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October 2010

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Subject:
Re: Interpretation of SIR Requirements
From:
Inge <[log in to unmask]>
Reply To:
Inge <[log in to unmask]>
Date:
Thu, 14 Oct 2010 23:35:31 +0200
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text/plain (139 lines) 
A fellow nextdoor has been digging in those questions for years.  Maybe you 
can find something useful.
/Inge

www.europeanleadfree.net/site/upload/document/a232525/SIR%20and%20ECM.pdf ·


----- Original Message ----- 
From: "Bev Christian" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, October 14, 2010 9:12 PM
Subject: Re: [TN] Interpretation of SIR Requirements


Richard,
I am surprised to hear that you "seldom pass a SIR qualification otherwise" 
using the Telcordia spec for SIR, because at Nortel we used Telcordia (or 
Bellcore for us old guys) and even set a higher resistance cut-off and used 
an IPA/toluene mixture to pull stuff into solution to put on the coupons and 
we passed most stuff.  BUT that was using an average.
Bev

-----Original Message-----
From: Stadem, Richard D. [mailto:[log in to unmask]]
Sent: Thursday, October 14, 2010 2:39 PM
To: TechNet E-Mail Forum; Bev Christian
Subject: RE: Interpretation of SIR Requirements

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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