Hello Colleagues,
I was recently approached regarding the testing of DC conducted emissions on a
car charger for a 2 Way Portable radio and if it is required.
The applicable EMC standard per the RTTE Directive would be 301 489-5, which
basically falls back on 301 489-1 without any special
In message 17191.81.86.19.62.1150098003.squir...@www.kcchosting.co.uk,
dated Mon, 12 Jun 2006, Charles Blackham
charles.black...@sulisconsultants.com writes
However as Point-of-Sale equipment is not typically domestic equipment,
if you can state categorically that this is the case, you could
David:
All:
To claim compliance with EN 301489-1 (I am looking at V1.6.1), Clause 8.4.3
Limits, the way the clause is worded, your equipment is not installed in a
telecommunications center as one would infer from ETSI TR 101 651. The
reason for Table 9: Limits for conducted emissions
So, how about my original question? Is Class A conducted emissions ok for a
tower-mount VSAT power amp? Depending on the answer, I will either enjoy a
beer or have a terrible weekend.
Regards,
David.
_
From: McInturff Gary [mailto:gmcintu...@spraycool.com]
Sent: 9 juin 2006 13:27
9:38 AM
To: McInturff Gary; 'David Heald'; 'David Gelfand'
Cc: emc-p...@ieee.org
Subject: RE: EN 301 489-1 emissions question - Euro telecom center A or B
classification?
Gary,
Your recollection is correct, Telecom centres were indeed Class B in Europe.
It took us several years in the ETSI
Brian Jones
EMC Consultant and Competent Body signatory
_
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Mike Hurley
Sent: 09 June 2006 17:38
To: 'McInturff Gary'; 'David Heald'; 'David Gelfand'
Cc: emc-p...@ieee.org
Subject: RE: EN 301 489-1 emissions question - Euro
to EN55022. There are
probably a few emc-pstc folk who remember the struggle.
Mike
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of McInturff Gary
Sent: 09 June 2006 15:50
To: David Heald; David Gelfand
Cc: emc-p...@ieee.org
Subject: RE: EN 301 489-1 emissions question - Euro
In message
51b0e17d0920404a967d381039139ad0db9...@ds10965.spraycool.com,
McInturff Gary gmcintu...@spraycool.com writes
I have a vague recollection that for some odd reason European
telecommunications centers were Class B but I can?t find the reference.
Mustn't interfere with the night guard's
_
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of David Heald
Sent: Friday, June 09, 2006 7:04 AM
To: David Gelfand
Cc: emc-p...@ieee.org
Subject: Re: EN 301 489-1 emissions question
David,
I am quite certain that a 'telecommunications center' is a central office
David,
I am quite certain that a 'telecommunications center' is a central office.
But, before just assuming that Class A is ok for telecom centers, I'd check
with the telecom company to be sure that they don't have a requirement for
Class B (I have this gut feel that I've run into that but I
To further clarify, it is conducted emissions that is my concern, the
unit will likely be under class B radiated limits.
From: David Gelfand
Sent: 9 juin 2006 09:17
To: emc-p...@ieee.org
Subject: RE: EN 301 489-1 emissions question
Let me clarify. The item to be CE marked is an antenna-mast
In message
a3772c119941df41977965de844184d8ecc...@telefic.telefication.com,
Willem Jan Jong wjj...@telefication.com writes
Class A indeed applies for products meant for the general public. Class
B products are meant for industrial users (e.g. telecom providers)
operated by occupational
Gelfand
Sent: 09 June 2006 13:25
To: emc-p...@ieee.org
Subject: EN 301 489-1 emissions question
I need help from our esteemed CE mark experts!
EMC radio equipment standard EN 301 489-1 calls out EN 55022 Class B
limits in general, and Class A limits for ...equipment intended for use
Let me clarify. The item to be CE marked is an antenna-mast-mounted
VSAT rf power amplifier.
Regards,
David.
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Willem
Jan Jong
Sent: 9 juin 2006 09:07
To: emc-p...@ieee.org
Subject: RE: EN 301 489-1 emissions question
David
David,
A and B are vice versa. Class B is for general public. Class A for industrial
use.
A point-of-sale terminal can be categorized as class B !!
