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October 2010

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From:
"Stadem, Richard D." <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Stadem, Richard D.
Date:
Thu, 14 Oct 2010 13:39:04 -0500
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I use a running average, and any failures I document as to why. For example, if there was a portion of the comb pattern that has excess solder that caused a lower than average reading, or even a reading less than the minimum required, but there was no evidence of any flux residue, dendritic growth, etc, as a result of failure to clean, then I discount or exclude that particular reading and note it on the qualification document. Strictly going by the Telcordia requirements, I would seldom pass a SIR qualification otherwise.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bev Christian
Sent: Thursday, October 14, 2010 1:30 PM
To: [log in to unmask]
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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