Hi David
In my experience that is just a little too short. The smallest chamber I'm
familiar with that would satisfy 61000-4-3 (80MHz -1GHz) is 7L x 3.4W x 3 H
meters. This size is usually called a "compact" anechoic chamber. It can
also be effectively used for pre-compliance of emissions testing!
Regarding your new VCR problems! The one thing you said that makes the
least "technical sense" is that "This was, of course, true even when the
VCR was turned off."
When a VCR is turned off, the RF signal from your cable is switched
directly to the output RF cable that goes to your TV cable input.
Hi Bill et al
If you scroll past the message and look at the last line of the "This
message is from the IEEE EMC Society Product Safety Technical Committee
emc-pstc discussion list.PSTC " header on every e-mail posting--you will
see the following!
>All emc-pstc postings are archived and searchabl
Hi KC
Schaffner EMC makes these testers. (Surge tester for 3-phase product.)
If you access their web at www.schaffner.com you will find product info and
lists of different country contacts!
Regards
Tony
Colorado
---
This message is from the IEEE EMC Society
Schaffner EMC Makes this equipment.(for EN61000-3-2/3) Go to their web site
at www.schaffner.com. Or you can call Schaffner Western Region in Cal at
949-653-7148
Tony
Colorado
>Does anybody know which equipment is available here in the US to do this
tests after Agilent decided not to continue the
Hi Kevin
Antennas that have a significant length, and construction, such as a wide
band Bilog made by Schaffner/Chase, are marked where their centers are and
that is where all range distances should be measured from! It is my
understanding that this phase center is a compromise as it "moves" for
d
>I am in need of a 2.45 GHz signal generator. I know that Agilent and
Gigatronics make them. Anyone else?<
Yes, IFR systems aquired Marconi Instruments in Feb 1998. Marconi SG's are
very popular in EMC sites!
IFR's web is www.ifrsys.com
Tony
Colorado
---
T
Hi Joe
Schaffner makes a wide range of CDN's including a CDN-T2. I do not know if
it' s also useable for EN 55024 but it does have a higher frequency
performance IE to 230MHz.
I would suggest you contact John Parnell at Schaffner 800-367-5566, or
e-mail him at jparn...@schaffner.com
Tony
Colora
Hi Ken
I would like to alert you to a few issues regarding your request for info
on cost of a 3-meter anechoic chamber!
First you need to define what you mean by "3-meters" or better yet, what
you want to achieve with the chamber! If you just want a minimum size
chamber, with a 3 meter range dista
You are quite right! It is particulary important to realize that an actual
Electro-Static discharge is not necessary to cause damage to circuits
inside a pink poly bag. For example, if a person is highly charged from
static but only goes near the bag and there is no actual "zap" - even the
Electro
Try INTERMARK (Kitagawa) at 212-629-3620 or www.intermark-usa.com
They have some surface mount chip ferrite beads that are 3A and typically
1300 Ohms at 60MHz and are 1.3 mm high (IM-HH-1M4532-132). They also make
6A parts.
Tony O'Hara
LARCTEC Marketing
Colorado
< I am looking for a 10 uH power i
Just for clarification, Kitagawa and INTERMARK (which has already been
identified as a maufacturer of Ferrite IC pads) are one and the same
companies. In USA use INTERMARK-21-629-3620 or www.ingress.com/~im-usa
Tony O'Hara
LARCTEC Marketing
Colorado
INTERMARK USA at 212-629-3620 makes these.
Web is www.ingress.com/~im-usa
Tony O'Hara
LARCTEC Marketing
Colorado
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This message is coming from the emc-pstc discussion list.
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with the single line: "unsubscribe emc-pstc" (without t
I have complete polar diagrams on the CBL6141 (compact X-wing) but not the
CBL6140.
Call Joe Hiens - Schaffner/Chase at 800-367-5566 x253 I'm sure he can get
them for you!
