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 > > ################################################################ > TechNet E-Mail Forum provided as a free service by IPC using LISTSERV > 1.8c > ################################################################ > To subscribe/unsubscribe, send a message to [log in to unmask] with > following text in the body: > To subscribe: SUBSCRIBE TechNet <your full name> > To unsubscribe: SIGNOFF TechNet > ################################################################ > Please visit IPC web site (http://jefry.ipc.org/forum.htm) for > additional information. > For the technical support contact Dmitriy Sklyar at [log in to unmask] or > 847-509-9700 ext.311 > ################################################################ > ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ################################################################