Kind regards,
Willem Jan Jong
From: Willem Jan Jong
Sent: vrijdag 9 juni 2006 14:57
To: 'emc-p...@ieee.org'
Subject: RE: EN 301 489-1 emissions
Certification
Telefication B.V.
Edisonweg 12 A
6902 PK Zevenaar
The Netherlands
+31 (0) 316 583 165
From: David Gelfand [mailto:david.gelf...@mitectelecom.com]
Sent: vrijdag 9 juni 2006 14:25
To: emc-p...@ieee.org
Subject: EN 301 489-1 emissions question
I need help from our esteemed CE mark experts
I need help from our esteemed CE mark experts!
EMC radio equipment standard EN 301 489-1 calls out EN 55022 Class B
limits in general, and Class A limits for ...equipment intended for use
in telecommunication centres only,... What is considered a
telecommunication centre? Unfortunately I can
it has evolved into a more versatile device
than what was described then. But I gues it may be of no interest to
people who write standards grin
Why don't you tell us more about it, and see? I have problems at present
with the revision of EN 55103-1 in respect of conducted emissions: the
methods
emissions
measurements, the port is unable to function. What experience have
people had with ISNs in this application, or what experience do people
have with the alternate test methods (current probe and/or voltage
probe measurements)?
Since it's taken about 8 years to get even a fragile
In message
of83d77521.a76d1666-on8525714f.004fc2d9-8525714f.00506...@pb.com,
dated Thu, 13 Apr 2006, jim.hulb...@pb.com writes
We have an ethernet port to which is connected a CAT5 cable. When this
cable is routed through an ISN per EN 55022 for conducted emissions
measurements, the port
From: jim.hulb...@pb.com [ mailto:jim.hulb...@pb.com]
Sent: Thursday, April 13, 2006 7:38 AM
To: emc-p...@ieee.org
Subject: Conducted Emissions on Ethernet
We have an ethernet port to which
for conducted emissions measurements,
the port is unable to function. What experience have people had with ISNs in
this application, or what experience do people have with the alternate test
methods (current probe and/or voltage probe measurements)?
We are trying to establish a test procedure
We have an ethernet port to which is connected a CAT5 cable. When this cable
is routed through an ISN per EN 55022 for conducted emissions measurements,
the port is unable to function. What experience have people had with ISNs in
this application, or what experience do people have
node can induce enough CM current to couple a signal into other
probes on the test board.
Dave Cuthbert
Micron Technology, Inc.
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Doug
Smith
Sent: Friday, March 03, 2006 12:13 AM
To: emc-pstc
Subject: Predicting Cable Emissions
In message 20060215174652.842.qm...@web30506.mail.mud.yahoo.com, dated
Wed, 15 Feb 2006, Doug Beckwith dougbeckw...@yahoo.ca writes
Isn't CISPR 16-4 the preferred method? This is what was specified to
us by our accrediting agency.
No. Because the ETSI reference is dated, that is the reference
Cc: Ho SzeKhian-CSH090
Subject: Uncertainty Calculations for ETS 300 086 Radiated
Emissions Measurements
Hello
I am in the process of calculating measurement uncertainties
for radiated spurious emissions testing per ETS 300 086
V1.2.1, the version that is listed in the OJ
: Uncertainty Calculations for ETS 300 086 Radiated Emissions
Measurements
Hello
I am in the process of calculating measurement uncertainties for
radiated spurious emissions testing per ETS 300 086 V1.2.1, the
version that is listed in the OJ as the current version.
ETS 300 086
...@lucent.com]
Sent: Wednesday, February 15, 2006 10:59 AM
To: Elliott Mac-FME001; emc-p...@ieee.org
Cc: Ho SzeKhian-CSH090
Subject: RE: Uncertainty Calculations for ETS 300 086 Radiated Emissions
Measurements
All:
Elliott:
If one looks in the back of TR 100028-1 V1.3.1, under Document History, one
Sent: Wednesday, February 15, 2006 9:54 AM
To: emc-p...@ieee.org
Cc: Ho SzeKhian-CSH090
Subject: Uncertainty Calculations for ETS 300 086 Radiated Emissions
Measurements
Hello
I am in the process of calculating measurement uncertainties for radiated
spurious emissions testing per ETS 300 086
Hello
I am in the process of calculating measurement uncertainties for radiated
spurious emissions testing per ETS 300 086 V1.2.1, the version that is listed
in the OJ as the current version.
