Hi Doug:
I think that we hold different definitions for "breakdown."
In safety, "breakdown" signifies
1. failure of solid insulation (in ohms) to withstand the test voltage
(for one minute), or
2. an arc through air insulation at a voltage less than the test
voltage.
In both cases, a hi-pot tester would trip, regardless of current setting.
The failure of solid insulation can be verified by an ohmmeter (which, if
good, would be near the upper limit of the ohmmeter).
Your measurements do not appear to comprise a safety-related breakdown.
The question I have is: What is the ohmmeter measurement before and after
the pulse test? Well. we don't know the "before" measurement. But, an
"after" measurement should indicate whether or not damage to solid
insulation has occurred (resistance is less than 5 megohms - say). Or, a
leakage current test.
Another question: Why did you choose to do the pulse test with the
equipment under test not powered on?
Best regards,
Rich
From: doug emcesd.com <d...@emcesd.com>
Sent: Thursday, February 27, 2025 6:30 PM
To: ri...@ieee.org; EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] major safety issue possibly affecting 20% of the
electronic devices in use
Thanks for the information. But in this case breakdown is occurring and the
question is if it can be problematic.
Doug Smith
Sent from my iPhone
IPhone: 408-858-4528
Office: 702-570-6108
Email: d...@dsmith.org <mailto:d...@dsmith.org>
Website: http://dsmith.org
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