Hi Susan:
to my products. Is there a general guideline for separating traces to meet
isolation requirements and survive a 2000 VDC (input to chassis) hi-pot
requirement?
There are regs and there are rules of thumb and there are
physics...
...that govern the distance at which
I am trying to get a list of labs that can perform SAR testing on the West
Coast, (CA).
Thanks, Ron DENSO
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Actually it's to reduce interference to one's own equipment, (if it emits it
- it's also susceptible to it). It also has the effect of reducing
interference to other near by equipment.
Michael Sundstrom
Nokia Mobile Phones, PCC
EMC Technician
cube 4E : 390B
phone: 972-374-1462
mobile:
It's great being part of such a specialized forum and to have the resource
of members experience.
I need to know if there's a lab. or company as local to Dallas as possible
that can do material analysis on plastics to determine the compounds used.
Any feedback will be greatly appreciated.
I recall many messages regarding trace separation, etc. to meet certain
voltage isolation requirements; however, none of those specs are applicable
to my products. Is there a general guideline for separating traces to meet
isolation requirements and survive a 2000 VDC (input to chassis) hi-pot
So it took hot flaming oil to assess Rich's worth!
My personal respect and gratitude goes out to Rich because he does his own
empirical evaluations and tests, something that many of us either do not
bother to do or do not have the bandwidth to do because we are busy
pushing equipment out the
Hello Paolo, Group,
If any PC source creates a common mode current flowing through your LAN
card,
then into the UTP cable then this current will show up as conducted
emission.
Its not the data that radiates, it's noise from the PC board.
As soon as the LAN cable gets long enough, it will radiate
For what it's worth:
We bought a printer server made in France, it requires STP (shielded) cable for
CE compliance. We use it to test our 10/100 Ethernet ports. So at least one
French/EU entity believes in STP cable.
I also have a small 4 port 10/100 hub at home, it requires STP to pass. Uh,
Has anyone FCC tested a GPS device? Is there a special section in the 47
CFRs(FCC)?
Is 47 CFR 15 class B where I need to look?
Thanks, Ron, DENSO
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This message is from the IEEE EMC Society Product Safety
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Has anyone seen problems with ethernet and conducted emissions? I have a
home office with 4 PCs networked with ethernet running over UTP and I
haven't seen much of a problem.
Granted, the longest cable run I have is to a file server in the basement
(about 10 meters) but both my AM radio and my
For what it's worth, a modest amount of de-hacking revealed that:
www.rcic.com was one of several intended targets, according to the source code,
though no specific reason why RCIC was a target unless it is co-hosted at some
site the hacker attacked; or someone fed up with Euro Norms (ha ha).
A
Yes. It looks like the guy(?) has replaced the RCIC home page with his own,
but has a message to the system admin.
I suggest that Tom (or is/was it Wyle that maintains the site?) contact
him/her ASAP.
Regards,
Naftali Shani, Catena Networks (www.catena.com)
307 Legget Drive, Kanata, Ontario,
Do these standards (50204 61000-4-3)represent the same test?
I thought ENV50140 was the predecessor to IEC801-3/61000-4-3.
CENELEC describes ENC50204 as 'Radiated electromagnetic field from digital
radio telephones', with the scope being:
'The standard relates to the immunity of electrical and
We need to make human exposure measurements for our FCC Part 15 submission
since parts of the body may be closer than 20 cm.
1. Can you recommend a US-based test lab capable of making near field (5-20
cm) E-field measurements at 2.45 GHz from a small (2 inches square) patch
antenna?
2. What
Yes, it says the site is loading in the mean time there is some sort MP3
website there.
Josh
-Original Message-
From: Mike Morrow [mailto:mi...@ucentric.com]
Sent: Wednesday, September 06, 2000 10:32 AM
To: EMC Society
Subject: RCIC been hacked??
Anyone else getting a Napster message
Yes, but I used my browser to get directly into the virtual conference hall
(http://www.rcic.com/adm/cnf/confs.cfm?dir=nr=1ord=dw=pstc), as it only
seems to affect the home page.
-Original Message-
From: Mike Morrow [mailto:mi...@ucentric.com]
Sent: Wednesday, September 06, 2000
Another little nagging problem exists. Without going into the whole
historically precedence UTP was a pretty important reason why ethernet was
adopted so widely. The wiring was pretty much in place because of the cables
that had been run for connecting office telephones etc. People don't want
Although I don't work commercial EMC on a regular basis and I do not know
over what frequency range the telecom port CE are controlled (I assume here
150 kHz - 30 MHz), I believe that there is a mistaken premise inherent in
the comments to which I am responding. The purpose of controlling
Hi all,
just thought I'd throw a few Euros in...
First, until folks in the computer world know what shielded cable means (
anything less that 40 dB is lossy insulation;-))) ), I'd stear clear of
specifying them. This is 20 years of experience talking, and shields seem to
cause more problems
To all,
I know this may be short notice, but some of you may be interested in the
following seminar that will be held later this month. If you are
interested, please follow the links. Otherwise you know what to do.
Best regards,
Ron Pickard
rpick...@hypercom.com
Disclaimer - Neither I nor
Paolo Roncone wrote:
The scope of emissions standard should be
to protect the outside (i.e. public)
environment from interference. So only
ports that connect to public telecom
networks should be covered by the standard.
I disagree.
The purpose of emissions standards is to prevent
Hi,
The test level specified in EN55024 is 3 V/m unmodulated, rms (Erms).
You calibrate the forward power in order to get 3 V/m rms unmodulated.
At this point the peak value of the unmodulated sinusoidal field is Epk = Erms
= 3 V/m.
