GFI is protection for currents going where they are not supposed to go.  I believe the HiPot testers are DC, but it has been so many years since I've used one that I'm not sure.  AC GFI often has trouble due to bypass capacitors--hospital grade equipment has a very tight spec on this, so any power supply bypass which has a path to earth ground has to be minimized.  But with DC, there has to be resistive paths opening up at the higher voltages.  These can be due to surface contamination or inadequate isolation of the part being tested from earth ground.

What are you measuring?  A cable?

Wayne Thayer

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Michael Strong
Sent: Friday, June 07, 2013 11:17 AM
To: [log in to unmask]
Subject: [TN] Hipot Testing

Wondering if I can pick the brain of somebody out there.  When performing Dielectric strength testing most of my failures are the result of a GFI.  I can turn this feature off on my instrument and was wondering if most people who do this testing do the same.  I know this is a safety feature but I'm trying to find a more standardized way of doing this test.  What are the likely consequences of turning this feature off?  Any advice would be appreciated.



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