ETS 300 086 references ETR 028 (1998) for uncertainty calculation.
I do not seem to be able
...@ieee.org
Subject: Humidity and Radiated Emissions Tests
Colleagues,
What is your opinion - does relative humidity have an effect on radiated
emissions testing [as long as there is no condensation on the EUT]?
Just curious as to the thoughts out there [or experiences]
Best regards,
Mac
miles and especially over a water
body. It seems the loss is near neglible within a 10m distance.
It isn't so much power loss in beamed emissions that counts (usually),
it's distortions of radiated field patterns.
--
OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk
2006 is YMMVI
There are formulae for calculating the ERP/EIRP power
loss due to moisture content in the air. Typically
used when calculating point to point microwave links
over several miles and especially over a water body.
It seems the loss is near neglible within a 10m
distance.
Hans
Best Regards
Hans
, January 13, 2006 11:42 AM
To: Elliott Mac-FME001; emc-p...@ieee.org
Subject: RE: Humidity and Radiated Emissions Tests
Interesting question!
Water is a dielectric with absorptive properties that are frequency dependant.
The most well-known peak absorption is the microwave oven 2.4GHz frequency
.
_
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Elliott
Mac-FME001
Sent: Friday, January 13, 2006 11:20 AM
To: emc-p...@ieee.org
Subject: Humidity and Radiated Emissions Tests
Colleagues,
What is your opinion - does relative humidity have an effect on radiated
In message
54ffbe24c443bc45b8deb804650d2d2ba3a...@ct11exm64.ds.mot.com, dated
Fri, 13 Jan 2006, Elliott Mac-FME001 fme...@motorola.com writes
What is your opinion - does relative humidity have an effect on
radiated emissions testing [as long as there is no condensation on the
EUT]?
The phases
, January 13, 2006 11:20 AM
To: emc-p...@ieee.org
Subject: Humidity and Radiated Emissions Tests
Colleagues,
What is your opinion - does relative humidity have an effect on radiated
emissions testing [as long as there is no condensation on the EUT]?
Just curious as to the thoughts out
and Radiated Emissions Tests
Colleagues,
What is your opinion - does relative humidity have an effect on radiated
emissions testing [as long as there is no condensation on the EUT]?
Just curious as to the thoughts out there [or experiences]
Best regards,
Mac
Colleagues,
What is your opinion - does relative humidity have an effect on radiated
emissions testing [as long as there is no condensation on the EUT]?
Just curious as to the thoughts out there [or experiences]
Best regards,
Mac
emissions.
On the other hand, another well known EMI/EMC speaker/author states that it
can definitely help. What is the opinion of conformity (SI) members and what
empirical results have been obtained?
Second question. A well-known EMI speaker/author also states that spread
spectrum clocking
Cortland,
The Ansoft URL's pdf comes up nil.
Going to the \thewave\ index doesn't list that .pdf
Would you send me a copy?
- Robert -
On Sun, 27 Nov 2005 20:47:48 -0500
Cortland Richmond 72146@compuserve.com wrote:
Ken Javor wrote
I didn't know what the 20 H rule was
20:47:48 -0500
To: ieee pstc list emc-p...@ieee.org
Subject: Re: Suppression of radiated emissions and spread spectrum clocking
Ken Javor wrote
I didn't know what the 20 H rule was either, just assumed everyone else
did...
See
http://www.qsl.net/wb6tpu/si-list4/0391.html
page 9
Ken Javor wrote
I didn't know what the 20 H rule was either, just assumed everyone else
did...
See
http://www.qsl.net/wb6tpu/si-list4/0391.html
page 9 of http://www.ansoft.com/thewave/Shielding_and_Decoupling.pdf
http://factaee.elfak.ni.ac.yu/fu2k12/fu04.html
and others (search on 20H rule.)
I didn't know what the 20 H rule was either, just assumed everyone else
did...
