Hi Dan:
Thank you for giving us straight answers and helping us
to overcome the conventional wisdom about fuses.
Several years ago, I put together an article addressing
fuses, their operation, and how to select the fuse rating.
See:
http://www.ewh.ieee.org/soc/emcs/pstc/psn/
Then,
Can anyone provide me with guidance on how to import unfinished goods to the
US. The product is a Telco attached digital device so FCC Parts 15 and 68
apply. The plan is to import the product with out any labeling. Before the
product is shipped to the customer it will be programmed with a
Dan I agree in general with your comments. I will go so far as to stipulate
many design engineers don't know their hole from an ass in the ground as far
as properly specifying fuses. That being said the fuse industry has a problem.
I have seen many, genuinely defective fuses. I have seen even
So is mine (hand up, that is)
Best Regards,
Michael Hopkins
Manager, EMC Technologies
Thermo Electron
Control Technology Division
EMC ESD Simulation Systems
One Lowell Research Center
Lowell, MA 01852
Tel: +1 978 275 0800 ext. 334
Fax: +1 978 275 0850
michael.hopk...@thermo.com
One
I can't confirm or deny the requirement, but I wouldn't say it's a bad idea.
Often, fire suppression systems can be assisted by shutting off airflow.
Chemical or biological agents, when used, will likely target the air
handling system, for maximum effectiveness. It wouldn't save a building
from
Dan,
So far there hasn't been mention of the mechanical stress aspect of fuse
failure related to the fuse wire breaking because of repeated cycling of
power. I have personally seen this happen at a commercial daytime radio
station. It took over a year for a properly rated fuse to blow because
SBC has a new issue of their NEBS document TP76200 on their web site:
https://ebiznet.sbc.com/sbcnebs/
You can also find a link to it and other RBOC checklists at:
http://nebs-faq.com/do_the_rbocs_have_requirements_over.htm
Of note is SBC’s acceptance of ANSI/T1.319-2002 for Fire
As a fuse manufacturer, I have read all the e-mail on this subject with great
interest. Unfortunately, many responses emphasize common misunderstandings.
In the fuse industry, there is no such thing as a Bad fuse. The chain of
e-mails clearly indicate why we avoid this word due to its various
To all interested parties:
The presentation slides from our May 13th meeting:
Signal Integrity/EMI Challenges Design Solutions - A Seminar
is now available for download from our website at
http://www.ieee.org/rmcemc
Thank you
Best Regards
Charles Grasso
Senior Compliance Engineer
Echostar
I read in !emc-pstc that Pettit, Ghery ghery.pet...@intel.com wrote
(in 42050df556283a4d977b111eb7063208138...@orsmsx407.jf.intel.com)
about 'Harmonics and conducted emissions' on Tue, 27 May 2003:
EN 61000-3-2, by definition, is unhelpful. End of editorial comment.
That's a bit harsh. IEC/EN
This seems to be a problem of semantics. In the case of a fuse, a failure
is a success - the fuse succeeded in protecting the circuit (neglecting the
cases where the fuse failed to do its job, discussed elsewhere).
I clearly recall some ads for Timken Steel in the 1960s which discussed the
My hand is up.
David Pommerenke
From: Luke Turnbull [mailto:luke.turnb...@trw.com]
Sent: Tuesday, May 27, 2003 8:23 AM
To: emc-p...@ieee.org
Subject: ESD Problem
Would the gentleman who is on the 61000-4-2 committee please put his
hand up?
Thanks,
Luke Turnbull
This message is from
Neil,
The out of band emissions below 150 kHz are nothing new. I remember
having this problem when testing to the old German standards that had us
performing power line conducted emissions tests down to 9 kHz. The
noise off the input rectifiers would saturate the front end of a
spectrum
Would the gentleman who is on the 61000-4-2 committee please put his hand up?
Thanks,
Luke Turnbull
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.
Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/
To cancel your
Neil Helsby wrote:
Has anyone else noticed the tendency of modern switch mode power supply
designers to save manufacturing costs at the expense of harmonic and
conducted emissions measurements?
It's not modern. I ran into it in the 1980's. Saving costs isn't _bad_,
mind; it's simply doing
I read in !emc-pstc that Neil Helsby nei...@solid-state-logic.com
wrote (in 20030527.10334...@mis.configured.host) about 'Harmonics and
conducted emissions' on Tue, 27 May 2003:
Has anyone else noticed the tendency of modern switch mode power supply
designers to save manufacturing costs at the
I read in !emc-pstc that Hudson, Alan alan.hud...@amsjv.com wrote (in
c432a75247b8f84d86febc5425b6a552087...@amsms01001.jupiterlnk.net)
about 'VG95373 - advice needed' on Tue, 27 May 2003:
(I
suppose I'm asking that if a cabinet meets VG95373 will it pass the EN
standard equivalent(s) and I can
Has anyone else noticed the tendency of modern switch mode power supply
designers to save manufacturing costs at the expense of harmonic and
conducted emissions measurements?
EN 61000-3-2:2000 has introduced the concept of Partial Odd Harmonics for the
21st and above. While this adds extra
Hello Alan,
There is no EN standard covering the same subject as this German Military
standard, full title:
VG 95373-15, Electromagnetic Compatibility-Electromagnetic Compatibility of
Equipment-Part 15: Test Method for Coupling and Screening, Germany,
February 1997.
VG 95373 Part 15. This
G'Day!
Does anyone in this collective have working knowledge of a German defence
standard - VG95373 Part 15?
I'm been offered a cabinet which, for EMC matters, the manufacturer states
meets VG95373 part 15. I don't really want to buy a standard (and spend
hours studying it) for the sake of a
I read in !emc-pstc that richhug...@aol.com wrote (in 095A00F3.5FF82361
.0ba45...@aol.com) about 'Bad Fuse vs. Good Fuse' on Mon, 26 May 2003:
It could
be that the faulty components that John Woodgate mentioned fall into this
category.
The epidemic failures were undoubtedly due to manufacturing
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