Perform the HiPot test in a dark room, slowly (and carefully) looking for visible glow before onset of the leakage-limit event.  This may help you to visually locate the area of the breakdown.  If it is not visible on any exterior surfaces, you will have to disconnect various "HV barrier" components to determine which one is breaking down internally.


Carl B. Van Wormer, P.E., AE7GD
Senior Hardware Engineer
Cipher Engineering LLC
    21195 NW Evergreen Pkwy Ste 209
    Hillsboro, OR  97124-7167
    503-617-7447x303
    [log in to unmask]     http://cipherengineering.com



-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor Hernandez
Sent: Wednesday, January 13, 2016 7:06 AM
To: [log in to unmask]
Subject: [TN] Post HiPot Testing, Power Supply leakage failure

Fellow TechNetters:

   What type of failure mechanism is associated with a HiPot Test Failure on a 750W Switching Power supply?   The visual did not turn up any damage to components exterior structure.   No damage to PWB laminate and solder mash surface.

Victor,


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