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
>>>
>>>
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