Hi Greg, I'm sorry I don't have a copy of IPC-6012B. Just IPC-6012A. But in general I would expect that if you wish to deviate from the standard you must specify it on the drawing, including the specific exclusions or optional exceptions. Also you must specify the requirements in such a way as to not have them be ambiguous or misinterpreted. I have not seen the list of exceptions but maybe someone who has the latest copy of the spec can review them with us and you can make a determination as to what level of documentation is required. Then the manufacturer can easily read down the specification 'tree' in the document and determine exactly what you require for your board to meet spec. Best regards, Bill Brooks - KG6VVP PCB Design Engineer , C.I.D.+, C.I.I. Tel: (760)597-1500 Ext 3772 Fax: (760)597-1510 e-mail:[log in to unmask] http://www.dtwc.com http://pcbwizards.com -----Original Message----- From: Brionez, Gregory [mailto:[log in to unmask]] Sent: Tuesday, January 25, 2005 10:09 AM To: (Designers Council Forum); Brooks,Bill Subject: RE: [DC] IPC 6012 Some Clarification IPC 6012B Has a Performance Specification Sheet for Space and Military Avionics A part of that sheet has some Exceptions to IPC-6012B Class 3 Performance attributes classified as Class 3/A requirements. What I want to know is if I specific Build per IPC-6012B Class 3/A do I have to identify each exception on the rest of my fabrication notes? Thanks Paul Brionez - CID <mailto:[log in to unmask]> [log in to unmask] <mailto:[log in to unmask]> PCB Designer PH: 847-673-2718 x1394 FAX: 847-673-9789 DIVISION: Electronic/Systems MPC Products Corporation <http://www.mpcproducts.com> ISO 9001 Certified Skokie, IL USA <http://www.mpcproducts.com> -----Original Message----- From: DesignerCouncil [mailto:[log in to unmask]]On Behalf Of Brooks,Bill Sent: Tuesday, January 25, 2005 11:59 AM To: [log in to unmask] Subject: Re: [DC] IPC 6012 Vague question Greg... I will guess at what you are trying to point out then... The IPC-6012A defines the qualification and performance criteria for rigid printed circuits but maybe what you are getting at is the performance class qualification under that specification, i.e. which class it is categorized under... class 1 - General, class 2 - Dedicated Service or class 3 - High Reliability. The spec breaks out requirements for the based upon which class the board belongs in. Did you get a job that did not specify the class? If you are doing Aerospace design work your classification would be class 3 for instrumentation involved in flying the plane or space vehicle... however the entertainment equipment would probably not be required to meet that level of performance. These are set by the 'end use' of the item and must be defined up front in the design process according to IPC-2221. Did that even come close to what your are fishing for? Best regards, Bill Brooks - KG6VVP PCB Design Engineer , C.I.D.+, C.I.I. Tel: (760)597-1500 Ext 3772 Fax: (760)597-1510 e-mail:[log in to unmask] http://www.dtwc.com http://pcbwizards.com -----Original Message----- From: Brionez, Gregory [mailto:[log in to unmask]] Sent: Tuesday, January 25, 2005 8:17 AM To: [log in to unmask] Subject: [DC] IPC 6012 Question for all the Aerospace/Military designer or anyone who can answer this. When you specify "Build per IPC 6012 .... what do you use to at the end to control the exceptions? TIA <http://www.mpcproducts.com/spacer.gif> <http://www.mpcproducts.com/spacer.gif> <http://www.mpcproducts.com/spacer.gif> <http://www.mpcproducts.com/spacer.gif> Paul Brionez - <mailto:[log in to unmask]> CID [log in to unmask] PCB Designer PH: 847-673-2718 x1394 FAX: 847-673-9789 DIVISION: Electronic/Systems <http://www.mpcproducts.com/> MPC Products Corporation ISO 9001 Certified Skokie, IL USA <http://www.mpcproducts.com/> <http://www.mpcproducts.com/spacer.gif> <http://www.mpcproducts.com/spacer.gif> ---------------------------------------------------------------------------- ----- DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF DesignerCouncil. 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