available channels that are unusable due to noise, forcing the
phone to hunt for a new channel. (Hello Motorola, Nokia...) This channel
hunting feature is the only reliable way a cell phone can function around other
electronics. And, don't forget broadband noise emissions which can disturb
numerous
Hello Group,
I have some doubts concerning conducted emissions:
1. I'll make a hypothetical case: Let's say I have 2 electronic
equipment (they can be switched mode power supplies). Equipment A
requires 100W. Equipment B requires 3W. Let's say that my readings of
conducted emissions, collected
For the folks interested in the subject of EMI Emissions Test on Telecom
Ports (according to EN55022:1998/CISPR 22: 1997), I would recommend an
excellent Article by Dr. R. Gubish in the April 2000 issue of the TM World.
Vitaly Gorodetsky
Compliance Engineer Direct: (818) 678
The answer to your question is Yes!.
A good reference would be FCC Part 15.107(f) for
the United States which accepts measurements to
CISPR22. The FCC rules for emissions test setups
are generally more restrictive than those of
Europe and you cannot loose if you apply a
conservative
, 2000 7:55 AM
To: emc-p...@majordomo.ieee.org
Subject: EN 55022 Conducted Emissions
I have had an inquiry that I am not sure of the answer and I was hoping that
someone could provide me with an answer.
If an EUT is DC powered device (i.e., a video card, internal modem, etc.),
deriving its power
Yes!
- Original Message -
From: Brooks, Barbara bbro...@hnt.wylelabs.com
To: emc-p...@majordomo.ieee.org
Sent: Wednesday, August 02, 2000 7:55 AM
Subject: EN 55022 Conducted Emissions
I have had an inquiry that I am not sure of the answer and I was hoping
that
someone could provide
%hnt.wylelabs@interlock.lexmark.com
To: emc-pstc%majordomo.ieee@interlock.lexmark.com
cc:(bcc: George Alspaugh/Lex/Lexmark)
Subject: EN 55022 Conducted Emissions
I have had an inquiry that I am not sure of the answer and I was hoping that
someone could provide me with an answer
I have had an inquiry that I am not sure of the answer and I was hoping that
someone could provide me with an answer.
If an EUT is DC powered device (i.e., a video card, internal modem, etc.),
deriving its power from a host's power supply (i.e., a video card, internal
modem, etc.) would the
Folks,
The original release of GR-1089 specified a 10 uF feedthrough for conducted
emissions. A subsequent revision of the document, GR-1089 Issue 2, December
1997, specified LISN's for conducted emissions in place of the feedthrough caps
, June 15, 2000 1:35 PM
To: EMC-PSTC; t...@world.std.com; n...@world.std.com
Subject: Bellcore GP-1089 emissions testing: LISN test setup
I'm looking through Bellcore GR-1089 Issue 2 Revision 1 for details on the
test
setup for conducted emissions testing.
I was under
, June 15, 2000 1:35 PM
To: EMC-PSTC; t...@world.std.com; n...@world.std.com
Subject: Bellcore GP-1089 emissions testing: LISN test setup
I'm looking through Bellcore GR-1089 Issue 2 Revision 1 for details on the
test
setup for conducted emissions testing.
I was under the impression that some
-
From: plaw...@west.net [mailto:plaw...@west.net]
Sent: Thursday, June 15, 2000 10:35 AM
To: EMC-PSTC; t...@world.std.com; n...@world.std.com
Subject:Bellcore GP-1089 emissions testing: LISN
test setup
I'm
I'm looking through Bellcore GR-1089 Issue 2 Revision 1 for details on the test
setup for conducted emissions testing.
I was under the impression that some of the measurements involved use of large
RF bypass caps to ground, and the interference currents through the capacitor
were measured.
While
the emissions down the whole 5m of cable is getting
kind of tiresome. Incidentally, the largest peaks so far have always been
the ones nearest to the EUT.
Thanks and regards
Chris Colgan
EMC Safety
TAG McLaren Audio Ltd
mailto:chris.col...@tagmclarenaudio.com
.)
