Can anyone explain the reason(s) if you get minimal intermittent Hi-Pot failures (850 VDC, * 2 sec) on one UUT? Hi-Pot was done on isolated componentry and passed, and when tested as a whole unit, failure occurs intermittently (roughly 1 out of 15 times). The failure occurs just about when the voltage begins to drop back to zero, however the Hi-Pot tester doesn't indicate any leakage current. Lester --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d 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 delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail 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 ---------------------------------------------------------------------------------