Paul and all
Thanks for the message. Be sure that I will be only too willing to share
stuff that is non-commercial.
Yes I was burned - and rightly so! It was some time ago and I had a habit of
catching up with TechNet Stuff late at night and I think I must have had one
martini too many. Anyhow, lesson learned.
If you or anyone want the latest info on SIR testing I will be pleased to
send it. I am on the IPC committees and on the ISO committee so it is bang
up to date. We are lobbying to make some pretty fundamental changes to the
existing specs, the best of which is the present IPC-TM-650.
The changes we know to be important include:
Frequent monitoring (20 to 30 minute intervals) This gives you far more
useful info and we believe, the ability to detect CAF influences.
Test voltages that are more in-line with actual circuit operating voltages.
Our National Physical Laboratory (NPL) with whom we work closely, has found
some pretty amazing results when testing at 5 volts.
I am sure that Dr Chris Hunt or Dr Colin Lea have got their TechNet Ears
on - so is this stuff published yet??
As I said earlier, anything I can share with you I will and if anyone wants
a copy of what we've got, let me know by direct email cos at this point it
gets REAL commercial. Non of this pressurised sales stuff, but surely
spamming media!!!
Regards,
Graham Naisbitt
[log in to unmask]
Concoat Ltd
Alasan House, Albany Park
CAMBERLEY GU15 2PL UK
Tel: +44 (0) 1276 691100 Fax: +44 (0) 1276 691227
----- Original Message -----
From: Paul Klasek <[log in to unmask]>
To: 'Graham Naisbitt' <[log in to unmask]>
Sent: Monday, June 07, 1999 2:10 AM
Subject: RE: [TN] SIR testing of reworked PWA's
> Hey Graham ; did you get your tail burned lately ?
> how come you're "so" cautious ; I want to know to ; you know ; as plenny
of
> us ;
> What's this spamm fears ; 'not like you ?
>
> paul
>
> -----Original Message-----
> From: Graham Naisbitt [mailto:[log in to unmask]]
> Sent: Monday, June 07, 1999 1:39 AM
> To: [log in to unmask]
> Subject: Re: [TN] SIR testing of reworked PWA's
>
>
> Jim,
>
> In order to run SIR tests, you will need an inter-digitated comb pattern
> from which the SIR measurements may be taken.
>
> If this can be provided on a redundant area underneath a suitable
component,
> such as a QFP, then you will certainly have the most representative
> information about the potential reliability of your finished assembly.
>
> However, most folks cannot provide this. There are, in addition, some
other
> technical issues that should be addressed, but I don't want to complicate
> things too much.
>
> Usually a test coupon would be used that should be representative of your
> circuit assembly i.e. same track width, spacing, process materials etc..
>
> We can help you further with this but I don't want to be flamed for
> spamming. So maybe you could get me more details off TechNet? Please let
me
> know.
>
> Regards, Graham Naisbitt
>
> [log in to unmask]
>
> Concoat Limited
> Alasan House, Albany Park Phone +44 (0) 1276 691100
> CAMBERLEY GU15 2PL UK Fax +44 (0) 1276 691227
> ----- Original Message -----
> From: Jim Wiggers <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: 04 June 1999 23:31
> Subject: [TN] SIR testing of reworked PWA's
>
>
> >Newbie looking for expert help.
> >
> >IPC-TM-650 details multiple cleanliness test methods.
> >The SIR test in section 2.6.3.3 requires a specific test board.
> >Does an industry accepted procedure exist that will permit the testing of
a
> >finished product's reworked PWA?
> >I'm not sure, is this a completely unreasonable expectation?
> >
> >Thanks for your help and attention.
> >
> >Jim Wiggers
> >NovAtel Inc.
> >
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