Hi Chris,
To answer your question, look to your UL Follow-Up Service Procedure (FUSP) and
find the Listing
Mark Data page. This page details the composition and elements of the UL
Listing mark, which are:
1. UL in a circle (the famous UL Listing mark symbol),
2. The word LISTED in capital
Dear Cecil,
As an Israeli I can advise you that the Israeli Standards are based on CISPR 22
and
CISPR 24 Standards for ITE.
I trust that that would be the case in many other countries, who are members of
IEC/CISPR.
Best regards,
Elya B. Joffe
-- Original Message --
John,
Really good information there regarding treatment of chassis ground
evacuation of other layers. I'd add the comment that the layout of the
signal etch between the transformer the RJ45 connector (UTP) is also
important. Keep the +/- pairs as short, tightly coupled and as symmetrical
as
Hi Chris:
Does the file number need to be on the label? Can the manufacturer
leave the file number off of the label and simply put a generic UL (or
CSA) mark on the product along with their nameplate identifying the
manufacturer, model and serial number?
In my response to
Chris,
The use of a 'generic' UL mark, in the case of ITE products,
is not possible.
As was noted in an earlier thread about the mark, a proper
UL mark consists of 4 elements (as per the Listing Mark Data
Page in your FUS procedure):
1) The UL Logo
2) The word 'Listed'
3) A 4 digit
Jon,
My department has developed ten generations of Ethernet adapters (10BASE2,
10BASE-T, 100BASE-Tx) for IBM/Lexmark printers since 1990. We have looked at,
but so far have not used, integrated-magnetics connectors because we like having
the option of putting a common-mode choke in between
This thread brings up a question that I have been wondering about.
Amund's question dealt with a product that had the UL label and a file
number. The file number was used to identify the manufacturer. My
understanding of the response that Amund received is that this
identification is adequate
Apologize for being off topic, but I've attached a printable calendar for
2002.
It prints out on 8 1/2 by 11 (for all the metric people) in landscape mode.
Very little clutter and has big squares to write in. If you have a DeskJet
500, you can print directly to it.
If not, use the text file
It is - however - wise not to read too much into this decision and assume
that obtaining a CB Report from a UL Product is matter of fact.
There are many pitfalls. E.g. - X and Y Caps may be have been reviewed to an
older (950) standard that permits compliance to EITHER UL OR IEC.
Been there
Hi David,
You cannot ignore the ground plane at all. It would be better to think
of the transmit antenna as two separate antennas at 1m above and, 1m
below, the level of the ground plane and then you can ignore it to some
extent. You will always see the combination of these two sources.
Simply
Jon, Richard,
Test radiated emissions at both speeds and with each cable type. Per
ANSI/IEEE 802.3 and 802.3h, 100BaseTX has 1/2 the pulse height of 10BaseT
(to reduce EMI).
Whether to earth the shield (or semi-shield) is an eternal question. These
four possibilities can occur (since a hub
Sorry. I clicked too fast during spell checking. I meant,
thank you.
-Original Message-
From: Peter Tarver
Think you, Angus.
---
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.
Visit
Think you, Angus. The title for this standard is:
Primary Batteries - Part 4: Safety Standard for Lithium
Batteries
In my case, and I think this is true of all Li ion cells and
batteries, it is a secondary battery, meaning rechargeable.
Primary batteries can't be or aren't intended to be
From: Cecil A. Gittens
What are the EMC requirements for ITE products that are marketed in the
Southwest region of Russia,
Eastern Mediterrian countries, Asia, South Africa, Israel, Indonesia,
Saudi Arabia, Singapore.
Cecil
---
This message is from the
All,
I have a question regarding a horizontal transmit antenna over a ground
plane. My questions implies a dipole.
The questions:
What impact does the ground plane have on a horizontally transmitted signal?
If the transmit antenna is 1 meter above the ground plane is the only
signal
Jon,
if your running high etherent freq.
and the shield is NOT grounded,
you might fail class A FCC/Cispr 22.
Richard,
-Original Message-
From: Jon Keeble [mailto:j.kee...@fairlightesp.com.au]
Sent: Wednesday, October 17, 2001 1:05 AM
To: emc-p...@majordomo.ieee.org
Subject: 10/100 base
Enclosure manufacturers normally stock filter material and accessories.
Try http://www.rittal-corp.com/
Andy.
-Original Message-
From: Chris Maxwell [SMTP:chris.maxw...@nettest.com]
Sent: 16 October 2001 15:39
To: EMC-PSTC Internet Forum
Subject:Air Filter
Just a thought, why don't you try contacting the technical department of a
vacuum cleaner manufacturer?
Regards
Chris Colgan
Compliance Engineer
TAG McLaren Audio Ltd
The Summit, Latham Road
Huntingdon, Cambs, PE29 6ZU
*Tel: +44 (0)1480 415 627
*Fax: +44 (0)1480 52159
*
I promised to send you the result regarding the UL marking/label on a open
frame power supply. The local UL-follow-up folks have now agreed that the UL
file number identifies the power supply manufacturer, even that the
distribution company has the company logo on the label. They said in this
RJ45s come in shielded, unshielded, and shielded with integral magnetics
(and probably other flavors as well).
Has anybody got any suggestions / experience / whatever re the use of one or
other of these parts in a product that will live in a plastic box, power by
an external mains adapter /
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