[mailto:v-ang...@microsoft.com]
Sent: Wednesday, March 01, 2000 2:38 PM
To: EMC PSTC (E-mail)
Subject: Conducted Emissions Testing for CNS13438 Class B
Hi everyone:
Does Taiwan's CNS13438 Class B approval require both 115V and 235V
conducted
emissions tests?
Thanks,
Angus McGill
Regulatory
Hi everyone:
Does Taiwan's CNS13438 Class B approval require both 115V and 235V conducted
emissions tests?
Thanks,
Angus McGill
Regulatory Engineer
Cascade Engineering Services, Inc.
---
This message is from the IEEE EMC Society Product Safety
Does this approval require both 120V and 230V conducted emissions? Any good
English language links relating to this?
Angus McGill
Regulatory Engineer
Cascade Engineering Services, Inc.
---
This message is from the IEEE EMC Society Product Safety
: conducted emissions test setup
Ken,
The ground plane should be non-ferrous? That is a new one to me. Are all
the
OATS I have been to using non-ferrous ground planes? Never really noticed
that before. I thought they were all galvanized steel. Somebody please
enlighten me.
Scott
mailto:chris.col...@tagmclarenaudio.com
-Original Message-
From: eric.lif...@ni.com [SMTP:eric.lif...@ni.com]
Sent: 24 February 2000 18:01
To: emc-p...@ieee.org
Subject: RE: conducted emissions test setup
Gert et al,
A non-ferrous OATS requirement (or preferred)? That's a new one
/-/
===
-Original Message-
From: Robert Macy [mailto:m...@california.com]
Sent: Wednesday, February 23, 2000 10:50 PM
To: Gert Gremmen; Muriel Bittencourt de Liz; Lista de EMC da IEEE
Subject: Re: conducted emissions test setup
Gert,
The connection (Wire
, MA USA
-Original Message-
From: ken.ja...@emccompliance.com [mailto:ken.ja...@emccompliance.com]
Sent: Wednesday, February 23, 2000 6:22 PM
To: mur...@grucad.ufsc.br; emc-p...@ieee.org
Subject: Re: conducted emissions test setup
Importance: Low
The ground plane acts as a sink
/-/
===
-Original Message-
From: Robert Macy [mailto:m...@california.com]
Sent: Wednesday, February 23, 2000 10:50 PM
To: Gert Gremmen; Muriel Bittencourt de Liz; Lista de EMC da IEEE
Subject: Re: conducted emissions test setup
Gert,
The connection (Wire
I was wrong. I was thinking of the military paradigm. You are absolutely
right that OATS' use galvanized steel hardware cloth. Sorry for the brain
cramp.
--
From: Scott Douglas s_doug...@ecrm.com
To: ken.ja...@emccompliance.com, emc-p...@ieee.org
Subject: RE: conducted emissions test
: Wednesday, February 23, 2000 11:57 PM
Subject: RE: conducted emissions test setup
Robert, Muriel and group,
Therefore it is essential that the mains wire is short and limited
to 50 cm ( 2 feet) or even less. The transformer model I can see
( 3 longitudal straight windings , sharing the same magnetic
: Thursday, February 24, 2000 2:48 PM
To: Gert Gremmen
Cc: Robert Macy; Muriel Bittencourt de Liz; Lista de EMC da IEEE
Subject: Re: conducted emissions test setup
Hello all,
I will take a stab at Gert's question and offer a correction to the
statement he made about the mains lead:
The mains
Lifsey
National Instruments
Please respond to Scott Douglas s_doug...@ecrm.com
To: ken.ja...@emccompliance.com, emc-p...@ieee.org
cc:(bcc: Eric Lifsey/AUS/NIC)
Subject: RE: conducted emissions test setup
Ken,
The ground plane should be non-ferrous? That is a new one to me. Are all
...@ecrm.com]
Sent: Thursday, February 24, 2000 5:34 AM
To: ken.ja...@emccompliance.com; emc-p...@ieee.org
Subject: RE: conducted emissions test setup
Ken,
The ground plane should be non-ferrous? That is a new one to me. Are all
the
OATS I have been to using non-ferrous ground planes
OK, y'all have had a lot of fun with it. I WAS WRONG! Sorry!
