Eddie,

By the SIR Handbook I assume you mean IPC 9201, "Surface Insulation
Resistance Handbook".  While a good overview on method, I think a better
discussion relative to the 100 megohm limit would be found in
IPC-TR-467, "Supporting data and numerical examples for
ANSI/J-STD-001B".

Jim

===============================
Jim Maguire
Senior Principal Engineer
Boeing Information Space & Defense Systems
PO Box 3999  M/S 3W-97
Seattle, WA  98124-2499
Phone (253)657-9063     Fax (253)657-8903
Pager (206)982-3737
Email:  [log in to unmask]
================================

> ----------
> From:         Eddie Brunker[SMTP:[log in to unmask]]
> Reply To:     TechNet E-Mail Forum.;Eddie Brunker
> Sent:         Monday, April 06, 1998 2:49 AM
> To:   [log in to unmask]
> Subject:      [TN] SIR
>
> Hi,
>
> I would be interested to know how the figure of 10 * 8 ohms was
> reached as a
> standard for IPC class 3. I have been told that as a standard this
> figure is
> quite a safe level. How do we know?
>
> With regard to the cleaning assessment it would be nice to see the SIR
> aspects being pushed on Technet/IPC more. I would also like to see
> more SIR
> info. circulated. I have read the IPC SIR handbook but still have alot
> of
> unanswered questions.
>
> Regards
>
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