Bev, Others may have a different opinion, but I would take a look at section 13-2 of the GR-78-CORE under the adhesives section, 13.2.7. Best Regards, Joe Russeau ---- Original Message ----- From: "Bev Christian" <[log in to unmask]> To: "Joe Russeau" <[log in to unmask]>; "TechNet E-Mail Forum" [log in to unmask]> Sent: Thursday, October 14, 2010 5:10 PM Subject: RE: [TN] Interpretation of SIR Requirements > > >> What about if you are testing an underfill? >> Bev >> >> -----Original Message----- >> From: Joe Russeau [mailto:[log in to unmask]] >> Sent: Thursday, October 14, 2010 4:01 PM >> To: TechNet E-Mail Forum; Bev Christian >> Subject: Re: [TN] Interpretation of SIR Requirements >> >> Bev, >> >> For the Telcordia document, the sample groups are defined in table 13-3 >> in >> my copy and a description of the sample groups follows that table. >> >> For the J-STD-004 B version, EVERY SIR value for processed samples must >> maintain above 100 megohms. Keep in mind that the J-STD-004 B version is >> now calling out the new SIR method 2.6.3.7, which is continuous >> monitoring >> (every 20 minutes). The old 2.6.3.3 method had only five measurement sets >> taken and only two counted towards passing the test (96 and 168 hours). >> With the new method more measurements are taken and require more data >> evaluation. That said, the IPC SIR TG has agreed that when method >> 2.6.3.7 >> is used a 24-hour grace period should be given before any data starts to >> count due to the boards acclimating to the test conditions. The same >> comments have also been made by flux TG about a 24-hour grace period. I >> always give a 24-hour grace period when performing per J-STD-004, unless >> I >> don't see any sort of recovery in the SIR results after 24-hours. If >> they >> maintain below the pass limit after 24-hours, then I spend the time >> visually >> inspecting for a root cause. >> >> I hope this helps you. >> >> Best Regards, >> >> Joe Russeau >> >> >> >> ----- Original Message ----- >> From: "Bev Christian" <[log in to unmask]> >> To: <[log in to unmask]> >> Sent: Thursday, October 14, 2010 2:29 PM >> Subject: [TN] Interpretation of SIR Requirements >> >> >>> TechNetters, >>> In GR-78-CORE, Issue 1, 1997, SIR Test Procedure 13.1.3.2 R13-6 [808], >>> it >>> states (capitalization mine) "The average insulation resistance >>> (megohms), >>> for EACH SAMPLE GROUP, taken at 24 hours and again at 4 days, shall be >>> greater than the minimum specified in table 13-4. >>> >>> In IPC J-STD-004B, 3.4.1.4.1 Reporting SIR Test Results, the first >>> criteria for passing the SIR test is: "All SIR measurements on all test >>> patterns shall exceed the 100 Mohm requirements." >>> >>> My questions are as follows: >>> 1) In the Telecordia document, what constitutes a "sample group"? One >>> comb >>> pattern? All the comb patterns on one coupon? All the coupons being >>> used >>> to test one material? >>> 2) For the IPC method does the criteria apply to the readings at the end >>> of the test? First and last? At every measurement? The document seems >>> vague to me. >>> >>> Bev >>> RIM >>> >>> >>> --------------------------------------------------------------------- >>> This transmission (including any attachments) may contain confidential >>> information, privileged material (including material protected by the >>> solicitor-client or other applicable privileges), or constitute >>> non-public >>> information. Any use of this information by anyone other than the >>> intended >>> recipient is prohibited. If you have received this transmission in >>> error, >>> please immediately reply to the sender and delete this information from >>> your system. 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