Jim, as I see it, EFT and Surge are not a whole lot different except
for the amount of power in the surge pulses. Surge is pretty much a
test of the power supply's ability to handle the power and not pass it
to the secondary circuitry. I believe that a good line filter coupled
with the use of a power supply that also has a CE mark and has passed
surge testing constitutes a pretty good design and hence my comments
about reciprocity between low emissions and high immunity resistance.
We did have experience with one switching power supply which failed
surge testing where the design folks decided to forego the line filter
for cost reasons. I hate that, because it usually means we spend more
money solving the failure issues over what the savings are in the
design. The fix required the power supply manufacturer to put a sleeve
over one set of windings which was arcing, the cost of which was passed
on to us since it was a special, so to speak. There were no signal
integrity issues.
Warren Birmingham
Epsilon-Mu Consultants
On Tuesday, Sep 24, 2002, at 10:32 US/Pacific, Jim Eichner wrote:
Thanks to all who have responded so far. One note of clarification:
we are
already set up for doing ESD testing in-house, and I agree that's
where most
of our failures will happen. I also agree that much of the immunity
suite
will take care of itself on a well designed unit that has low
emissions, but
I don't think that's true with surge. Maybe EFT, but not surge.
Note: please refrain from replying both to me and to the forum - you
only
need to reply to the forum. I suspect some, but by no means all, of
our
"double-posting" complaints stem from people sending 2 replies.
Having said
that, I am getting 3 of everything this morning!
Thanks,
Jim Eichner, P.Eng.
Regulatory Compliance Manager
Xantrex Technology Inc.
e-mail: jim.eich...@xantrex.com
web: www.xantrex.com
Any opinions expressed are those of my invisible friend, who really
exists.
Honest. No really.
Confidentiality Notice: This email message, including any attachments,
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-----Original Message-----
From: Jim Eichner [mailto:jim.eich...@xantrex.com]
Sent: Monday, September 23, 2002 2:45 PM
To: 'EMC-PSTC - forum'
Subject: Surge and EFT test equipment for AC, DC, and signal ports
We are starting to look into the costs and issues around gearing up
for
some immunity testing, with the intent of determining whether or not
it is
too hard or too expensive to gear up to do some of it "at home". We
are
not looking for final formal compliance results here, only for
pre-compliance peace of mind. In particular, I need to consider the
following:
1. EFT (EN61000-4-4) - AC input, output, and ground lines, DC input
and
output lines, signal/control lines
2. Surges (EN 61000-4-5) - AC input, output, and ground lines, DC
input
and output lines, signal/control lines
3. Surges (SAE J1113/11) on DC power leads
4. Fast transients (SAE J1113/12) on other than power leads
The products which we hope to be able to test in-house are power
conversion and control products, and have a wide range of input/output
voltages and power:
- AC inputs up to 120V, 60A, or 230Vac, 30A single-phase, 120/240V,
50A,
split-phase, and 120/208V, 30A, 3-phase
- AC outputs up to 120Vac, 60A, 230Vac, 30A, 120/240V, 50A split-phase
- DC inputs up to 12V, 500A; 24V, 300A; 48V, 200A
- DC outputs up to 12kW at 10 - 600Vdc (1200A - 20A)
Questions:
1. Is there any single piece of equipment (with
accessories/modules/etc.)
available that can do both Surge and EFT tests on equipment, or are
these
tests just too different?
2. Surge - Is there any single piece of equipment (with
accessories/modules/etc.) available that can do surges on all these
types
of ports: AC and DC and signal/control? Any info re mfr, cat. no.,
price,
etc. would be appreciated.
3. EFT - Is there any single piece of equipment (with
accessories/modules/etc.) available that can do EFT on all these
types of
ports: AC and DC and signal/control? Any info re mfr, cat. no.,
price,
etc. would be appreciated.
4. Do these tests have to be run at full output (which may limit my
ability to find 3rd party labs with suitable equipment, let alone
gear up
in-house) or can they be run with a light load on the equipment and
then
test full output after each test to confirm return to normal
operation?
Thanks in advance for your help,
Jim Eichner, P.Eng.
Regulatory Compliance Manager
Xantrex Technology Inc.
e-mail: jim.eich...@xantrex.com
web: www.xantrex.com
Any opinions expressed are those of my invisible friend, who really
exists. Honest. No, really.
Confidentiality Notice: This email message, including any
attachments, is
for the sole use of the intended recipient(s) and may contain
confidential
and privileged information. Any unauthorized review, use, disclosure
or
distribution is prohibited. If you are not the intended recipient,
please
contact the sender by reply e-mail and destroy all copies of the
original
message.
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