I 'm afraid that my response to Neven's comments concerning EFT might have
sounded like I didn't approve of his method. Far from it, I think his method
is sound. I added my comments about component value selection as an aside.
Keep up the good work.
Dave Cuthbert
Micron Technology
Hi Folks,
My manager wants to attend an EMC seminar for compliance managers. He is
not an EMC person and doesn't want to know all the technical details. I
remember Univ. of Wisconcin offered such seminar before. Andway, any
recommendation are appreciated. Details such as an URL is prefered.
We use two dome cameras: one is mounted closer to the antenna on the left
side, the other is closer to the EUT on the right side. We set up the EUT
so the indicator is visible in x, y and z axis orientations. Fault
indication can be wired to external LEDs if necessary.
Of course, alarm
Herr Stolle hat Recht.
Lfd. Nr. = 'laufende Nummer' - Brockhaus Bildwöterbuch, 1960 McGraw-Hill
A 'laufende Nummer' is litterally a 'running number', hence a serial number.
David
From: Thomas Stolle [mailto:off...@tstolle.in-berlin.de]
Sent: Friday, January 17, 2003 5:54 AM
To:
This is a multi-part message in MIME format.
Attached is an article from the Conformity 2002 Annual Guide titled Know
When You Need To List Your Product And When You Don't written by John
Curtis of Curtis- Strauss LLC. It gives some great information. For those
who, rightfully, fear attachments,
I use off-the-shelf dome surveillance cameras with an x-y-z+zoom controller in
the chamber at 20 V/m. Smoke covers are available for the camera mechanism.
Contact me off-line for model numbers. We turn the cameras off during
emissions measurements. Our antenna-EUT axis is somewhat diagonal;
This is partially true in that while the there are some EU standards
harmonized with UL standards, they are not completely harmonized and you
still have to consider the U.S. National Deviations to be totally complaint
a good example is component approvals. The UL standard will usually require
a
Amund,
I think early on you mentioned that you didn't want to be restricted
where
you could sell. So if that's the bottom line then I think its off the NRTL you
go. Even given the single condition of the City of LA which not only requires
it (or a City of LA inspection where they claim
Hi Dave,
You are not correct when you stated that UL60950 is the same as EN60950.
Actually, both of these
standards are based on IEC60950, but they are not equal to each other. Each
has specific national
deviations from IEC60950 that must be addressed if a product is to be
successfully
Amund,
Several EU standards have been harmonized with the United States UL
standards. A list can be found at
http://ulstandardsinfonet.ul.com/catalog/stdscatframe.html
For example, UL 60950 the same as EN 60950. So, I'm thinking that if your
device meets EU safety requirements it will make it
Hi All,
I can't resist throwing in my 2 cents worth as well. EFT has a pretty
steep risetime of current, not quite as fast as ESD but fast enough to
cause interesting effects. An EFT generator can produce 100 volts of
di/dt across one cm of wire! (a Faraday voltage measurement, see
I agree. In fact it is no engineering at all. Cut and try is no engineering
either.
On the subject of adding caps in circuits for noise immunity. Rather than
just throwing in a value of 0.1 uF, finding it works, and calling it good I
like to use a different approach. Determine the lowest
I applaud your approach to finding a proper value for production devices.
By contrast, when I was a teen, I studied some schematics, but knew almost no
theory and could read color codes only up to 5. I built several successful
tube type AM transmitters using second hand components. I used
Hello Rob,
If IDA used the term license, they may be referring to something other
than equipment type approval. They could be referring to a dealer's license
for your local supplier in Singapore. It could also be a radio license --
depending on the equipment we're talking about.
If you want
Another option is to use contiguous sleeving and clamps
whose mounting features do not require penetrating the
sleeving.
Regards,
Peter L. Tarver, PE
Product Safety Manager
Sanmina-SCI Homologation Services
San Jose, CA
peter.tar...@sanmina-sci.com
From: don_borow...@selinc.com
Sent:
I would never dare to declare U.S. compliance without testing and certify
via a NRTL. But what I am struggling with, is to gain knowledge about the
basic electrical safety laws in U.S. Maybe I do not need legally to go
through a NRTL, but that does not mean I would, even if I could.
The
On the subject of adding caps in circuits for noise immunity. Rather than
just throwing in a value of 0.1 uF, finding it works, and calling it good I
like to use a different approach. Determine the lowest value that will fix
the immunity problem. Then find the largest value that will still allow
Hello,
I am looking get a copy of
YD/T993: Technical Requirements and Test Methods of Lightening
Resistibility for Telecommunication Terminal Equipment
or preferably an equivalent document in English.
