Here's how it works:
The combination of the four resistors determines the total surge current. If
the voltage is 4kV and each resistor is 160 ohms (1.2/50us generator), the
total source impedance becomes 42 ohms (2 ohms internal to the generator in
series with the 4, 160 ohm parallel resistors),
Check EN 61000-4-3
-Original Message-
From: wo...@sensormatic.com [mailto:wo...@sensormatic.com]
Sent: Tuesday, September 05, 2000 11:21 AM
To: emc-p...@majordomo.ieee.org
Subject: ENV 50204
The Generic Immunity standard, EN 50082-1 references ENV 50204 for a
radiated immunity test. The
Group,
When earthing a line as in Figure 12, shouldn't the resistor to that line be
removed? Otherwise the surge will simply pass through that resistor to ground.
Opinions?
Regards,
David.
David Gelfand
Regulatory Approvals Group Leader
Memotec Communications Inc.
Montreal Canada
I do not disagree with the positions posted on this subject. My question is
how does the EU interpret and enforce this requirement/definition.
Pryor
- Original Message -
From:
To: ;
Sent: Tuesday, September 05, 2000 2:07 PM
Subject: RE: Conducted Emissions on Telecom Ports
>
>
> -Original Message-
> From: Peter Merguerian [mailto:pmerguer...@itl.co.il]
> Sent: Monday, September 04, 2000 8:43 AM
> To: emc-p...@majordomo.ieee.org
> Cc: ico...@itl.co.il
> Subject: ADSL system. FCC requirements
>
>
>
>
> Dear Group,
>
> We have ADSL system comprising subscrib
This interpretation came from the FCC and a Notified Body - in the course of
numerous
discussions on this subject, may I say.
Regards,
Bandele
Jetstream Communications, Inc.
badep...@jetstream.com
-Original Message-
From: Peter Tarver [mailto:ptar...@nortelnetworks.com]
Sent: Friday,
If LAN's cause interference, the mechanism would be radiated, not
conducted. Testing may be moot on LAN's whose fundimental frequency
lies between 150kHz and 100MHz; STP is the only way to 'pass'.
Of course STP has safety implications due to earthing potentials.
The Generic Immunity standard, EN 50082-1 references ENV 50204 for a
radiated immunity test. The foreword of the ENV says it will be withdrawn
once an IEC/CENELEC standard has been published. Has this interim standard
been withdrawn and replaced by an EN 61000-4 series standard? If so, which
one?
LAN ports
Testing Conducted RF Emissions on LAN twisted-pair lines is almost
contrary to the intent of EN 55022 as Gary pointed out. Conducted
emissions is more appropriate for asynchronous analog lines.
LAN transmissions are digital and synchronous (except maybe
Gary
If you read the definition of telecomm ports in CISPR 22 (sect. 3.6) it
includes Local Area Networks, and other similar networks. Some people have
even tried to extend this to RS 232 because of past abuses of this interface
(like stretching the cable length to several hundred feet).
There is
Seems more likely I was. Actually, I have run these tests anyway for
other reasons I just git riled up by a single segment of the community that
imposes restrictions on the rest of the world.
Okay, I just get riled up about a lot of stuff.
Gary
-Original Message-
F
Folks,
Just to add to the mix of questions so far, here's a few more that Debbie
may wish to consider:
1) is the demarkation point for the product clearly identified?
2) Is a smart jack always to be used with the product? Who supplies it
(i.e. mfg. or customer)?
3) Is the product in questio
Reference CISPR 22:1997, Clause 3.5
"telecommunication ports
Ports which are intended to be connected to telecommunication networks (e.g.
public switched telecommunication networks, integrated services digital
networks), local area networks (e.g. Ethernet, Token Ring) and similar
networks."
This
In response to my note that I disagree with LAN's and Ethernet ports
being telecommunications ports I received this response from a friend and
associate. Because he did not send it to all of us I have just cut his
comments out in order to protect his privacy, but I thought the note
importa
I believe the basis for many (most) component failures comes from
the military and the Reliability Assesment Center (RAC) - and I could have
the name slightly wrong. They ran demonstrated tests on components at
various stress levels to derive the FITS, for the Military.
I believe
Define telecom port.
A LAN port isn't neccessarily a LAN port. Ethernet ports do not
connect directly to the Telecommunications network - a necessary condition
before being a telecommunications port. LANS and MANS operate all of the
time without any use of any telecommunications e
Conformity-Update for the week ending Sept. 1, 2000 is now available
at:
http://www.conformity-update.com
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Koh,
Review the requirements for fault testing in either UL 6500, 2nd ed or
EN60065 6th ed (cls. 4.3.10). They state that "each group of ventilation
openings that are likely to be covered simultaneously, shall be covered in
turn and tested seperately".
" Ventilating openings that are likely to be
Hello all,
For one of my customer, I'm looking for an inverter 115/230Vac to -48VDC
which is UL, cUL certified and CE compliant.
If you know some providers, thanks for your inputs.
Best regards,
Pierre.
Pierre SELVA
2 route de la GROBELLE
73000 JACOB BELLECO
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
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