Yes, it depends! In the instruments I used to make, they measured to
within 1% of estimated asymptote or 15 min, whichever was the shorter.
By curve fitting, the software extrapolated to asymptote and then
analysed the 2 or 3 major components that made up the total curve (e.g.
if there was a component due to activators in a rosin matrix, this would
dissolve slowly, while salt from fingerprints would dissolve rapidly),
thus determining the ug/cm² eq. NaCl for each type of contaminant and
the printout gave a list of possible contaminants creating each
component curve shape. Effectively, although it was limited to 15 min
actual measurement, some contaminants (e.g. substrate leaching) took
hours or days to asymptote and this was indicated. Of course, to have a
test that long would be impossible, because CO2 absorption (which was
compensated for in these instruments) would be greater than the
dissolved leachates and the accuracy would be lower than a real 15 min test!
Brian
On 26/01/2012 18:46, Stadem, Richard D. wrote:
> The minimum time is ten minutes. Read all about this in IPC-HDBK-001 section 8.3.6 and 8.3.7.
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Garcia, Rigo (GSFC-300.0)[MANTECH SRS TECHNOLOGIES]
> Sent: Thursday, January 26, 2012 10:16 AM
> To: [log in to unmask]
> Subject: [TN] Typical ROSE Test Duration
>
> Hi everybody!
>
> I have looked at several document but can't find the answer. This should be an easy one for my TechNet buddies though.
>
> Does anybody know what the typical duration for the ROSE Test is?
>
> Rigo Garcia
>
> Sr. Quality Assurance Engineer
> Workmanship Standards, Code 300
> NASA, Goddard Space Flight Center
> Greenbelt, MD 20771
> Phone. (301) 286-6129
> Fax. (301) 286-6576
>
>
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