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February 2006

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Subject:
From:
"Dehoyos, Ramon" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Dehoyos, Ramon
Date:
Tue, 7 Feb 2006 16:32:56 -0500
Content-Type:
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        Hi Steve:
        I supposed some sophisticated Hi-Pot testers have a variable
series resistor so that 5000 ohms can be selected to create a potential
100 mili-amp current through the board. I believe most are set in the
mega ohms range to allow very little current through in case of a leak
or breakdown.
        Regards,
        Ramon


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Roach, David
Sent: Tuesday, February 07, 2006 4:01 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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