As stated in IPC-6012 A section: 4.2.2 Referee Test: “Two additional micro- section sets from the same panel may be prepared and evaluated for micro- section defects that are considered to be isolated or random in nature or caused by micro-section preparation. For acceptance, both referee sets must be defect free” What is the interpretation of “Two additional micro- section sets”? Is it limited to the micro-section plating structure in which the defect was detected. My thoughts are based upon IPC-6012A Table 4-3 Acceptance Testing and Frequency. The table identifies the frequency of micro-section evaluation based on PWB designs with a signal plating structure. Does this table represent a micro-section set. As noted in. IPC- 6012A section 3.6 Structural Integrity states “Blind and Buried vias shall meet the requirements of plated-through holes.” This sentence requires redeployment of table 4-3 for each additional plating structure within the PWB as a set. For example: If a micro-section evaluation revealed low copper in one of the 9 different plating structure it would be have no bearing on the other 8 plating structures. The referee sections would only be relevant to the set structure the defect was detected in. The example can be applied to many attributes; however in each case the deficiency must be isolated or random. With that said: What is the interpretation of micro-section set? Thanks Kerry --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e 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 -----------------------------------------------------