From: John Woodgate j...@jmwa.demon.co.uk
Date: Sun, 27 Nov 2005 18:49:13 +
To: emc-p...@ieee.org
Subject: Re: Suppression of radiated emissions and spread spectrum clocking
americo...@aol.com wrote
americo...@aol.com wrote (in 26c.a77014.30bb4...@aol.com) about
'Suppression of radiated emissions and spread spectrum clocking', on
Sun, 27 Nov 2005:
Conformity and SI List
I attended an electronic conference where a well-known EMI/EMC
speaker/author stated that the 20 H rule is useless
Reply to second question only.
In a limited sense it is correct that a spread spectrum clock doesn't decrease
emissions, it spreads them out (in the frequency domain). The spread spectrum
clock decreases the amount of time a signal is within the pass-band of the
receiver, making it appear
This is a multi-part message in MIME format.
Conformity and SI List
I attended an electronic conference where a well-known EMI/EMC speaker/author
stated that the 20 H rule is useless for suppression of radiated emissions.
On the other hand, another well known EMI/EMC speaker/author
regulations or standards does Japan
have in place for incidental emissions near 5 GHz?
Regards,
Don Umbdenstock
Manager Compliance Engineering
Tyco Safety Products / Sensormatic
6600 Congress Avenue
Boca Raton, FL 33487 USA
561.912.6440
djumbdenst...@tycoint.com
_
From: mlehm...@herberg
A note about MIL-STD-461. Obsolete versions (basic release through -461C)
controlled conducted emissions to 50 MHz. But they did this by limiting the
power cord length to a maximum of one meter from test sample to 10 uF
feedthrough capacitor, the latter used instead of an inductive LISN. At 50
Hi all,
A few standards come to mind depending on product application:
MIL - STD 461/462 has conducted power line emissions measurements to higher
frequencies (do not remember how high?). Also RTCA DO-160 for aircraft
products / environments.
Also consider CISPR 14 (absorption clamp method
and safety ground).
From: Garnier, David S (GE Healthcare) david.garn...@med.ge.com
List-Post: emc-pstc@listserv.ieee.org
Date: Thu, 29 Sep 2005 10:55:58 -0500
To: emc-p...@ieee.org
Subject: Measuring Conducted Emissions above 30 Mhz
Hello EMC Guru's,
I am looking for some guidance
Hello EMC Guru's,
I am looking for some guidance...
Is there an established Standard Test Method for measuring
AC Power Conducted Emissions above 30 MHz (say to 150 MHz?)
((Obviously, CE limits for CISPR11 only go to 30 Mhz.))
Thanks for your time,
Dave Garnier
David
Hello,
Does anyone know of a laboratory for hire (preferably in the Northeast US)
that has a 10 meter radiated emissions test site that is also lead shielded
for testing X-ray equipment? The test site would also need 400 or 480 VAC and
greater than 100 ampere power supply capability.
Thanks
To: emc-p...@ieee.org
Subject: Use of Dipole Antenna's For FCC-A Emissions Testing
Hi Group,
It's been quite a while since I've done this so I figure I would ping it off
the group for a consensus. Back in the old days, you could use a Dipole
antenna to take radiated emission measurements
To: Pettit, Ghery; emc-p...@ieee.org
Subject: RE: Use of Dipole Antenna's For FCC-A Emissions Testing
I may be thinking of CISPR 16, but I know there is a standard that says a
tuned dipole, if used vertical, must remain tuned to 80 MHz or so for
measurements down to 30 MHz. To properly do
: Use of Dipole Antenna's For FCC-A Emissions Testing
Hi Group,
It's been quite a while since I've done this so I figure I would ping it off
the group for a consensus. Back in the old days, you could use a Dipole
antenna to take radiated emission measurements for frequencies that were
either
for FCC-A
radiated emissions testing?
For background info, by tuning the dipole antenna to the exact frequency, you
were able to obtain a more accurate reading than using a broadband antenna.
Sometimes you would gain a few dB, sometimes you would lose a few dB.
One thing I remember about
for those interested. The URL is long and you may need to
unwrap it to use it.
http://www.iec.ch/online_news/etech/arch_2005/etech_0805/new
s.htm?mlref=e-tech#emc_limits
Regards,
Peter L. Tarver, PE
ptar...@ieee.org
This message is from the IEEE Product Safety Engineering Society
emc-pstc
Dear colleagues;
I would like to thank all those who replied to my predicament regarding
emissions from an Ethernet port.