--
From: eric.lif...@ni.com
To: emc-p...@ieee.org
Subject: RE: conducted emissions test setup
Date: Thu, Feb 24, 2000, 10:00 AM
Gert et al,
A non-ferrous OATS requirement (or preferred)? That's a new one on me too
Hello Group,
Reading CISPR 16 and CISPR 22, I had some doubts about the correct setup
for doing conducted emissions testing. I'd like to know if someone can
put a light on this subject.
My questions are:
- The ground plane is really needed? If I don't use one, my results
will be wrong
Greetings Muriel,
Please see my responses below in [Brackets]..
Have Fun,
George
-Original Message-
From: Muriel Bittencourt de Liz [mailto:mur...@grucad.ufsc.br]
Sent: Wednesday, February 23, 2000 11:33 AM
To: Lista de EMC da IEEE
Subject: conducted emissions test setup
Hello Group
...@ieee.org]On Behalf
Of Muriel Bittencourt de Liz
Sent: Wednesday, February 23, 2000 5:33 PM
To: Lista de EMC da IEEE
Subject: conducted emissions test setup
Hello Group,
Reading CISPR 16 and CISPR 22, I had some doubts about the correct setup
for doing conducted emissions testing. I'd like to know
be fed
from different circuits. The green wire should be common to both circuits.
--
From: Muriel Bittencourt de Liz mur...@grucad.ufsc.br
To: Lista de EMC da IEEE emc-p...@ieee.org
Subject: conducted emissions test setup
Date: Wed, Feb 23, 2000, 8:32 AM
Hello Group,
Reading CISPR 16
23, 2000 8:51 AM
Subject: conducted emissions test setup
Hello Group,
Reading CISPR 16 and CISPR 22, I had some doubts about the correct setup
for doing conducted emissions testing. I'd like to know if someone can
put a light on this subject.
My questions are:
- The ground plane is really
de EMC da IEEE
emc-p...@ieee.org
Subject: Re: conducted emissions test setup
Date: Wed, Feb 23, 2000, 3:21 PM
The ground plane acts as a sink for common mode CE. Without it, you have an
uncontrolled test.
The ground plane should be non-ferrous. Cu or bronze or even Al will work,
but you can
Liz mur...@grucad.ufsc.br; Lista de EMC da IEEE
emc-p...@ieee.org
List-Post: emc-pstc@listserv.ieee.org
Date: Wednesday, February 23, 2000 1:17 PM
Subject: RE: conducted emissions test setup
Hello Mureil,
When it comes to conducted emission measurements:
The test consist of one loop:
EUT
Ken,
Commonly available shielded rooms are made from galvanized steel panels.
Does your comment mean that these chambers are not very good for the ground
reference for conducted emissions tests?
Don Umbdenstock
--
From: Ken Javor[SMTP:ken.ja...@emccompliance.com]
Reply
. But getting back to the mil situation:
Whether or not the ground plane makes any connection to the steel walls of a
shield room has no effect on the conducted emissions. The parameters that
count are the bond between EUT and ground plane, and the bond between LISN
and ground plane. All
Hello Muriel,
Time to elaborate on conducted emissions.
Whatever you measure using CISPR22 is Common Mode voltage over 50 Ohms.
This means that the spectrum analyzer has ground on an arbitrary ground
plane,
and that the test pin is connected to one of the two phases of your mains
connection
Muriel Bittencourt de Liz wrote:
Hello Group,
I'd like to clarify a question:
- If I realize a conducted emission test in my lab with an EUT, I get a
result, I compare it with the apropriate standard, and I can say if it's
compliant or not, right?
- So, if another lab do the
Hello Group,
I'd like to clarify a question:
- If I realize a conducted emission test in my lab with an EUT, I get a
result, I compare it with the apropriate standard, and I can say if it's
compliant or not, right?