Tony O'Hara
LARCTEC Marketing
Colorado
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This message is coming from the emc-pstc discussion list.
To cancel your subs
Ok. Not as complex as I thought-in the TV! It sounds like "simple" RF
interference through the antenna. However, I have just tried shaking the
"coins in a baggie" at my computer monitor - nothing! Now at a 24 year old
TV on wire antennas in my basement. I got nothing at VHF frequencies (54MHz
to 21
Rene, That is an interesting phenomenon! If you could give me a more
detailed description of the TV "distortion" and "black lines" I might be
able to explain at least what was happening inside the TV set (I worked
many years in TV R & D). This in turn might help others to explain what ESD
or EMI ef
Here is further info on the EFT DC blocking capacitor use by Schaffner
generators. It seems there can be 2 capacitors (in series) which is
probably why the confusion started in the first place! Hope this clears it
up!
Tony (Colorado)
To the EMC Discussion group, freom greg Senko
Perhaps my last
intro emc-pstc
---
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.
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majord...@ieee.org
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For help, send mai
Sorry this is a little late, but it is Schaffner's official response to the
recent question from Antonio Cinquino Re: EFT DC blocking capacitor on Dec
5th.
{Posted by Tony O'Hara 12/11/2000, LARCTEC Marketing, Colorado]
Re: EFT DC blocking capacitor question from Antonio Cinquino
To the EMC Dicu
This is being posted for Schaffner, EMC Inc.
Please respond to Greg Senko, 603-642-4694 or e-mail at
gse...@schaffner.com
SCHAFFNER EMC, INC.
Schaffner offers the world's largest range of EMI filters, EMC
instrumentation and test systems for radiated and conducted interference,
and advanced powe
A modulator for PAL is different than NTSC! PAL receivers use different
frequencies and I also think there are other differences!) . However, I
would assume that if you're in a locality that has PAL receivers then you
should be able to easily get a PAL modulator.
Remember also, that most "new" (la
Try Schaffner components. They have a large range of powerline filters,
feedthough capacitors, and chokes and can supply custom ones to suit any
need at a reasonable cost!
Their web is www.schaffner.com.
Tony
Colorado
---
This message is from the IEEE EMC
You may want to look at using a PCB Electromagnetic Scanning System! One
of the advertised uses for these test devices is for quickly comparing EMC
performance when component changes are made etc.! I believe there are 4
different manufacturers who make these devices. The one that I'm just
startin
"It's only software!!"
Seems like the report from the JPL Special Review Board on the Loss of the
Mars Polar Lander blames the software!
They clearly state (section 7.7.2 in pdf file #4) that "The touchdown
sensors characteristically generate a false momentary signal at leg
deployment. This beha
Sorry, my original posting may have misled those who have asked for more
info. The e-mail I was refering to is simply the press release and has
little more technical info.
However, I do now have a copy of the complete NASA report! It is in 5
separate PDF files each 400k-500k. This has LOTS of inf
>Tony,
I don't think it was actually EMC. The report I saw on CNN said the legs
opened with a "jolt", fooling the sensors which were supposed to cut the
retro rockets when they detected the shock of landing.
Scott Lacey<
It looks like Scott Lacey is right, thank you! I made the assumption that
"s
Hi
I thought many people would be interested in this as it looks like the
recent NASA Mars Lander loss was due to EMI/EMC problems!
I have just extracted a small piece of the e-mail report I got! Contact me
directly if anyone wants the entire e-mail.
<>
Tony
Colorado
---
Although I am also a sales rep (and an engineer!) I agree with the fact
that a preamp and or pr- selector can make a considerable improvement to
the SA's performance. Schaffner/Chase's preselector was designed especially
to work with all SA's and particularly the Advantest.
But, you might also wa
Hi Dave
Here is probably more than you ever wanted to know about dBu. It is
extracted from the book "Audio Precision Audio Measurement Handbook." Audio
Precision is the world's leading manufacturer of precision audio measuring
and test equipment.
