Hello Ahmad,
Our chamber installer suggested rolls of white refrigerator magnets.
This has been used in some major installations with the customer's logo
applied. As it is magnetic material, not part of the original installation,
I suspect that it would have some impact, perhaps a wash in the
Been down this road already on the indirectly connected and its so
vague as to be non-sense.
My favorite example is a pair of earphones on my PC.
The earphones plug into the speaker, the speaker plugs into my PC. The
PC also happens to have a modem, and if fact I can use
I read in !emc-pstc that White, Ian ianwh...@spiraxsarco.com wrote (in
DE5AB3E5A2E9D6119B0F000802B2762630EB8D@UKCHEEX01) about 'EMC
retesting' on Wed, 4 Dec 2002:
Over the years l have read many articles on how to EMC test products but
none giving guidelines how often you should re-test a product
I read in !emc-pstc that Luiz Claudio Bonilla de Araujo
luizboni...@ig.com.br wrote (in 200212040852.gb48qgs17...@orion2.ieee
.org) about 'IEC 417 Protective Earth Symbol' on Wed, 4 Dec 2002:
I have a doubt concerning IEC60335-1, paragraph 7.8, which is reproduced
below:
7.8 Except for TYPE Z
Hi Michael,
Cadmium is one of four heavy metals which will be banned by the middle of 2006,
these are listed in the Restriction of Hazardous Substances (ROHS) Directive.
You can see the draft at this link:-
http://www.dti.gov.uk/support/summary.htm
Regards,
Dave
Michael Taylor
***NEWSFLASH*** - KTL Launch New Website!! - Visit us at http://www.ktl.com
I think a Voice over IP is within the scope of the RTTE due to the following
definition in the RTTED :
Under Article 2(b) of the RTTED, telecomms terminal equipment is defined as
a product enabling communication or a
Hi Amund,
Some equipment types falling under Parts 15 and 18 do not require
certification; most notably would be Part 15 Subpart B Unintentional
Radiators, the list of how those devices are treated under the Equipment
Authorization requirements may be found in the pdf attachment. A recent
Wesin:
Your statement indication there is no need for FCC Certification for
equipment under 47CFR Parts 15 and 18 are incorrect.
There are many devices covered under Part 15 that will need
Certification, and this is not limited to just Sub-parts C, D, and E.
Certain Un-intentional radiators need
All -
My reading of the RTTE indicates that it does indeed apply
to an IP telephone. Please refer to the below, paying
particular attention to the use of ...indirectly by any
means whatsoever...
Article 2
Definitions
or the purpose of this Directive the following definitions
shall apply:
I must admit to finding earthing terminology confusing, probably because
I get involved with it on an infrequent basis. Reference is generally
back to EN 60950 to check. I don't have a copy of EN 60335 but would be
surprised if it was really different from EN 60950.
The Protective Earth
Do IP phones use a different method for ringing the phone? Analog
phones hit around 90 v on the ringing circuit which puts it into a TNV-2
category not SELV. Not sure that it really matters for the discussion, but I'm
curious about how they ring.
Gary
-Original
Neven -
While there may be some reliability concern, as John
Woodgate pointed out, it's not much of a safety issue, if
the product has also been subjected to a few of the same
tests normally applied to a TNV circuit. Referencing
IEC60950-1 and assuming the IP telephone is on-premise and
thus
Does anyone happen to know the regulation citation covering the EU - NiCad
ban.
Thanks in advance.
Michael Taylor
Hach Company
We placed a lighter colored wall covering on ours. We went to the tile
manufacturer and asked them for their approved materials, process, etc. and
then the company that built our chamber applied it.
Bob Heller
3M EMC Laboratory, 76-1-01
St. Paul, MN 55107-1208
Tel: 651- 778-6336
Fax:
As far as I understand, there are no needs for FCC certification for
equipment covered under FCC Part 15 and 18. But if the equipment is a radio
transmitter and are covered under other FCC parts 80, 87, etc, certification
applies. Correct ?
From the FCC Web, a list of all test firms exists.