- So, if another lab do the conducted emission test in the same EUT, and
get
a lab do RF emissions testing on a desktop product that has
a foot pedal.
The lab technician insists on putting the foot pedal on the table-top
along with the system. I assume he's doing that because the typical
setup for a desktop PC has the keyboard and mouse on the table along
with the PC
Lawler wrote:
I'm having a lab do RF emissions testing on a desktop product that has
a foot pedal.
The lab technician insists on putting the foot pedal on the table-top
along with the system. I assume he's doing that because the typical
setup for a desktop PC has the keyboard and mouse
in the report. If they won't do that, find better lab!
Derek Walton
Patrick Lawler wrote:
I'm having a lab do RF emissions testing on a desktop product that has
a foot pedal.
The lab technician insists on putting the foot pedal on the table-top
along with the system. I assume he's doing that because
You are absolutely right.
A foot pedal is to be placed on the floor. The lab technician may
maximize the emissions by finding the worst case location in a TYPICAL
application. In other words, he/she can move the foot pedal under the
table while resting on the floor and not on the table top
I'm having a lab do RF emissions testing on a desktop product that has
a foot pedal.
The lab technician insists on putting the foot pedal on the table-top
along with the system. I assume he's doing that because the typical
setup for a desktop PC has the keyboard and mouse on the table along
Derek,
Absorbing clamp for use in the frequency range 30 - 1000 MHz is described in
CISPR 16-1:1998, Section 13.
There were many attempts in CISPR SC G by Swiss and Swedish national
committees to introduce absorbing clamp as the alternative test method to
OATS for information technology
Hi all,
I've just seen data from an emissions test using a clamp. The unusual
aspect was that this covered 30 MHz to 1 GHz. The test lab claimed that
it satisfied the requirements of CISPR 11 and 22, is this the case?
Any way this can be correlated back to a radiated test?
Thanks,
Derek
, December 02, 1999 5:39 PM
To: Price, Ed; d...@dsmith.org
Cc: emc-pstc
Subject: Re: Ferrites can increase emissions?
In such a case did you place a ferrite device at both ends of the cable?
It
has worked for me.
Ralph
- Original Message -
From: Price, Ed ed.pr...@cubic.com
Hi All,
I have noticed (like I expect many of you) that sometimes adding a
ferrite on a cable to suppress common mode current caused emissions
actually increases emissions at some frequencies. After thinking about
this and trying an experiment to confirm one mechanism, I wrote up an
article
The purpose of a common mode choke whether it be of ferrite or powdered iron
is to isolate the connecting conductors from the rest of the mainboard or
chassis. If the toridal core is correctly placed as close to the source of
the emissions i.e. the PCB, the conductors which carry the emitted
for the particular case below.
The special case in my article goes a level deeper than your
discussion to show that ferrites at one end of a cable can either
increase or decrease emissions from equipment at the opposite end by
either causing an impedance match or mismatch. No ground loops
needed
Hi Doug:
The term ground loop is misleading I agree. I meant to say coupling and by
placing the ferrite remotely from the source of the emissions only serves to
end load the conductors which will change the resonant length.
In the case of placing the toroidal device on the power cord, right
I have had the experience of putting ferrite chokes on a cable bundle which
connected two parts of a system. Putting the choke close to Box A, some
radiated emissions went down and some went up. It doesn't seem reasonable at
first, until you remember that each box may be contributing some
and by
placing the ferrite remotely from the source of the emissions only serves to
end load the conductors which will change the resonant length.
In the case of placing the toroidal device on the power cord, right at the
point of entry to the PCB, chassis, cabinet etc. the coupling loop as
opposed
increase emissions?
Hi Ralph,
I don't advocate placing the ferrite on the far end of cords. My example
is
meant to be instructive of the kind of mechanisms at work here and take
some of the magic out of using ferrites.
