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January 2008

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Subject:
From:
Graham Naisbitt <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Graham Naisbitt <[log in to unmask]>
Date:
Thu, 3 Jan 2008 16:52:05 +0000
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Hi Phil

I was going to respond with a funny to your question, but then  
discovered some interesting, but probably useless, information:

You could ask that the boards are "Scrupulously" cleaned.

If you look up scrupulously - derived from scrupulous is: 2 -  
historical a unit of weight equal to 20 grains, used by apothecaries.•  
archaic a very small amount of something, esp. a quality.
ORIGIN late Middle English : from French scrupule or Latin scrupulus,  
from scrupus, literally ‘rough pebble.
GRAIN: the smallest unit of weight in the troy and avoirdupois  
systems, equal to 1/5760 of a pound troy and 1/7000 of a pound  
avoirdupois (approximately 0.0648 grams). [ORIGIN: because originally  
the weight was equivalent to that of a grain of wheat.]

Hmmm maybe the ancients knew more than we thought.....and my funny is  
more useful than I thought!?

However, and on a more serious note, I have had some very interesting  
results from running the latest SIR test method on unassembled boards  
for a couple of customers. In most instances we found that the boards  
would contribute far more failure than might be found from the  
assembly process residues. I did make a presentation to the SIR TG  
meeting in Schaumberg on this topic. If you or anyone would like a  
copy ask me off-line and give me your mailing address - cos the file  
is around 60mb.

Kindest regards
Graham Naisbitt

[log in to unmask]

www.gen3systems.com

Phone: +44 (0)12 5252 1500
Mobile: +44 (0) 79 6858 2121


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Gen3 Systems Limited Unit B2, Armstrong Mall Southwood Business Park Farnborough Hampshire GU14 0NR - UK ENGINEERING RELIABILITY IN ELECTRONICS Registered Number: 4639449 (England & Wales). Registered Office as above. DISCLAIMER : This message is intended only for the use of the individual or entity to which it is addressed and may contain information which is privileged, confidential, proprietary, or exempt from disclosure under applicable law. If you are not the intended recipient or the person responsible for delivering the message to the intended recipient, you are strictly prohibited from disclosing, distributing, copying, or in any way using this message. If you have received this communication in error, please notify the sender and destroy and delete any copies you may have received. Any views or opinions presented in this email are solely those of the author and might not represent those of Gen3 Systems Limited. Although Gen3 Systems Limited has taken reasonable precautions to ensure no viruses present in this email, Gen3 Systems Limited can not accept the responsibility for any loss or damage arising from the use of this email or attachments. On 3 Jan 2008, at 14:44, Phil Nutting wrote: > Good Morning and Happy New Year to All, > > Let me start by confessing my ignorance relative to cleanliness of > circuit boards. We have no idea what numbers to specify that fit > into the IPC testing methods for board cleanliness. If I tell my > CMs to make the boards clean, it would be good to specify a target > value and or test method. > > Can someone give me some guidance on how to chose these > specifications? What are worth while tests and which ones are > window dressing? > > I've read through some of the IPC tests methods and my head hurts. > > Thanks in advance, > > Phil Nutting > > Note: All the information contained in this e-mail and its > attachments is proprietary to Kaiser Systems, Inc. and it may not be > reproduced without the prior written permission of sender. If you > have received this email in error, please immediately return it to > sender and delete the copy you received. > > --------------------------------------------------- > Technet Mail List provided as a service by IPC using LISTSERV 15.0 > 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 > Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 > for additional information, or contact Keach Sasamori at [log in to unmask] > or 847-615-7100 ext.2815 > ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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 Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------

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