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January 2016

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Subject:
From:
Toby Carrier <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Toby Carrier <[log in to unmask]>
Date:
Wed, 13 Jan 2016 14:36:25 -0500
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Victor,

Is the hipot failing when testing line/neutral to chassis ground, or
between grounds? How long are you running the test and at what voltage
level are you running it? Depending on where you are testing is where it
can be one of many items. If you are testing from line/neutral to ground
for 1 sec (production testing), and the unit fails, then there can be a
lead or trace to close to the chassis, or two leads close to each other
violating the clearance distance. If you are running the test for 1 minute
(design testing) on a production unit, then you could be triggering the
protection devices within the power supply.

There are other scenarios based on the design of the supply and application
of the high voltage.

Thanks,
Toby Carrier, CID

On Wed, Jan 13, 2016 at 10:05 AM, Victor Hernandez <
[log in to unmask]> wrote:

> 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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______________________________________________________________________
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Toby

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