This reminds when EMC immunity testing first came out while
I worked at another company. No one knew exactly what to
expect. So we made our own ESD tester with a TV flyback
transformer connected to a variac connected to the AC mains
line. The thing could kill you.
We could go above 15K
Shake,
The FCC has a process for modules that does not necessarily require
re-approval. The module must meet certain conditions and the Grant
(approval) must contain the word module or modular in the notes section
of the Grant. This is explained in FCC public notice DA 00-1407 released on
June
I read in !emc-pstc that Stuart Lopata stu...@timcoengr.com wrote (in
002e01c124e5$aadceac0$1301a8c0@newberry) about 'TCF for EMC
directive', on Tue, 14 Aug 2001:
Does anyone know of any good information on how to make a technical
construction file (TCF) for the EMC directive? My
Stuart,
The Directive itself stipulates what must be contained in the TCF and the
Guidance notes go into greater detail. Attached please find website for
Guidance Notes.
http://europa.eu.int/comm/enterprise/electr_equipment/emc/guides/english.pdf
Do not rely on the word of some vendor employee with
regard to the safety criteria of the power supply.
Carefully read the CoA for that power supply.
If the CoA states compliance with the pertinent
standards as a Class I device, then there's nothing
you can do.
- Doug McKean
You can find the information at
http://europa.eu.int/comm/enterprise/electr_equipment/emc/index.htm
http://europa.eu.int/comm/enterprise/electr_equipment/emc/index.htm
Look in the guidelines.
--
From: Stuart Lopata [SMTP:stu...@timcoengr.com]
Sent: Tuesday,
Nice e-mail 'schematic' !!
That's a first . . . for me!
John Juhasz
Fiber Options
Bohemia, NY
-Original Message-
From: Rich Nute [mailto:ri...@sdd.hp.com]
Sent: Tuesday, August 14, 2001 12:37 PM
To: dpie...@openglobe.net
Cc: emc-p...@majordomo.ieee.org
Subject: Re: Hot Chassis?
Does anyone know of any good information on how to make a technical
construction file (TCF) for the EMC directive? My company is working on
obtaining its CAB certification neccessary to provide our customers with a CE
mark.
Stuart Lopata
Compliance Engineer
Timco Engineering
Dan
First thing, if the power supply is not double insulated, i.e. marked with the
square within the square, and is instead Class I Equipment, then forget what
the manufacturers has told you, that ground line forms an essential part of the
basic protection against electric shock. Do not by pass
As I recall, our facility (IBM at the time) first dealt with field ESD issues
long before there were the present FCC EMI rules for digital devices.
This was back in the '60's.
At the time we made typewriters, some with internal magnetic cards for
storing typed documents. In low humidity
Title: EN61558 60742
Good People of the PSTC group:
Does anyone know the last date of mfr under EN60742?
Has EN61558 completely superceded EN60742 for iso xfmrs?
thnx much,
Brian O'Connell
Taiyo Yuden (USA), Inc.
---
This message is from
Hi Dick,
I recently completed a radio investigation for Egypt. there is an
organization there called Egyptian Telecom that answered my radio questions.
not sure if they also handle Telephony stuff. Name would seem to indicate
they do. Fax Number I have is +(20)2-738-3260.
I have another
Hi Dan:
with a three prong NA cord set. I have found that if I bypass the earth
ground plug I can measure a 80 VAC potential from my chassis to earth
This is normal.
Consider the circuit:
L o- 120 V rms
|
|
2200 pf
Hi Dan,
Are there actually 2x2200uF capacitors (Y) connected from AC mains IN to your
chassis?!!!??!? If
these values are indeed correct, the resultant leakage current would be about
100A @ 120Vac 60Hz. I
find this highly questionable. Are these capacitor values actually 2200pF.
This is
Richard,
We have gone as high as 20kV. This was done on the control panel with
buttons similar to that of your common vcr remote. It was done as a customer
requirement. We used the same pass/fail criteria as if it were at 8kV.
We use a Schaffner NSG431.
Regards,
Josh
-Original
The following doesn't directly address the issue of product
robustness, but I'll pass it along anyway.
My company makes power supplies for use in medical equipment, and
some of our customers test to IEC60601-2-24 (safety EMC for
medical infusion pumps). This standard requires 15kV air
Some of the offices have very nice 10 meter semi-anechoic chambers -
some are tents. So its like picking any oats if they meet your schedule and
cost objectives. Don't know what their troubleshooting capabilities are if
you get into trouble though.
Gary
-Original Message-
I read in !emc-pstc that Richard Silvernail rsilvern...@octavecomm.com
wrote (in 1693990345F95B4097152E25B4B38F9732EDAA@octexchange.nexussyste
ms.net) about 'Egypt Telecom', on Tue, 14 Aug 2001:
Does anyone have a fax number or other contact information for Egypt
Telecom?
They are not on the
I read in !emc-pstc that Michael Mertinooke mertino...@skyskan.com
wrote (in 001301c124ca$020ec280$1a00a8c0@mikem) about 'Hertz
Vibration?', on Tue, 14 Aug 2001:
Still sounds like a stupid bit of pseudo jargon to me.
Like 'Hourly time' or 'Gallonic volume.' It's just wrong.
