According to *4.3.3.3 in IPC 9701, for data loggers, failure is defined as a maximum of 20% nominal resistance increase within a maximum of five consecutive scans. But the TCR of the daisy chains copper conductors is 3900 ppm/C, therefor, the ohmic resistance readings at 100 C will increase by more than 20% of the nominal resistance, taken at the start of the test, at room temperature. Thus this imply that the nominal resistance and all the other resistance measurements shoul be taken at the same temperature? --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------