Hi
Over the years l have read many articles on how to EMC test products but
none giving guidelines how often you should re-test a product once the
product has been in production for a number of years. Usually the problem
does not arise as design changes etc trigger a re-test programme. However
Dear all,
I have a doubt concerning IEC60335-1, paragraph 7.8, which is reproduced
below:
7.8 Except for TYPE Z ATTACHMENT, terminals used for connection to the
supply mains shall be indicated as follows:
terminals intended exclusively for the neutral conductor shall be indicated
by the
The comments reminded me of a story I heard about some years ago.
A pcb design included a metal canned crystal oscillator, the unit being
mounted in a metal enclosure. During ESD testing, the system functioned
correctly until before the end of the requisite zaps, the oscillator
failed. After
I do not think that IP phone is under the RTTE directive. For a simple
reason, voltage is limited to 48 V (SELV) and the phone itself is a SELV
unit with a microphone, a speaker and a fancy LCD.
Clearly if we try hard we may squeeze an IP phone under the RTTE
directive, but the proper compliance
I read in !emc-pstc that neve...@attbi.com wrote (in 200212040412.gB44C
ps05...@orion2.ieee.org) about '48V supply on VoIP' on Wed, 4 Dec 2002:
Is there any safety or reliability concern with 48V possibly permanently
across
0.02 spaced pads on a PCB surface? I believe safety-wise it is okay,
I read in !emc-pstc that Fallah, Ahmad afal...@ciena.com wrote (in
2135200c183fd5119588009027de5723018d7...@wntcsdexg02.csd.ciena.com)
about 'Painting the ferrite tiles on a Semi-anechoic chamber' on Tue, 3
Dec 2002:
The idea is to paint the ferrite tiles in a light color to brighten
up the
Ahmad,
I would tend to shy away from painting the inside of your chamber. Depending
what type of material is in the paint, the performance of the chamber could
be affected. Materials that one would think wouldnt have any affect on
measurements often do. Our facility uses white styrofoam covers
On powered Ethernet interfaces, 48 VDC is delivered from Ethernet switches to
IP phones with + over one twisted pair and - over another pair of a CAT5 cable.
The power is not permanently connected to the connector or cable. It is
switched to the socket/plug only if an IP phone is detected on
Greetings to all interested parties:
The November presentation of the RMCEMC:
Signal Integrity Design versus Radiated Emission Control by Dr Cheung-Wei
Lam is available for
download at our website http://www.ieee.org/rmcemc
Best Regards
Charles Grasso
RMCEMC Vice-Chair
Thank you to all those who replied re this question.
Best regards,
Kevin Richardson
Stanimore Pty Limited
Compliance Advice Solutions for Technology
(Legislation/Regulations/Standards/Australian Agent Services)
Ph: 02-4329-4070 (Int'l: +61-2-4329-4070)
Fax: 02-4328-5639
Alex,
Amendment 2:2001 to EN 61000-4-2:1995 (same as Amendment A2:2000 to IEC
61000-4-2:1995) calls for discharging ungrounded equipment, or
ungrounded part(s) of equipment between ESD zaps. You use a bleeder
cable with 470k resistors at both ends, connected to the horizontal
coupling plane for
Group,
Has anyone attempted to paint the inside of an anechoic chamber (i.e., paint
the ferrite tiles)? Some chambers have partial or no coverage of the
ferrite tiles by the absorber cones, which result in darkening the chamber's
inside. The idea is to paint the ferrite tiles in a light color
Amendment 2 to IEC 61000-4-2:1995 specifically addresses the test method
for ungrounded equipment. Refer to section 7.1.3 of that standard. To
answer your first question, yes the charge applied to the product should be
discharged before applying the next discharge. Regarding your follow up
I read in !emc-pstc that Kevin Richardson kevin.richard...@ieee.org
wrote (in nebbihdflagbliikmlbkgeabdnaa.kevin.richard...@ieee.org)
about 'Surge Protection EN 60439-1' on Tue, 3 Dec 2002:
Can anyone please advise if EN 60439-1 allows the practice of placing a
surge protection device (eg an
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