Tautological, like
I currently have a 110/220 power supply that has several 2200UF capacitors
tied to FGND two of which are tied to the AC lines in. This supply comes
with a three prong NA cord set. I have found that if I bypass the earth
ground plug I can measure a 80 VAC potential from my chassis to earth
Hello Dick and others,
You can find this kind of information on:
http://www7.itu.int/treg/Regulators/RegAddress.asp
Best regards
Helge Knudsen
Test Approval manager
Niros Telecommunication
Hirsemarken 5
DK-3520 Farum
Phone +45 44 34 22 51
Fax +45 44 99 28 08
email h.knud...@niros.com
I found quite a lot of references via Google, to 'Hertzian
Vibration.' A lot of them made reference to contact
closure types of equipment. By inference, it seems to
be used in relation to low-frequency mechanical vibration.
Still sounds like a stupid bit of pseudo jargon to me.
Like 'Hourly
Do any of you perform ESD testing at or above 15 kV to improve product
robustness? I have the following questions.
o What types of products
o What type of user environment
o What is the rational for testing above 15 kV
o What test equipment is used above 15 kV
o
From: Douglas Beckwith@MITEL on 08/14/2001 08:53 AM
Hello Kim,
I believe NEMKO could help you. They have a very strong presence in North
America. Nemko Canada and are fully accredited by the FCC and IC. The person to
contact is Russel Grant at Nemko Canada (rgr...@nemkoca.com) and he will be
You may want to look at http://www.telecomegypt.com.eg/
Rolf Schaefer
-Ursprüngliche Nachricht-
Von: Richard Silvernail [mailto:rsilvern...@octavecomm.com]
Gesendet: Dienstag, 14. August 2001 12:31
An: 'emc-p...@majordomo.ieee.org'
Betreff: Egypt Telecom
Hello Group.
Does anyone
Yea, UL has an EMC test lab.
Richard Woods
--
From: geor...@lexmark.com [SMTP:geor...@lexmark.com]
Sent: Tuesday, August 14, 2001 7:49 AM
To: Kim Boll Jensen
Cc: EMC-PSTC (E-mail); TREG (E-mail)
Subject: Re: North American test house
You can find the frequency allocations and other rules in CEPT
Recommendation 70-03 which can be found at
http://www.ero.dk/eroweb/SRD/srd.htm http://www.ero.dk/eroweb/SRD/srd.htm
--
From: Divina Ng [SMTP:divina...@pfhongkong.com]
Sent: Tuesday, August 14,
Underwriters Laboratories (UL) owns DEMKO. You may be able to use the
DEMKO / UL connection to your advantage. However, I am not sure that UL
does any EMC testing / verification.
George
Kim Boll Jensen kim.jensen%eicon@interlock.lexmark.com on 08/14/2001
04:34:26 AM
Please respond
Hello Group.
Does anyone have a fax number or other contact information for Egypt
Telecom? Our product is ISDN equipment.
Thanks in advance,
Dick Silvernail
Octace Communications
rsilvern...@octavecomm.com
---
This message is from the IEEE EMC
Hi all
I need URGENTLY a test house in North America which will accept a Danish
accredited test report for a Bluetooth product for FCC and IC approval.
The Danish test house is accredited my national government and have just
applied for FCC approval concerning Bluetooth but we can't wait for
Hi all,
Do anyone of you have a link to a web which describes the fundamental
differences between air- and contact discharge ? or a common ESD web-site ?
I am aware of http://www.esda.org
Best regards
Amund Westin, Oslo/Norway
--
Get your firstname@lastname email for FREE at
I read in !emc-pstc that Divina Ng divina...@pfhongkong.com wrote (in
C7C2C633D22DD5118E54000629D54B932CB384@EXCHSVHK) about '', on Tue, 14
Aug 2001:
We have a wireless radio microphone using a 100MHz radio frequency that was
previously tested for US Market. Is there anyone one can advice if this
I read in !emc-pstc that Electrical-Safety - Bill Addiss
b...@electrical-safety.com wrote (in 4.3.2.7.2.20010813200204.00d9f18
0...@mail.readyconnect.net) about 'Hertz Vibration?', on Mon, 13 Aug 2001:
Has anyone heard the term Hertz Vibration ?
A friend had heard the term in a conversation
Dear Fellow Members,
We have a wireless radio microphone using a 100MHz radio frequency that was
previously tested for US Market. Is there anyone one can advice if this
product is applicable to European Market (planned for UK). What is the
testing standard required?
Thanks for your attention
Bill Addiss wrote:
Has anyone heard the term Hertz Vibration ?
A friend had heard the term in a conversation somehow related to Circuit
Breakers.
I'm trying to help find the pieces to his puzzle.
If this is a valid term, is there any info/papers on it We could read?
Must be something
It's likely a term used to describe the mechanical vibrations that you hear
in a magnetic circuit breaker as the current it is carrying increases past
its trip current. I've heard this noise, but not the term Hertz
vibration. However the name makes sense - the vibration would be at line
Bruce,
Heard that one already, I just got it now though !
:)
At 05:34 PM 8/13/01 -0700, Bruce Touzel wrote:
sounds like a bad rental car experience
Electrical-Safety - Bill Addiss wrote:
Hello!
Has anyone heard the term Hertz Vibration ?
A friend had heard the term in a conversation
sounds like a bad rental car experience
Electrical-Safety - Bill Addiss wrote:
Hello!
Has anyone heard the term Hertz Vibration ?
A friend had heard the term in a conversation somehow related to Circuit
Breakers.
I'm trying to help find the pieces to his puzzle.
If this is a valid term,
Hello!
Has anyone heard the term Hertz Vibration ?
A friend had heard the term in a conversation somehow related to Circuit
Breakers.
I'm trying to help find the pieces to his puzzle.
If this is a valid term, is there any info/papers on it We could read?
Thanks in advance for any help
Bill
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