Have you located the site that is leaking? If not you need to. Can you adjust the tester to abort tests based on leakage? Most commercial testers can be adjusted so that you will not see or hear corona discharge. The tester simply shuts down before there is enough current. This is good because it is safe. First find the lowest voltage that the system will pass. You test at 3000 V. Will the system pass 1000 V? fail 1200 V then use 1200 V for the following. Take the tester and a board into a darkened room. and repeat the test slowly increasing the allowed current. Make these adjustments slowly as the line between a low current corona and a big-ass arc is very fine. At the break point you will hear a hissing sound. Look for a colored light at the site. This is where the system is failing the test. I have seen capacitors, board defects, damaged inductors, transformers and EMI filters as the root cause. I have not seen flux cause a Hipot failure. But there is a first time for everything. Guy Ramsey Senior Lab Technician / Instructor E-Mail: [log in to unmask] <mailto:[log in to unmask]> Ph: (610) 362-1200 x107 Fax: (610) 362-1290 -----Original Message----- From: TechNet [mailto:[log in to unmask]]On Behalf Of PL Sent: Friday, August 31, 2001 1:48 PM To: [log in to unmask] Subject: Re: [TN] Hi-pot test Hello, Does anyone have experience in determining the root causes for hi-pot test failures? I am especially interested in the effect of flux residues remaining from no-clean hand soldering. The DUTs are being screened with a 3KV, 10sec hi-pot tester. So far my results are inconclusive as to whether the flux seen on the board has any influence on the test results. Rgds, Peter _________________________________________________________ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.com ---------------------------------------------------------------------------- ----- 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 ---------------------------------------------------------------------------- ----- --------------------------------------------------------------------------------- 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 ---------------------------------------------------------------------------------