Do you know where I might be able to locate this?
Thanks,
Mat
Mat Aschenberg
Agency
I assume this is an off line switcher. If so, the FET is at mains potential
and the required creepage and clearance distances is the same as the
hot-to-ground creepage requirement(4 mm or is it 3 mm? for creepage).
I would not use the chassis as a heatsink myself. Even dirt cheap PC power
If polymeric hardware can't handle the heat, one could use ceramic
hardware. I just received some product info from a company called Ceramco
www.ceramcoceramics.com that among other things produces a line of
ceramic nuts, bolts and washers.
Don Borowski
Schweitzer Engineering Labs
Pullman, WA
Betreff: Re: [OT]: Help with German Industrial Abbreviations
Datum: Fri, 17 Jan 2003 11:31:25 +
Von: Jochen Feldhaar j.feldh...@telejet.de
Firma: Telejet GmbH
An: brian_ku...@leco.com
Referenzen: tfsag...@leco.com
Hi all,
Werk Nr. means Series Number, Lfd. Nr. means Serial number
I read in !emc-pstc that Amund Westin am...@westin-emission.no wrote
(in lfenjlpmmjbmhpeibnilaeapckaa.am...@westin-emission.no) about 'SV:
NRTL in the U.S.' on Fri, 17 Jan 2003:
Just for a few seconds forget the customers requirements, is it therefore a
correct interpretation that electrical
Vic -
Your assumption that at least Basic insulation is required
is correct. However, creepage distances are based on rms
voltages, not peak.
The below assumes that the voltages you mentioned are
present on the heatsink of the FET.
Assuming that a true rms meter will indicate an rms voltage
IDA is the Singapore telecom type approval authority. IDA approvals are
required for equipment which connects directly to the public
telecommunications network. You will find links to Type Approval regulatory
bodies, worldwide, including IDA on this website:
http://www.patton-assoc.com/
I am finding EMC Laboratory in Indonesia and Vietnam area.
Also,I know that it is in Philippines, Malaysia, Thailand and the India EMC
Test Laboratory,
I want to know level of service.
Hello Amund,
Unfortunately, your question can be broadly interpreted. As a matter of law
the U.S. has agencies (FCC, FDA) that require product approvals depending
on their intended use and function. Also, the U.S. has environmental laws
that are overseen by the Environmental Protection Agency
Visit www.ida.gov.sg or contact Colin Gan [mailto:colin@psbcorp.com]
He might help you with the details.
Amund
I have been advised by the Singapore authorities that I need to
get an IDA license .
What is it and how do I get one?
Thanks in anticipation
Click on browse
On Thu, 16 Jan 2003 08:29:14 -0800, Price, Ed ed.pr...@cubic.com
wrote:
I would like to ask if some of our list members, who are familiar with
German industrial marking practices, to help settle a discussion.
I am trying to determine the significance of markings on an auto radiator ID
plate.
Rob,
Your question is so wide ? for which product ?
You can start by visiting the IDA web site :
http://www.ida.gov.sg/Website/IDAhome.nsf/fFrame?OpenFormdoc=B85AF9D7D0
636A83C82568380032B0A8
good luck
Pierre-Marie Andre
From: Rob Humphrey [mailto:rob.humph...@reuters.com]
Sent:
I have been advised by the Singapore authorities that I need to get an IDA
license .
What is it and how do I get one?
Thanks in anticipation
Visit our Internet site at http://www.reuters.com
Get closer to the financial markets with Reuters Messaging - for more
information and to
Hi Safety folks,
Many good points in this discussion. For us up here in Scandinavia, we se
the U.S. market as one Market and we can not (may be we should..) go into
law details for the City of LA, Santa Clara County and so on.
If there are States or Cities in the U.S. which require by law that
Hi to you all,
We would appreciate your views please.
We drive a FET based H-bridge from rectified 230VAC mains; thus
320Vpk across the bridge. We have assumed the insulation between the
rectified power return and chassis (Class 1 product) is basic, thus
requiring 4mm
Hi All,
I just posted another paper from the 2002 EOS/ESD Symposium to my site
some of you may be interested in titled:
Electromagnetic Interference (EMI) Inside a Hard Disk Drive Due to
External ESD
It is the last item in the Technical Information and Downloads
section as well as a link
I have never worked on design of a product with external I2C bus, but
considering the bus speed of 100 kHz to 3.4 MHz (depending on type) relative
to
about 60-100 MHz BW (depending on definition) of EFT, you may try killing good
portion of EFT with ceramic caps.
Be sure that the cable shield
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