I would be interested in hearing from others in this group of unusual
, David david.brumba...@pss.boeing.com
To: 'Ken Javor' ken.ja...@emccompliance.com
Cc: 'emc-pstc' emc-p...@ieee.org
Subject: RE: Conducted Emissions for PS output
Date: Wed, Nov 17, 1999, 5:25 PM
Maybe I've been working on space systems too long...you can draw your own
conclusions about that. At any
Derek: In the US (or Canada) I am not aware of any FCC or I.C.
documents that limit conducted emissions from the output of a power
supply or battery charger. In Europe, for CE Mark purposes, you
definitely need to have a look at the applicable EN's, because some of
them do have requirements
understand what you
are saying.
--
From: Brumbaugh, David david.brumba...@pss.boeing.com
To: EMC Discussion Group emc-p...@ieee.org, 'Derek Walton' l...@rols1.net
Subject: RE: Conducted Emissions for PS output
Date: Wed, Nov 17, 1999, 7:52 AM
If the power supply is for a single unit utilizing
Walton'
Subject: Re: Conducted Emissions for PS output
Re this: If the power supply is for a single unit utilizing a common power
bus for the power supply input, then the output ripple of the supply might
need to be controlled more stringently, perhaps on the order of tens of
millivolts
it hundreds of
times. It also prevents ingress of RF.
Ralph Cameron
Independent EMC Consultant
- Original Message -
From: Derek Walton l...@rols1.net
To: EMC Discussion Group emc-p...@ieee.org
Sent: Tuesday, November 16, 1999 6:33 PM
Subject: Conducted Emissions for PS output
HI,
would
Emissions for PS output
HI,
would anyone like to suggest a specification for controlling conducted
emissions from the output of a power supply or battery charger. The
market place is either the USA or Europe.
Thanks,
Derek.
--
Derek Walton
Owner
L. F. Research EMC Design and Test
can look at present FCC/CISPR limits for that, with one important caveat.
You need only apply such limits to common mode emissions. Differential mode
emissions won't radiate significantly as long as feeder and return are in
close proximity. DM limits could be 20 - 30 dB relaxed or more, depending
HI,
would anyone like to suggest a specification for controlling conducted
emissions from the output of a power supply or battery charger. The
market place is either the USA or Europe.
Thanks,
Derek.
--
Derek Walton
Owner
L. F. Research EMC Design and Test Facility
12790 Route 76,
Poplar
is
used as a commercial/industrial product the digital portion only had to meet
Class A emissions performance for that product.Can the new product be
split into two parts and say that the radio portion must meet Class B but
the digital portion only has to meet Class A.
Or is it once
Pierre,
I understand from your request that you are following FCC Part 15 Subpart C for
an intentional radiator that operates on an ISM frequency. I think the section
you are recalling regarding frequencies generated by the product, except the
one needed for functional purpose is part
-
From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org] On Behalf Of Muriel Bittencourt
de Liz
Sent: donderdag 7 oktober 1999 14:43
To: Lista de EMC da IEEE
Subject:broadband narrowband emissions
Group,
I'd like to have a clear definition of what
to determine a NB emission
is to drop down or increase the measuring BW 1 or 2 steps in a routine EMI
receiver sweep around the emission in a broad span; if the emission remains
constant, it is NB emission. Broad band emissions would drop approx 10 dB
per step change in the bandwidth.
Sweep
-Original Message-
From: Muriel Bittencourt de Liz [SMTP:mur...@grucad.ufsc.br]
Sent: Thursday, October 07, 1999 5:43 AM
To: Lista de EMC da IEEE
Subject: broadband narrowband emissions
Group,
I'd like to have a clear definition of what are narrowband and broadband
Bittencourt de Liz mur...@grucad.ufsc.br
To: Lista de EMC da IEEE emc-p...@ieee.org
cc:(bcc: Robert E. Heller/US-Corporate/3M/US)
Subject: broadband narrowband emissions
Group,
I'd like to have a clear definition of what are narrowband and broadband
emissions. This question may seem very
Group,
I'd like to have a clear definition of what are narrowband and broadband
emissions. This question may seem very plain for many members of
EMC-PSTC, but I always heard/saw this definition for emission and I
still couldn't make them clear to me..