I have had some first-class advice which will help me solve the problem.
Many thanks;
Ian McBurney.
Allen Heath Limited.
email: ian.mcbur...@allen-heath.com
***LEGAL
possibility, but one I have encountered
that caused a similar failure.
Good luck.
Eric Lifsey
At 12:17 PM +0100 6/17/05, McBurney, Ian [Allen Heath UK] wrote:
Dear colleagues;
Can anyone advise me how to reduce the radiated emissions from a 100
base-T Ethernet port with a UTP cable connected
with
Regards, Neven
-- Original message --
Dear colleagues;
Can anyone advise me how to reduce the radiated emissions from a 100 base-T
Ethernet port with a UTP cable connected to below the EN55022 class B limit?
At the moment I am 20dB above the limit at 33MHz. Using STP only
-485-2537
fax: 858-485-3788
_
From: owner-emc-p...@ieee.org [mailto:owner-emc-p...@ieee.org] On Behalf Of
Ken Javor
Sent: Friday, June 17, 2005 5:30 AM
To: McBurney, Ian [Allen Heath UK]; emc-p...@ieee.org
Subject: Re: ethernet radiated emissions
No experience with Ethernet per se
-emc-p...@ieee.org]On Behalf Of
McBurney, Ian [Allen Heath UK]
Sent: Freitag, 17. Juni 2005 13:17
To: emc-p...@ieee.org
Subject: ethernet radiated emissions
Dear colleagues;
Can anyone advise me how to reduce the radiated emissions from a 100 base-T
Ethernet port with a UTP cable connected
: ethernet radiated emissions
Dear colleagues;
Can anyone advise me how to reduce the radiated emissions from a 100 base-T
Ethernet port with a UTP cable connected to below the EN55022 class B limit?
At the moment I am 20dB above the limit at 33MHz. Using STP only reduces the
emissions by 6dB
No experience with Ethernet per se, so this is a very general comment. It
sounds as if the emissions are common mode. If so, they may not have anything
to do with the Ethernet itself, the Ethernet may be a fortuitous conductor. I
would check this using a current probe around the cable
Dear colleagues;
Can anyone advise me how to reduce the radiated emissions from a 100 base-T
Ethernet port with a UTP cable connected to below the EN55022 class B limit?
At the moment I am 20dB above the limit at 33MHz. Using STP only reduces the
emissions by 6dB.
Thanks in advance;
Ian
, February 23, 2005 7:24 AM
To: emc-p...@ieee.org
Subject: Radiated Emissions 1GHz
All:
I am considering the purchase of a HP 8569B Spectrum analyzer for
pre-compliance radiated emission measurements beyond 1GHz. The unit is a very
reasonably price and would appear to be satisfactory for pre
From: Donald McElheran [ mailto:dmcelhe...@rossvideo.com]
Sent: Wednesday, February 23, 2005 7:24 AM
To: emc-p...@ieee.org
Subject: Radiated Emissions 1GHz
All:
I am considering
Donald,
If you intend to use it under software control, it is not very good. You must
do many things manually, including switching ranges. At most you can use
software to capture scans and apply cable and antenna factors.
Bob Richards.
Square D.
Donald McElheran dmcelhe...@rossvideo.com
All:
I am considering the purchase of a HP 8569B Spectrum analyzer for
pre-compliance radiated emission measurements beyond 1GHz. The unit is a very
reasonably price and would appear to be satisfactory for pre-compliance
requirements. Intend to configure the SA with a Low noise 1 GHz - 18 GHz
Laird Technologies, Chomerics Tech-Etch Products to name a few good
companies that have these emi gaskets.
From: McBurney, Ian [Allen Heath UK] [mailto:ian.mcbur...@allen-heath.com]
Sent: Monday, January 17, 2005 6:26 AM
To: emc-p...@ieee.org
Subject: Card cage emissions
Dear colleagues;
I
that
will bond the panels together. The bonding only needs to be in one or
two positions to half the wavelength of the emissions.
However the cards must be able to be removed and replaced.