When you test, you apply 80% AM to this wave. At this point
Hi Mike,
It appears so. Apparently a hacker has breached the security of many
sites. The outcome is that either the Domain Name Servers direct queries
for the hacked-sites to an alternate location where the ANTI ANTI-NAPSTER
rant resides, OR, perhaps the rant itself has replaced the top-level
Yup. Either hacked or someone managed to point RCIC requests to the wrong
IP address.
-Original Message-
From: Mike Morrow [mailto:mi...@ucentric.com]
Sent: Wednesday, September 06, 2000 12:32 PM
To: EMC Society
Subject: RCIC been hacked??
Anyone else getting a Napster message when
Oh Nice!! The 'Napster' hacked into the RCIC site and put a 'Save the
Napster' statement in place of the regular page . . . jerk . . .
I second that. Rich is indeed and asset to this board . . . .
Thank you Rich.
John Juhasz
Fiber Options
Bohemia, NY
-Original Message-
From: pgodf...@icomply.com [mailto:pgodf...@icomply.com]
Sent: Thursday, September 07, 2000 9:42 AM
To: ri...@sdd.hp.com; kmccormick...@hotmail.com
Cc:
Hi Eric,
I 100% agree with you. The scope of emissions standard should be to protect the
outside (i.e. public) environment from interference. So only ports that
connect to public telecom networks should be covered by the standard. The
problem is (as pointed out in one of the previous notes)
I just went through this myself. There is no real correlation between UL94
flame ratings and flame spread ratings. The test methods are completely
different and one cannot predict the flame spread rating from the flame
rating.
Richard Woods
--
From: james Yoo
Greetings,
For those of you who are interested in attending the Colorado
Product Safety Technical Committee (CPSTC) meeting, please read on.
Quick summary:
1. Next meeting: Wednesday, September 13, 2000
Location:Exabyte,
Rich,
As many times in the past, I have found your explanation very concise,
interesting and informative (noting your 'disclaimer'). Thanks for sharing
this with all of us.
Phil Godfrey
-Original Message-
From: Rich Nute [SMTP:ri...@sdd.hp.com]
Sent: Wednesday, September 06, 2000
Yes - I have experienced it in the past. Another wiring scheme you may see
is the pigtail connection of the cable shield terminating to the connector
shell (if your lucky) but more typical it is terminated to the metal portion
of the connector body. Both methods of terminating the cable shield is
Gary, yes, that is correct. My point is that the carrier level is 3 V/m,
modulated or not. The modulation adds peak levels which are not there in an
unmodulated carrier. There are people around who want the 3 V/m to be peak,
because their devices fail if the modulated carrier level is not
Ron: try this link to UltraCad. They have downloadable freeware that does
lots of wonderful stripline and microstrip calculations. The help file
contains the equations used if you want to get into that.
http://www.ultracad.com/calc.htm
-Original Message-
From: Ron Pickard
Hello Group,
North America has likely the largest installed base of Ethernet,
Fast-ethernet, Token-Ring and Arcnet in the world. STP cable is
seldom installed (some use it for secure installations to inhibit
listening devices). We have no complaints of
Darrell, yes, I have, but my solution is not to use such a vendor again.
There are vendors for cables out there who know how to do the job correctly;
and always do it that way! EdB
-Original Message-
From: Darrell Locke (msmail) [mailto:dlo...@advanced-input.com]
Sent: Wednesday,
Hi Dan,
Your comment is very interesting. In fact, my customer is looking for an
inverter (DC-AC), which is -48VDC to 115/230Vac, power being 2KVA.
By the way, I would like to thank you all of you who have answered my query.
Best regards,
Pierre.
-Original Message-
From: Dan
I think the reason you use the 12 of 16 points is so you will always have
the minimum power necessary (leveled RF field) to insure a field strength
of; at a minimum, the level calibrated for. (Due to the EUT distortion
effect while running the test).
Michael Sundstrom
Nokia Mobile Phones, PCC
Ron -
One step better, there are impedance calculators available (Polar comes to
mind) which easily calculate Zo and C (from which you can derive L). I
don't have the web site, but a quick search via an engine can get you there
quickly.
Regards,
Mark Gill, P.E.
EMC/Safety/NEBS Design
C-MAC
Indeed, this particular standard (50204) was automatically withdrawn with
the publishing of the first amendmend A1 to 61000-4-3. I am not sure if it
was explicitly in the A1 either. I do not have the A1 on hand right now.
Regards,
Gert Gremmen, (Ing)
ce-test, qualified testing
We connect to our medical devices standard SVGA computer monitor. Philips
dealer annouced us they are going to change the model we have been using to
comply with the new regulation for switching power supply. I guess this
is related to the 3rd edition of IEC 60950.
Am I correct?
What is the dow
ENV 50204 is still listed in the Cenelec Catalogue 2000 Issue 2 so it's not
withdrawn yet. The reason that this has not been done by Cenelec Technical
Board yet is unknown to me.
regards,
Ari Honkala
-Original Message-
From: EXT Gert Gremmen [mailto:cet...@cetest.nl]
Sent: Wednesday,
Hello to all in the group,
I have a little problem. Yeah, I know, but I'm only admitting this one. ;
-)
So, here's my dilemma. The problem I 've run into is that equations for
distributed capacitance for an microstrip transmission line (plain and
embedded) in a PWB found in a couple of
We recently received some shieled PS-2 cables from a vendor. Upon
inspection of the cables I saw that the shield was not soldered positively
to the shell, it was just twisted back, I guess in hope that the wire would
make contact. When we returned these to the vendor they said you never
asked
Anyone else getting a Napster message when going to the RCIC site??
Mike Morrow
Senior Compliance Engineer
Ucentric Systems
978-897-6482
mi...@ucentric.com
www.ucentric.com
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Technical Committee
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