I read in !emc-pstc that lcr...@tuvam.com wrote (in 3187EE460C488A458D4
dc186f40edc21049...@exchdan.us.tuvworld.com) about 'Sound Engineering
Practice', on Thu, 6 Sep 2001:
I am struggling with one of those darned European directives, the pressure
equipment directive. One aspect of conformance is
I read in !emc-pstc that Meunier, Éric eric.meun...@ca.kontron.com
wrote (in 5009AD9521A8D41198EE00805F85F18F0134036E@SEMBO111) about
'STP vs FTP Ethernet cables (2)', on Thu, 6 Sep 2001:
You may want to check if the FTP cable has a 100 Ohms characteristic
impedance which would make it compatible
I read in !emc-pstc that Chris Maxwell chris.maxw...@nettest.com wrote
(in 83d652574e7af740873674f9fc12dbaa675...@utexh1w2.gnnettest.com)
about 'ENV 50121-5', on Thu, 6 Sep 2001:
The thorn is... I believe that the at least the scope statement of any
standard should be public information that
Hi Lauren:
Does anyone have a practical or authoritative definition of Sound
Engineering Practice?.
The key word is sound. Presumably we all know
what engineering practice is.
I checked Merriam-Webster's on-line Collegiate
Dictionary and found the following definition.
The 3rd
For Ethernet ports you may also want to consider the high-voltage isolation
requirement specified in the IEEE-802.3 Ethernet specification. I found that
Ethernet isolation is usually not required as part of the EN60950
certification process but it may be a good safety feature to consider and
can
I am struggling with one of those darned European directives, the pressure
equipment directive. One aspect of conformance is dependent on the
application of Sound Engineering Practice.
Does anyone have a practical or authoritative definition of Sound
Engineering Practice?.
It's and idea that
Hi John,
I agree with your view; which I understand to be.
1. Nobody can paraphrase an entire standard in a email without huge
chances for error... and
2. A company should buy the standard if they plan on using it.
This reminds me of a thorn in my side which I hope will get the
attention of
Not sure if this is germane to the list, but...
Many newer fluorescent fixtures use an electronic ballast -- they use a
switching converter or flyback to develop the high voltage required for the
bulbs (laptop backlight elements work the same way). Apparently this
reduces the amount of iron
Good People of EMC-PSTC
Sorry for the OT question.
Global said that EIA-196 (Fixed Film Resistors) is dead; but there is
nothing to replace this standard. What standard has superceeded 196?
thanks much,
Brian O'Connell
Taiyo Yuden (USA), Inc.
---
Other standards with immunity testing above 1GHz:
1. IEC 60533 (1999-11): Electrical and electronic installations in ships -
Electromagnetic compatibility
2. Some of the ship classification societies (DNV)
In both cases it is immunity testing up to 2GHz.
3. ...and of course the MIL-STD
Chris,
Fluorescent tubes are noisy anyway, but the old passive ballasts are
starting to be replaced with active electronic ballasts. Those electronic
widgets actually run at frequencies down near what you're using.
Electrically they can be EXTREMELY noisy. The US has no real restrictions.
As
No, EN301 489-1 specifies RF immunity from 80MHz-1GHz
with the exception of the exclusion band for
transmitters, receivers and duplex transceivers, see
Clause 9.2 of EN 301 489-1 (2000-08). There is no
indication that up to 2GHz be required.
Leslie
--- umbdenst...@sensormatic.com wrote:
I
Hi Chris,
We have discovered that at least one fluorescent light product line has a
circuit that operates at 34 kHz. Use or make a loop antenna and sniff your
suspect area with your spectrum analyzer; then you will know for sure what
the interfering frequency and source is.
Good luck,
Don
The LVD contains the following exclusion:
Specialised electrical equipment for use on ships, aircraft or
railways, which complies with the safety provisions drawn up by
international bodies in which the member States participate.
Specifically with reference to railways, does anyone know
I agree that the 4-3 is a basic standard. EN 301489-1 is an immunity
standard for radios and specifies the 2 GHz upper limit. As the foundation
is established in the basic standard and there is a proliferation of
personal communications devices, it would not surprise me to see other
standards
As previously noted, the new revision of EN 301489-1(EMC for radio) does
increase the range to 2 GHz and does reference EN61000-4-3. It appears to be
the first product/family standard to do so. Will shall see if others follow.