This message is from the IEEE Product Safety Engineering Society
emc-pstc discussion list.Website: http://www.ieee
/
From: McBurney, Ian [Allen Heath UK] [mailto:ian.mcbur...@allen-heath.com]
Sent: 17 January 2005 14:26
To: emc-p...@ieee.org
Subject: Card cage emissions
Dear colleagues;
I hope that someone may have come across this problem before.
I have a 19 card cage that has rf emissions radiating from
Ian,
Instrument Specialties in the US may have something.
Josh
McBurney, Ian [Allen Heath UK] wrote:
Dear colleagues;
I hope that someone may have come across this problem before.
I have a 19” card cage that has rf emissions radiating from the slots
between the front panels. By using
Dear colleagues;
I hope that someone may have come across this problem before.
I have a 19” card cage that has rf emissions radiating from the slots
between the front panels. By using a single horizontal strip of copper tape
across the front of the card cage I am able to reduce the emissions
: Wednesday, January 12, 2005 10:56 AM
To: emc-p...@ieee.org
Subject: FW: Extension of the DFS requirement for UNII, BPL publication i n
the Federal Register, OET clarifies measurement of Broadband emissions, new
EMCD, new Automotive EMCD
Hello Group,
The new EMC Directive comes into force on Jan 20
Umbdenstock
Tyco Safety Products/Sensormatic
_
From: Sid Sanders [mailto:s...@timco.cc]
Sent: Tuesday, January 11, 2005 1:09 PM
To: s...@timco.cc
Subject: Extension of the DFS requirement for UNII, BPL publication in the
Federal Register, OET clarifies measurement of Broadband emissions, new
8:02 PM
To: Ken Javor; Ralph McDiarmid; ieee pstc list
Subject: RE: Conducted Emissions PK/AVG
Your point is well taken Ken, and this certainly is interesting. My
approach to the concept of average does indeed run afoul of the
limitations of measurement devices and the potential for instrument
:02 PM
To: Ken Javor; Ralph McDiarmid; ieee pstc list
Subject: RE: Conducted Emissions PK/AVG
Your point is well taken Ken, and this certainly is interesting. My
approach to the concept of average does indeed run afoul of the
limitations of measurement devices and the potential for instrument
: Re: Conducted Emissions PK/AVG
Now this is getting interesting. If you arbitrarily reduce the VBW until
you see no time dependent amplitude variation, I think that leads to
non-repeatability. That is, if my spectrum analyzer has a 1 Hz VBW, and
yours has a 10 Hz VBW, we could get different
...@ix.netcom.com; Ralph McDiarmid; ieee pstc list
Subject: Re: Conducted Emissions PK/AVG
Now this is getting interesting. If you arbitrarily reduce the VBW until
you see no time dependent amplitude variation, I think that leads to
non-repeatability. That is, if my spectrum analyzer has a 1 Hz
...@ix.netcom.com
Reply-To: bdew...@ix.netcom.com
Date: Fri, 17 Dec 2004 18:39:11 -0800
To: Ralph McDiarmid ralph.mcdiar...@xantrex.com, ieee pstc list
emc-p...@ieee.org
Subject: RE: Conducted Emissions PK/AVG
Hi Ralph,
The HP 8568 and 8566 have a video averaging function, which averages
multiple
: 425-883-4757
cell: 425-417-8228
-Original Message-
From: owner-emc-p...@ieee.org [mailto:owner-emc-p...@ieee.org]On Behalf
Of Ralph McDiarmid
Sent: Friday, December 17, 2004 11:51 AM
To: ieee pstc list
Subject: RE: Conducted Emissions PK/AVG
I suggest there is an important
[mailto:owner-emc-p...@ieee.org] On Behalf
Of Cortland Richmond
Sent: December 16, 2004 1:04 PM
To: Alex McNeil; ieee pstc list
Subject: Re: Conducted Emissions PK/AVG
Alex McNeil asked:
Is the problem that the Test House may have used AVG BW 30KHz and
this
should have been AVG BW 9KHz the problem
Sure
Alex McNeil asked:
Is the problem that the Test House may have used AVG BW 30KHz and this
should have been AVG BW 9KHz the problem
Sure looks like it from what you posted. There've been discussions here --
it comes up every so often -- how to to do averaging on a SA. Without
knowing how they
scale set to LOG,
OOPS, that should have been LINEAR Sorry.
