Hi,
As temperature is important for the contamination measurements it seems highly recommandable to perform the measurements at constant T°C and for that reason temperature-controlled equipment should appear as an interesting solution.
Heated solution should be also particurlarly interesting for ionic contamination measurements on no-clean PCA for those performing such measurements or on some dirty PCAs. As no-clean or some dirty PCA induce a lot more residues comparatively to cleaned PCA and requires usually much longer measuring time. It could be more than 1 or even 2 hours for asymptote. Higher temperatures (up to 45°C to limit solution evaporation or other side effects) allow to reduce significantly this duration to more industrially acceptable values.
So if heated solution should be used with precaution as previously noted it can also offer some advantages.
fabrice
-----Message d'origine-----
De : TechNet [mailto:[log in to unmask]] De la part de Graham Naisbitt
Envoyé : lundi 30 janvier 2012 13:21
À : [log in to unmask]
Objet : Re: [TN] Typical ROSE Test Duration
Hello Techies
The equipment Brian refers to is Contaminometer - and they are still made, by me. Sorry for the advert but.everyone keeps talking about my competitors.
However, as regards the issue of test time, keep-in-mind that some folk recommend testing with heated solution, and temperature has a significant effect in the measurement technique. Some systems also suffer from excess temperature deviation during the test cycle and it does make a difference to your results - false positives and/or false negatives are undesirable.
Hot or warm solution has been shown to increase the risk of leaching the flame retardant (Bromine) out of the laminate, through the mask and onto the board surface. (IVF, Sweden circa 1992)
Instruments should provide compensation for both temperature and CO2 effects.
Given that Rigo is working at NASA, I thought this info might be important.
This test method is great for controlling your assembly process. It's is NOT safe to assume that tested assemblies yielding results of <1,5microgrammes of NaCl equivalence are good because it implies that it is safe to leave UP TO 1.5 micro grammes of salt on every square centimetre of your assembly.maybe, maybe not...
Hope this helps - see you in San Diego?
Graham Naisbitt
Gen3 Systems
www.gen3 systems.com
On 26 Jan 2012, at 18:12, Brian Ellis wrote:
> 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
>>
>>
>> ______________________________________________________________________
>> This email has been scanned by the Symantec Email Security.cloud service.
>> For more information please contact helpdesk at x2960 or [log in to unmask]
>> ______________________________________________________________________
>>
>> ---------------------------------------------------
>> Technet Mail List provided as a service by IPC using LISTSERV 16.0
>> To unsubscribe, send a message to [log in to unmask] with following text in
>> the BODY (NOT the subject field): SIGNOFF Technet
>> To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
>> To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
>> Search the archives of previous posts at: http://listserv.ipc.org/archives
>> For additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
>> -----------------------------------------------------
>>
>> ______________________________________________________________________
>> This email has been scanned by the Symantec Email Security.cloud service.
>> For more information please contact helpdesk at x2960 or [log in to unmask]
>> ______________________________________________________________________
>>
>> ---------------------------------------------------
>> Technet Mail List provided as a service by IPC using LISTSERV 16.0
>> To unsubscribe, send a message to [log in to unmask] with following text in
>> the BODY (NOT the subject field): SIGNOFF Technet
>> To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
>> To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
>> Search the archives of previous posts at: http://listserv.ipc.org/archives
>> For additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
>> -----------------------------------------------------
>>
>
>
> ______________________________________________________________________
> This email has been scanned by the Symantec Email Security.cloud service.
> For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________
>
> ---------------------------------------------------
> Technet Mail List provided as a service by IPC using LISTSERV 16.0
> To unsubscribe, send a message to [log in to unmask] with following text in
> the BODY (NOT the subject field): SIGNOFF Technet
> To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
> To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
> Search the archives of previous posts at: http://listserv.ipc.org/archives
> For additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
> -----------------------------------------------------
______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 16.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
For additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------
______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 16.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
For additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------
|