Richard Woods
--
From: Pettit, Ghery
I read in !emc-pstc that Chris Maxwell chris.maxw...@nettest.com wrote
(in 83d652574e7af740873674f9fc12dbaa675...@utexh1w2.gnnettest.com)
about 'Noise from flourescent light ballasts?', on Thu, 6 Sep 2001:
I was wondering if flourescent light ballasts could be giving off an
emission in the KHz
The question that would then arise is this - what standard using EN
61000-4-3 calls out immunity testing above 1 GHz? EN 55024:1998 for ITE
does not, nor does CISPR 24 upon which it is based. Unless a standard using
EN 61000-4-3 as a test method requires immunity testing above 1 GHz, the
added
We have experienced noise from variable frequency motor controllers used in
air conditioning systems. There may also be some of these controllers in
your factory controlling conveyer belts and other machinery.
Richard Woods
--
From: Chris Maxwell
Bob,
EN 301489-1 due in 2003 calls for radiated immunity testing to 2 GHz.
EN61000-4-3 also indicates testing to 2 GHz due to the portable phone
market.
Best regards,
Don Umbdenstock
Sensormatic Electronics Corporation
--
From: rehel...@mmm.com[SMTP:rehel...@mmm.com]
Sent:
Hi all,
We have personally experienced an interesting phenomenon. We build a
certain circuit that detects a 20Khz tone. This circuit is housed in a
product that has an EMI spray coated case. One of our engineers noticed
that our techs on the manufacturing floor were having a difficult time
Dear All,
Does anyone have a Clearance/Creepage Tables for primary supply voltages (up
to 300 Vac) for a Installation Category III (equipment used for outdoors)
per UL60950 (which refers you to IEC 664). IEC 664 is quiet heavy for my
already tired eyes and I am sure one of you outdoor equipment
ENV 50121-5 Fixed Power Installations for Railway Applications
http://www.yorkemc.co.uk/Technical/Tins/tin6.htm
John Juhasz
Fiber Options
Bohemia, NY
-Original Message-
From: Biggs, Daniel (IndSys, GEFanuc, NA)
[mailto:daniel.bi...@gefanuc.com]
Sent: Thursday, September 06, 2001 9:59
We have recently purchased an Amplifier Research Model 25SIG4A and we use
an
AR FP2080 probe. We have two antennas for that range, a Schaffner bilog and
an
A. H. Systems horn.
Other than the upcoming 60601-1-2 for medical equipment, are there any
other upcoming
standards that call out immunity
I read in !emc-pstc that Peter Merguerian pmerguer...@itl.co.il wrote
(in 2D1037012914D4118DB8204C4F4F50202D5DC2@ITLLTD01) about
'Installation Category III; UL60950', on Thu, 6 Sep 2001:
Does anyone have a Clearance/Creepage Tables for primary supply voltages (up
to 300 Vac) for a Installation
I read in !emc-pstc that Biggs, Daniel (IndSys, GEFanuc, NA)
daniel.bi...@gefanuc.com wrote (in A9713061F01AD411B0F700D0B746CA6801
550...@vacho6misge.cho.ge.com) about 'ENV 50121-5', on Thu, 6 Sep 2001:
I am looking for a short description of ENV 50121-5.
What does it cover?
Railway
Hi Folks
Here are the URL's for the EC Commission Enterprise Websites for the lists
of national implementations of the directives listed below:
General site URL:
European Commission Enterprise Site
http://europa.eu.int/comm/enterprise/site-map.htm
This leads you on the following URL's which
I am looking for a short description of ENV 50121-5. What does it cover?
What tests does it specify? What limits does it specify for tests?
Thanks,
DB
---
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc
I agree with Paolo, the definition refers to a shielded TWISTED-PAIR
cable. Note also that twisted pair is hyphenated. While the definition
might better have been worded to refer to 'one or more TWISTED-PAIRS,
each of which...' rather than 'elements' it is not difficult to argue
that the
Hi Don,
From my time at a test laboratory, I recall we used an amplifier from Milmega.
It was a 55W amplifier. It worked very good.
Check out this one http://www.milmega.com/1080.html
For field monitoring, we used the Amplifier Research field probe FP2080. Check
out
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