Thanks in advance for your attention
Muriel,
we expereinced similar problems and idetified following phenomenon:
You have a loop consisting of:
PE (outlet) - Power cord receiver - receiver casing - coax cable for
measurement -
-cell casing - PE - PE (outlet).
You'll have some significant HF currents flowing through this loop if
Dear Group,
I'm using a Strip Line Cell (S-Line) from RohdeSchwarz for doing
radiated emissions testing. Using the CISPR 22 limits of frequency
(30MHz - 1GHz), appeared a spurious signal at the frequency of
205,25MHz, and the cell was empty (no EUT inside it)!!
Well, I thought about two
.
Regards,
Ed
From: Patrick Lawler plaw...@west.net
Subject: CISPR11 conducted emissions: add the LISN attenuation?
Date: Thu, 13 May 1999 17:32:18 GMT
To: emc-p...@majordomo.ieee.org
Newsgroups: sci.engr.electrical.compliance
When making CISPR11 conducted
Patrick,
CISPR 11, other CISPR Publications and FCC conducted emissions limits apply
to the EUT port.
LISN insertion loss should be added. In most cases, especially at higher
frequencies correction
for LISN's insertion loss is negligible to the overall test accuracy and
therefore could
When making CISPR11 conducted emissions measurements, should the measured value
be adjusted to accommodate LISN attenuation?
Phrased another way, do the CISPR limits apply to the EUT port or the RF port?
Normally, I'd add the attenuation factor to compensate, but the specification
calls out
Anyone know of a good reference to address conducted emissions problems from
a modulator?
Mat
Mathew Aschenberg
Agency Engineer
EchoStar Technologies Corporation
Englewood, Colorado
(303) 706-5064
(303) 799-6406 Fax
-
This message is coming from the emc-pstc
Jim,
I have been doing some pre-compliance testing using separate biconical and
log-periodic antennae. Most of the time, I am interested in the clock
harmonics and hence, I spot check these frequencies only. I place the
antenna at about 1.5 meters from the EUT at a fixed height of 1 meter.
Please pardon me if the large number of questions at the end of this
e-mail is overdoing it! I'll take as much help with this as I can get!
I'm sure that many of you either went through the stage we're at, or are
still there. We have been trouble-shooting radiated emissions problems
using
a method for using current clamps instead
of open area test sites. There was another thread for an on-site radiated
emissions test when in noisy environments that mentioned using clamp-on
probes.
Additionally I recall and article in one of the trade magazines (Compliance
Engineering, ITEM
Hello Group,
Some time ago (1996) in an email thread on absorbing clamps, Michael A.
Royer stated that CISPR 14 defines a method for using current clamps instead
of open area test sites. There was another thread for an on-site radiated
emissions test when in noisy environments that mentioned
Group,
I am looking for a formula/rule of thumb, etc. for extrapolating the results
of radiated emissions testing on a partially filled cabinet-based product
(e.g. two out of four identical shelves populated) to determine (roughly)
what the entire populated cabinet may produce. I have heard
at different ground potentials and this test
should let you know.
If your screen room supply is not filtered and your AC line is noisy you
should expect low frequency emissions. Install a commercial sample line
filter between inside screen room mains and LISN AC feed, making sure you
place filter
peterh...@aol.com wrote:
Hello group,
I recently carried out a conducted emission in our unlined screen room
with no
EUT connected. I.e just the LISN inside and measuring receiver outside
the
room. I was expecting the plot to be a horizontal line and very low
perhaps in
the region of 10
at different ground potentials and this test
should let you know.
If your screen room supply is not filtered and your AC line is noisy you
should expect low frequency emissions. Install a commercial sample line
filter between inside screen room mains and LISN AC feed, making sure you
place filter
From: peterh...@aol.com
Subject: suspect conducted emissions
Date: Tue, 17 Nov 1998 22:53:20 EST
To: emc-p...@majordomo.ieee.org
Hello group,
I recently carried out a conducted emission in our unlined screen room with no
EUT connected. I.e just the LISN
When doing the cable test, make sure you have a 50 Ohm load on the length
inside to room...
Derek.
