Never had to do that bulk current injection test (except some NEBS GR-1089
stuff). Is it with modulated RF, or merely
swept? Keying on and off can be much more severe in its effect than a
continuous carrier, or a gradual increase and
decrease with sweeping frequencies as cables resonate.
Cortla
I read in !emc-pstc that Rich Nute wrote (in
<200201102027.maa26...@epgc264.sdd.hp.com>) about 'Switch Inrush
Ratings', on Thu, 10 Jan 2002:
>Taking John Woodgate's usual response to such
>an inquiry, I did a Google search on "inrush."
I don't think I use that response any more often than others
In a closer-to-safety example, I've seen mobile radio affect screening devices
at a courthouse doorway
(I was parking for jury duty). Key down; lights up. Key up, works normally (40
meter band, about 10
meters away).
I've seen a poorly wired burglar alarm go off 30 meters from my car when I was
Yes Ken, I agree.
My humor only provided a grain of truth. Thanks for providing the whole
pound :-)
Chris Maxwell | Design Engineer - Optical Division
email chris.maxw...@nettest.com | dir +1 315 266 5128 | fax +1 315 797
8024
NetTest | 6 Rhoads Drive, Utica, NY 13502 | USA
web www.nettest.c
A lot of humor is based on a deliberate misinterpretation of a common phrase
or common wisdom. "Take my wife, PLEASE," Or the cute stress relief advice
I got the other day. "To relieve a headache, fetch a bottle of aspirin and
follow the directions: Take two aspirin and keep away from children.
There will be NO compatibility issues between the two equipments you posit
over the frequency range of the immunity/emission tests. The fields do not
scale as you suggest. What you suggest is a worst case and you will
encounter no problem with such a separation as you calculate, but it is
TOTALL
That's interesting!! (See Cortland's message below)
We as manufacturers have CENELEC and the FCC breathing down our neck
over a few dBuV/m.
We have the IEEE EMC and Functional Safety paper, all 50 some pages of
it, worried about the possibly catastrophic effects of a Palm Pilot next
to a crock
I have a little different experience than the other respondents to date, who
pretty much said no extrapolation is possible from one band to another.
My experience and analytical training tell me that if field intensity and
modulation are held constant, then above 1 GHz coupling to wires running
b
I belive emissions standards were designed to allow proper operation of radios
and televisions with minimal irritation. This would include sound and video
quality. I heard this story a long time ago with respect to FCC limits.
On the other hand, immunity standards were developed so equipment wo
Taking John Woodgate's usual response to such
an inquiry, I did a Google search on "inrush."
Surprisingly (to me), there is a wealth of
reasonably good info on the web under the subject
of "inrush," including switches rated for inrush
current.
Best regards,
Rich
---
If I assume that the top loaded antenna acts as a quarter wave stub, that is
it is extremely efficient at radiating all the power presented at the base
and not reflecting any back, and if I further assume this is CB band or
higher (essentially at or above 30 MHz), then 600 Watts 5 meters away (one
Duncan,
You might want to get all the info you can get on
contact ratings for mechanical relays and contactors.
Then, use that information by analogy.
DC operation of a switch is the more destructive by
orders of magnitude than AC operation. Since the
normal cycle of AC will quench any s
I read in !emc-pstc that Veit, Andy wrote (in
<421e2204a588d111b8bf00a0c995f26801be9...@smtpgate.mts.com>) about
'radar', on Thu, 10 Jan 2002:
>I can think of at least one good reason to take a RHD car out of the UK -
>its called the Lotus Super 7.
>There, its out in the open now. I am a Britis
A worst case -- "real world" -- is probably just behind a radio equipped car,
mounting a capacitively top-loaded
antenna at its rear edge, and about 600 watts of RF.
With rather less power, 100 watts, I've occasionally seen adjacent cars'
engines stop when I transmit. It would be
interesting to
To all,
I have left my post as Business Development Manager of Flextronics and have
taken on the position of Southeast Area Manager for TUV Rheinland of N.A.
If you need to contact me, my new information is below.
Bill Ronzio
Southeast Area Manager
TUV Rheinland of N.A., Inc.
762 Park Avenue
I have to agree with Peter - just because it passes in one band doesn't mean
it
will pass in another. For argument's sake in one instance, consider the loop
area
of a signal and it's return - it's effective at specific
frequencies/frequency bands.
