Rich,
We have always preferred the AC test in manufacturing, as we felt it was a
better test. However some technical issues, not safety related, have come
up that caused one of the development teams to request investigating using
the DC test for the routine manufacturing test.
Thanks,
Gregory
-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Dual polarity DC electric strength test
Hi Greg:
The standard is incorrect in requiring tests of both polarity d.c. There is no
physical rationale for both polarities. But, at this time, if you opt for d.c.
testing, you must test with both
: EMC-PSTC@LISTSERV.IEEE.ORGReply To: Charlie BlackhamSubject: Re: [PSES] Dual polarity DC electric strength test
Rich
The standard is incorrect in requiring tests of both polarity d.c. There is no physical rationale for both polarities.
Go on, I’ll bite
J
What’s this requirement doing
in the standard then? Regards Charlie From: Richard Nute
[mailto:ri...@ieee.org]
Sent: 04 August 2015 19:09
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Dual polarity DC electric strength test Hi Greg:
The standard is incorrect in requiring tests of both polarity d.c
this requirement doing in the standard then?
Regards
Charlie
From: Richard Nute [mailto:ri...@ieee.org]
Sent: 04 August 2015 19:09
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Dual polarity DC electric strength test
Hi Greg:
The standard is incorrect in requiring tests
Hi Charlie:
The standard is incorrect in requiring tests of both polarity d.c. There is
no physical rationale for both polarities.
Go on, I’ll bite :)
What’s this requirement doing in the standard then?
Because it appears in IEC 60664-1, sub-clause 6.1.2.2.2.3.
Actually, discharges involving insulators appear to be polarity
senstive from recently published data. I have confirmed this with lab
measurements. Not sure how this effects safety.
Doug
On Wed, 5 Aug 2015 11:52:06 -0700, Richard Nute wrote:
Hi Charlie:
The standard is
In message 20150805123657.7o15cirvwgwkw...@hostingemail.xo.com, dated
Wed, 5 Aug 2015, Doug Smith d...@emcesd.com writes:
Actually, discharges involving insulators appear to be polarity
senstive from recently published data. I have confirmed this with lab
measurements. Not sure how this
Hi John and the group,
Thanks! The data I saw is in a paper that was submitted to the EMC
Symposium in Dresden and left me with the impression it was new. Having
read the paper, I set up an experiment in the lab and true enough, the
discharge current onto an insulator (amps for ns or so) is
In message 20150805142422.uhqgeaxlc8sk8...@hostingemail.xo.com, dated
Wed, 5 Aug 2015, Doug Smith d...@emcesd.com writes:
I set up an experiment in the lab and true enough, the discharge
current onto an insulator (amps for ns or so) is quite different for -
and + discharges, much greater for
In message
caoqwfnow81oqpqgzv4n1d1vqbjs-d88t+6uowt-q8f6cl8c...@mail.gmail.com,
dated Tue, 4 Aug 2015, Greg McClure gmccl...@lexmark.com writes:
The equipment we have in our lab only provides a single polarity,
positive with respect to ground when in DC mode, which requires us to
manually
All,
In reviewing IEC 62368-1 Clause 5.4.9.1 the test procedure states about
halfway down the page:
The insulation is subjected to the highest test voltage as follows:
- by applying an a.c. voltage of substantially sine-wave form having a
frequency of 50 Hz or 60 Hz; or
- by applying a d.c.
Doug, John,
We have discussed these options with our test equipment group and could
build the test fixtures as suggested. However, we hesitate to use a
reversing scheme with a switch or high voltage relay in manufacturing
because it would require making the chassis of the product hot for one
It would seem that you need a piece of test gear with a floating output that can have either end referenced. Not sure I have seen anything like this.Best, Doug.
Hi Greg:
The standard is incorrect in requiring tests of both polarity d.c. There is no
physical rationale for both polarities. But, at this time, if you opt for d.c.
testing, you must test with both polarities. I would advise testing with a.c.
to avoid capital expense of a new
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Dual polarity DC electric strength test
It would seem that you need a piece of test gear with a floating output that
can have either end referenced. Not sure I have seen anything like this.
Best, Doug.
From: Greg McClure
Sent: Tuesday, August
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