Steve / Dave,
Try the Associated Research website for good info on hipotting. I suspect
you could even fire a question to their support staff via the site about
your specific situation. They've been in the business for a long time and
have quite a good set of "white papers" on dielectric testing. That being
said, I'm not advocating or advertising their products in any way over
another company's. I have simply had good experiences with their equipment
and support staff in "a former life" like you Dave...
Link: http://www.asresearch.com/
Dale Ritzen
Quality Manager
Austin Manufacturing Services
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Roach, David
Sent: Tuesday, February 07, 2006 3:01 PM
To: [log in to unmask]
Subject: Re: [TN] Hi voltage testing
Steve, the dielectric test is often called a hipot test (high potential). I
have very limited experience with these in a former life. Your stated test
requirement of 500 VDC makes sense to me, but the 5000 ohms does not.
Normally, a hipot test is run by applying a voltage, usually starting at
zero and ramping up to the required test voltage, and checking for current
leaking to ground or another conductor. The tester will shut down if
leakage current is detected, and will tell you the voltage that the failure
occurred at. If no leakage current was detected up to the specified
voltage, the hipot test passed. If a hipot test fails once on a specimen,
it will usually fail again next time at a lower voltage because you get some
carbon arcing at the point of failure, which reduces the dielectric
strength. On products I have worked with, 100% hipot testing was done as a
UL requirement. This was on commercial food warmers and cookers.
You should be able to find more information and manufacturers of hipot
testers by searching the Internet for hipot tester. You might even find a
hipot tester on eBay as someone's industrial surplus.
Dave Roach
Trane GCC
4833 White Bear Parkway
St. Paul, Minnesota 55110
651-407-4294
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Kelly
Sent: Tuesday, February 07, 2006 2:22 PM
To: [log in to unmask]
Subject: [TN] Hi voltage testing
Fellow Technetters,
We have been asked by a customer to do a dielectric withstanding voltage
on a flex circuit. The requirement is 500Vdc at 5000 ohms. I have a
couple of questions: 1) who supplies such equipment and 2) I am under
the impression they want this on every net on every circuit - isn't this
normally some coupon or AQL basis? Thanks in advance. Regards Steve
Kelly
Steve Kelly
PH: (416) 750-8433
FAX: (416) 750-0016
CELL: (416) 577-8433
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