There is also a rather lengthy page discussion on
Hi Chris
Indeed, your comments (copied below) may well be happening now, at least in
the US!
>I applaud the activities of the Politically Correct, Environmental police,
Nature preserving amongst us, but I sometimes wonder if their enthusiasm is
insufficiently tempered with a longer term view, or
I have seen carpet, vinyl and wood used to cover ferrite absorber. I would
recommend using a thin plywood/paneling such a 1/8'. As far as wood
containing moisture is concerned, as an amateur wood hobbyist from way
back, I know that the moisture content in wood will gradually adjust to its
location
Schaffner/Chase makes a set of 2 tuneable dipole antennas 30Mhz to 300MHz &
300MHz to 1GHz.
You can contact them at web www.schaffner.com or 973-379-7778
Tony
Colorado
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As far as Schaffner is concerned, see Page 12 of their new EMC products
catalog (690-505A/6/98) concerning their emCell.
If clearly says; under Emission testing "TEM-Cell products have limited
applicability to radiated testing, as it is very difficult to correlate
near-field measurements with far-f
Hi
We need your help!
One of the tasks of the Denver 1998 International Symposium on EMC
organizers is to provided meeting rooms during the symposium for various
committees. We are presently trying to contact everyone who leads such a
committee in order to confirm details of their requirements and
Hi Brian
I am forwarding this response by Chase EMC as they have been having
problems axcessing this system! Hope it helps!
Message:
1000-2-6 is simply trying to provide a repeatible method for radiated
immunity testing at frequencies below 80MHz. Becasue of the problems
associated with low freque
Hi Jeff
If you're having a problem with ambient noise, you need a shielded room
first! A steel shielded room will isolate your EUT to about
-100dB from 200kHz to >20GHz. The foam or ferrite is then added to prevent
internal reflections/standing waves. But foam and or ferrite will only
absorber RF
Hi Richard
Schaffner-EMC has both RF far-field E & H isotropic probes and near field E
& H probe sets. Their EMC-20, used typically for immunity E-field
measurements in V/M or W/M squared, measures from 100kHz to 3GHz, with
0.01V/M resolution and can be used stand-alone or via fiber optic.
They a
The "standard" anti ESD wrist strap used by electronic assemblers etc. to
avoid electrostatic build-up on their bodies also has a resistance of about
that value (1 Mohm) to ground.)
This resistance value is chosen as a compromise to be both low enough to
prevent ESD build up, but also to be high e
Wandel & Goltermann make magnetic field monitors with A/m units as a
selectable choice.
I believe you can get info at Chase Systems 973-252-6605
Tony
Colorado
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with the
MEB is now owned by Schaffner. Schaffner's web site is
MEB still has there own separate web at with lots of GTEM
info.
Tony
Colorado
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with the single line: "unsubscri
Sorry I'm a few days late in responding to the previous thread on this
subject, but I delayed in order to re-check my data before posting this as
the last time this topic was discussed (August 99) it seemed to be quite
controversial! However, I have a concern that some of the recent postings
regar
The FCC allowed GTEMs to be used as an alternative test site for making
radiated emissions measurements under Part 15 of the FCC rules on Dec 2
1993 via public notice #40830.
Regarding "correlation measurements": this Public Notice states that
"Acceptable comparison data must be filed with the C
Re:How to measure the absorption characteristics of the carbon-impregnated
foam pyramids?
This is a very difficult measurement to make! Dr. Robert Johnk at NIST
(National Institute of Science and Technology) in Boulder, Colorado has
recently developed a new method of doing this. He can be contacte
Hi Nezam
Schaffner/Chase makes a complete Pre-compliance emissions measurment system
called a EMIPAK. You may contact them at 973-379-7778 or visit their web
site www.schaffner.com. They also can supply GTEM cell systems so that
ambients are eliminated.