-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line: unsubscribe emc-pstc (without the
quotes).
Flinders
EMC Engineer
Emulex Network Systems
(714) 513-8012
randall.flind...@emulex.com
--
From: peterh...@aol.com
Sent: Tuesday, November 17, 1998 7:53 PM
To: emc-p...@majordomo.ieee.org
Subject: suspect conducted emissions
Hello group,
I recently carried out a conducted emission in our
of chamber has been
performed. Emissions measurements (EN55022Class B) are done
in the following manner:
* Product is configured worst case and several measurements are
made at 1 meter.
*A distance factor is added in to determine the limit at 10 meters
and anything within 6dB
Can I ask, please? How do you verify that these support PC's actually
fail to meet class B emissions?
Do you test them when you first remove them from their packaging,
before adding your interface and peripheral?
In my experience PC manufacturers qualify their PC's by creating
the famous
Joe,
Lots of us have the same problem. We always make it a point to isolate the
PC from the test area. Since it is support equipment, we decided I cannot
afford to fix other manufacturer's equipment along with ours, we don't
have either the time nor the resources. Even though we might bring the
-- Forwarded --
From: CollinJJ at USABDMFG
List-Post: emc-pstc@listserv.ieee.org
Date: 11/10/98 3:05PM
To: MartinJP marti...@pebio.com at INTERNET
Subject: Re: Emissions testing with support equipment
EMC Professionals,
Our equipment requires the use of a personal computer to operate.
We sell these PC's with our system. We test radiated emissions as a
system including the PC. We have recently tested PC's from two very
well known PC manufacturers
to store it in.
Good luck.
Gary
-Original Message-
From: MartinJP [SMTP:marti...@pebio.com]
Sent: Tuesday, November 10, 1998 10:25 AM
To: emc-p...@ieee.org
Subject:Emissions testing with support equipment
EMC
Manager
al.patr...@sciatl.com
__ Reply Separator
_
Subject: RE: Indoor vs. Outdoor emissions testing
Author: Flinders; Randall [SMTP:randall.flind...@emulex.com] at IMS
List-Post: emc-pstc@listserv.ieee.org
Date:10-28-98 5:31
From: Flinders, Randall randall.flind...@emulex.com
Subject: RE: Indoor vs. Outdoor emissions testing
Date: Wed, 28 Oct 1998 14:31:17 -0800
To: emc-p...@majordomo.ieee.org emc-p...@majordomo.ieee.org, 'Gordon
Andrews' gordon.andr...@eng.sun.com
Does anyone
in that
range.
They had a quiet open site like yours which was accurate.
From: Steve Kuiper aegisl...@email.msn.com
To: EMC-PSTC emc-p...@majordomo.ieee.org
Subject: Indoor vs. Outdoor emissions testing
Date: Tue, 27 Oct 1998 12:31:59 -0800
X-Priority: 3
X-MSMail-Priority: Normal
X-Mimeole
11:09 AM
To: emc-p...@majordomo.ieee.org
Subject: Re: Indoor vs. Outdoor emissions testing
10 meter chambers can and will become resonate somewhere below 80MHz if
they are not large enough. In order to make them large enough to avoid
this problem you must build a building taller than most
Joe,
Our laboratory was used to compare readings in the low-end, specifically 30
MHz. to 90 MHz. on an OEM product In particular the OEM customer who
maintains 10m indoor anechoic facilities claimed that our customer was
failing the CISPR22B limits by 5-6dB in the above freq. range. After
From: Steve Kuiper aegisl...@email.msn.com
Subject: Indoor vs. Outdoor emissions testing
Date: Tue, 27 Oct 1998 12:31:59 -0800
To: EMC-PSTC emc-p...@majordomo.ieee.org
Joe,
Our laboratory was used to compare readings in the low-end, specifically 30
MHz
I am looking for opinions from group members on the advantages and
disadvantages between a 10m anechoic chamber and a 10m OATS.
All input is appreciated.
Thanks
Joe Martin
EMC/Product Safety Engineer
P.E. Biosystems
marti...@pebio.com
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