Hi Bev, You do not want to degenerate [cute word here] this far. >1) Have circuits with X daisy chain parts in series and when one part dies, >mod wire around it and keep thermally cycling. A: Mod wiring results in a disturbed test due to handling--you no longer know what you got; this is very labor intensive; and X needs to be 32 or larger. >2) Have Y multiple component series circuits and when one part dies the >circuit is then not considered any longer. A: Y needs to be 32 or larger; and things get statistically very messy. >3) Have 10 components, each as a separate circuit. A: You need to expand 10 to 32; or internally quarter each component into separate identical daisy-chains; otherwise this is not statistically robust enough.. Werner Engelmaier --------------------------------------------------------------------------------- Technet Mail List provided as a free 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/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------