Tony O'Hara
LARCTEC
Colorado
-
Th
Hi Mike
Regarding the Chase (now Schaffner EMC!) immunity & emissions posters
(there are now one of each!) your local Schaffner EMC Test & RF products
representative should have them. If you need to, you can find out their
phone etc. by visiting Schaffner's Web site at www.schaffner.com.
Regards
T
Hi Ray
Try Panashield for a shielded room or anechoic chamber.203-866-5888 x14 -
Web www.panashield.com
Also contact Schaffner for any needed equipment- 973-252-8001 - Web
www.schaffner.com
Tony O'Hara
LARCTEC Marketing
Colorado
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This message is coming from the emc-pstc discussion list.
Hi Derek
Sorry, but I feel compelled to provide another point of view-about US
products failing! I came to the US more than 30 years ago and quickly
subscribed to Consumer Reports, which I always use as a guide to buy just
about any appliance. Perhaps, as a consequence, I have had a totally
differe
In Test & Measurement Europe magazine (May 1997) there is a good article by
David Marsh titled -Test Cells Monitor Immunity or Emissions-which covers
using small test cells for immunity testing. Different manufactures are
discussed and a table is shown with manufacturers basic specs etc.
Hope this
Naftali Shani asked about web sites.
I don't know if there is a web site available for Test & Measurement Europe
mag. Maybe someone from UK knows (I think that's where they are!)
The companies listed in the article are Chase EMC, Comtest, MA Instruments,
Rohde & Schwartz and Wayne Kerr. I only know
Jim Eichner asked if I had subscription inf. etc. for the mag. Test &
Measurement Europe. I'm afraid I don't, only the pages of the article were
mailed to me, by Chase USA! However, my previous e-mail asked for help
here, and I have now noticed that the article's author David Marsh, can be
contact
Hi all,
As the Local Arrangements Chair of the organising committe for the IEEE
1998 International Syposium on EMC to be held in Denver, Colorado I am
interested in any feedback from those who attended last weeks 1997
symposium in Austin. The Austin Symposium was great but we plan to be even
great
Hi Max
YouAsked
<>
Why not just use a precision voltage divider, and then feed the reduced ac
voltage to your A/D. If you need only positve voltage, then couple into the
A/D with a capacitor and add a precise DC offset voltage.
<>
Probably not the best way to do it!
<>
I am not a safety engine
Hi Richard:
Regarding your personal preferences on User-Friendliness of standards-I
couldnt agree more!
What you are asking for applies to ALL technical writings/publications.
The first task of a technical writer (at least a good one!) should be to
analyze the user:-
Who is basically reading/usin
Naftali Shani asked about web sites.
I don't know if there is a web site available for Test & Measurement
Euro=pe
mag. Maybe someone from UK knows (I think that's where they are!)
The companies listed in the article are Chase EMC, Comtest, MA
Instrument=s,
Rohde & Schwartz and Wayne Kerr. I only kn
There are some definite problems with using attached files! Internet
communications (due to it's old origins) can only transmit ASCII (7 bit
text) files. Files such as WORD, tif etc. are Binary and must be encoded
(converted) into ASCII files before sending and then decoded after sending.
Some gate
Hi All
Here are the results of my test to see who could handle a SMALL attached
file encoded in MIME. First let me thank all the people who responded.
There were (to date!) 52 replies.
Although there was 3 "strange" replies-2 were messages they were "out of
the office" (Is this automatic?)
The ove
9/17/97
This is a SUMMARY OF INPUTS ON AUSTIN SYMPOSIUM
Thanks to all the people (14) who responded to my request for feedback on
the 1997 IEEE EMC Austin Symposium. Below is a summary of the recurring
comments. (Note:- These comments are also somewhat prejudiced from other
sources, particularly t
As someone has already noted, Wandel & Goltermann make a number of
different hand held RF radiation monitors including a state-of the-art
personal RF safety monitor. In the US these are available from Chase
Systems at 973-252-6605.
Tony O'Hara
LARCTEC Marketing
Colorado.
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