Bob Richards b...@toprudder.com wrote:
Alex,
It is very common that the emissions plots will be made with the RBW and VBW
that you mentioned. The actual QP and AV measurements should have the
instrument set
Alex,
It is very common that the emissions plots will be made with the RBW and VBW
that you mentioned. The actual QP and AV measurements should have the
instrument set with the appropriate detector and bandwidths. The RBW should
always be 9kHz, and for the average measurement the VBW should
: Thursday, December 16, 2004 8:19 AM
To: emc-p...@ieee.org
Subject: Conducted Emissions PK/AVG
Hi Guys,
I had a product tested that failed the conducted emissions. The switch mode
power supply was the problem. It runs at approx. 200KHz. The failed readings
were in the 150KHz to 600KHz band
, the
measurement is a pass.
If you have quasi-peak measurements higher than the peaks measurements,
then either something is wrong with the test equipment/software, or the
emissions of the EUT changed between the time the two measurements were
made.
Don Borowski
Schweitzer Engineering Labs
Pullman, WA
Hi Guys,
I had a product tested that failed the conducted emissions. The switch mode
power supply was the problem. It runs at approx. 200KHz. The failed readings
were in the 150KHz to 600KHz band. The peaks were over the Avg and below the
QPk, so the Avg test was done. This resulted
Carl Richards posted:
Before I rush off back to development, I wondered if anyone in the group
had any advice about implementing small areas of ground plane directly
underneath oscillators ? I'm going to request upper and lower ground planes
with via stitching between them and our internal
Dear Group,
We're working on a next Rev of board on our system and we're having a problem
with a 66MHz oscillator during radiated emissions testing. The board slides
vertically into a shelf(aka the card cage). The solder side of the board is
approx 1/4 from a plated steel vertical which is one
emissions at 30MHz
Hi Pat,
May be it helps reading through the literature on our web (
www.euro-emc-service.de ) with hints to our inventions like GTEM (end of 80s),
EUROTEM (End of 90s) etc, plus background (RD-web-section) info.
A size limited TEM device can not do everything but may sometimes
: Using TEM cells for radiated emissions at 30MHz
Hi:
I was given some literature by management recently advertising the use of a
TEM cell for radiated emissions:
http://www.wavecontrol.com/index2004.php?idioma=2
Our people have the impression that a TEM cell small enough to fit on a
table
. Detailed info also in IEC 61000-20. TEM Devices for radiated emission
and immunity.The basic idea is to consider a free space (TEM-basically only
mode) wave inside and for emissions use the concept of t o t a l radiated
power to correlate to OATS.This requires EUT mechanical rotations in a GTEM
(Dr
, November 17, 2004 12:19 PM
To: emc-p...@ieee.org
Subject: Using TEM cells for radiated emissions at 30MHz
Hi:
I was given some literature by management recently advertising the use of a
TEM cell for radiated emissions:
http://www.wavecontrol.com/index2004.php?idioma=2
Our people have
Hi:
I was given some literature by management recently advertising the use of a
TEM cell for radiated emissions:
http://www.wavecontrol.com/index2004.php?idioma=2
Our people have the impression that a TEM cell small enough to fit on a
table-top could eliminate the need to go to the local OATS
mains emissions testing
Bill,
You must have a LISN on all three phases, and neutral if the product has that.
All the LISNs not being measured must have the measurement port terminated by
a 50 ohm load. You can either use a LISN that has all three phases, or you
could use multiple single-conductor
.
The measurement method is spelled out in CISPR 22 or 11 or ??, whichever is
appropriate for your product.
Bob Richards, NCT
Square D.
Bill Flanigan bflani...@ameritherm.com wrote:
Esteemed homologists,
Is anyone familiar with the requirements for conducted emissions testing on
three-phase mains? Can one
Esteemed homologists,
Is anyone familiar with the requirements for conducted emissions testing on
three-phase mains? Can one impoverished tester insert one rented (30A-capable)
LISN to each line in turn, or must the LISN involve all three lines
simultaneously? CISPR 16-1 is a little vague
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