Also consider why the new standard(s) added the h
From: Douglas Beckwith@MITEL on 01/10/2002 11:17 AM
Aha, a man after my own heart. Now you are talking about real cars. As an ex
South African living in Canada, I still can't get used to the idea of driving on
the the wrong side of the road.
Doug Beckwith
"Veit, Andy" on 01/10/2002 08:29
Interesting - What was intended to be a humorous remark actually
received some serious response!
John
-Original Message-
From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Veit, Andy
Sent: Thursday, January 10, 2002 5:29 AM
To: emc-p...@majord
Try putting a mobile phone next to your computer mouse! Even more fun if the
computer has speakers!
Peter
-Original Message-
From: ari.honk...@nokia.com [mailto:ari.honk...@nokia.com]
Sent: Thursday, January 10, 2002 1:23 PM
To: am...@westin-emission.no
Cc: emc-p...@majordomo.ieee.org
Sub
Keith,
I thought of you because of previous statements that the automotive industry
wasn't testing hard enough and this seemed to me a counter-example of
massive unjustified overkill. My apologies, in the future I will only
respond to direct postings.
Ken Javor
on 1/10/02 8:52 AM, cherryclo...@
This is a response not only to Scott's message, but also in particular to
Michael Sundstrom who wrote in a different posting, "...you might have V rms
but not V/m in conducted immunity testing."
Conducted immunity testing of the bulk current injection or IEC 1000-4-6
type is a lumped element mode
I have been 'hardening' headsets and amplifiers to meet the 80 to 1000MHz,
1KHz 80% AM modulation requirements in EN55024, 3V/m. As our product lives
on peoples desks we undertook to also provide immunity to mobile phones. We
covered 900MHz, 1.8GHZ, 1.9GHz and 2.45GHz switched key modulation at 200
Dear Ken
I have no problem with "The unalterable physics of field-to-wire coupling".
But I am concerned to ensure that basic physics is correctly applied in
engineering issues.
Can I please ask you to place any criticisms of me in the threads I am
contributing to, or send them directly to me, no
>Why would someone want to take a car out of UK with the
>steering wheel on the wrong side?
I can think of at least one good reason to take a RHD car out of the UK -
its called the Lotus Super 7.
There, its out in the open now. I am a British car nut. :)
Rerards,
Andrew Veit
Systems Design Eng
Hi,
today I heard about a case where an ISDN terminal was susceptible to a
DECT phone next to it while a 900 MHz GSM did not cause anything. This
was in the field, not in test lab.
In test lab my experience is that if it passes below 1 G it does it also
above it.
However, as the 1.4-2 GHz sweep ta
Imagine that, holding someone accountable for their own actions!
What a novel concept.
I doubt it would ever be accepted in the US.
MOO
"J.Feldhaar" on 01/10/2002
08:00:52 AM
Please respond to "J.Feldhaar"
To: "Price, Ed" ,
emc-pstc%majordomo.ieee@interlock.lexmark.com
cc:
Ken and others,
Yes, we have witnessed some very interesting deviations (as you may guess)
in product performance due to the intense RF Fields/Currents seen during
testing. Our designs are impacted by this test on a regular basis. We
would definitely entertain the idea of making the requirement
Hi Ed,
in Germany you have speed ratings for your tires, beginning at 160 KPH
(100 mph)and then on to 190, 220 and 250 and beyond (some cars really go
that fast, take a Porsche or a Ferrari). BMW and Mercedes have a
"gentleman agreement" that these cars can't exceed 250 KPH (abt 156
mph).
But of
RF immunity testing in the frequency range 80-1000MHz has been common in EU
for several years. Now, new standards also include testing in the 1-2GHz
band (3V/M or 10V/m, 1kHz sine, 80% AM)
We have done a lot of testing in the 80-1000MHz band and quite often the
EUTs failed. We have also done some
Darren
Please look at www.int-app.tuv.com.
Best regards
Glenn Moffat
TUV International UK
Tel: +44 121 634 8000
Fax: +44 121 634 8080
Hi every one,
I am currently trying to get a radio device approved in China,
Can any one tell me who the authority is in China, or help with a contact
e mail
Hi Folks.
At the moment I'm examining as a generic case, the potential for
interference with Item A (tested to comply with 3V/m radiated immunity)
caused by Item B (tested to comply with FCC or EN Class A [industrial]
emissions).
Using simple inverse distance ( E2 = E1 x d1/d2 ) extrapolation (a
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