factors has no scientific
> base. But on the other hand, neither has the method for
> cleanliness measurement. It shouldn´t be used as proof of the
> cleanliness of an assembly since it is no proof of assembly
> reliability. It is a good tool for process control, i.e. to
> control that the cleanliness of assemblies manufactured in
> certain line does not change with time. In my opinion, its
> use should be limited to that.
>
> Regards
> Per-Erik
>
> -----Ursprungligt meddelande-----
> Från: d. terstegge [mailto:[log in to unmask]]
> Skickat: den 30 september 2002 15:03
> Till: [log in to unmask]
> Ämne: 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]
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