Hi Rich - I know what is says - but I just picked up my LAN cable and it
reads:ETL VERIFIED TO EIA/TIA TSD-40 CATEGORY 5 E111018 TYPE CM 24 AWG
(UL)LL92833 CSA TYPE FCC FT4
'nuff said...
Best regards
Gregg
-Original Message-
From: owner-emc-p...@majordomo.ieee.org
This appears to be the missing piece . . .
--
From: Ken Javor[SMTP:ken.ja...@emccompliance.com]
Sent: Thursday, October 18, 2001 4:39 PM
To: umbdenst...@sensormatic.com; emc-p...@majordomo.ieee.org;
stu...@timcoengr.com
Subject: FW: duty cycle correction
Perhaps I oversimplified.
The definitions may be conditioned by what the FCC is looking for. And in
general, I have always tested my understandings for a sanity check, not as a
proof.
So, going back to the origins of the question, in some sections the FCC
refers to an averaging detector, and
There is another issue which is different which may be what the FCC is after
(I didn't read the referenced part 15 paragraph). FCC calls it pulse
desensitization. It was what the mil and aerospace world used to call a
broadband signal. If a signal is in the passband of a receiver for less
time
Stuart, I think you were asking about bulk-quantity discounts. I have
bought single-copies from the IEC website (needs a credit card):
www.iec.ch. You might find some info on the same site, apologies if you
tried already. If you only want IEC _EMC_ standards, I think they have a
package of
I wasn't going to weigh in on this but... what was presented by Mr.
Umbdenstock is equivalent to saying that since 2 + 2 = 4, then 2 x 2 = 4.
It is tautological. The decibel scale is a power ratio. If a signal has a
particular duty cycle then it is the total power that is affected by the
duty
When i worked for my last company we also used Universal and found them to
be very knowledgable and responsive.
They were able to supply us with a UL 94 HF-1 flame class filter that was
also met the Telcordia requirements for flammability - which I cannot
remember now off the top of my head.
When i worked for my last company we also used Universal and found them to
be very knowledgable and responsive.
They were able to supply us with a UL 94 HF-1 flame class filter that was
also met the Telcordia requirements for flammability - which I cannot
remember now off the top of my head.
The difference in duty cycle factors seems to be based on taking the power
based on the average voltage (rms power) versus converting voltage to power
and then taking the average. Thus, the average power is half of the rms
power.
It is as simple as that, just do the math.
The question is, which
Agreed, and if it weren't for the unscrupulous we wouldn't need
follow-up inspections, or laser embossed UL logos etc. A certain large
country had so many bogus UL marks on power supplies that they have recently
instituted a holographic mark on some recognized supplies. (That didn't work
I understand the responses to my first question. But what if we took the
original time domain display (voltages) and converted it to power vs time?
Now if you take the average power reading based on the conversion, you get
10log() and not 20log(). Something just doesn't seem right.
Does anyone know where the best deals are for purchasing the IEC standards?
I think there is one deal for IEC members that gives them all of the
standards via download. The membership fee is
---
This message is from the IEEE EMC Society Product Safety
Guys,
I think that we've found the rub. UL is different than CSA in this
regard (marking). UL can certify products for dual listing in US and
Canada. CSA can also certify for dual listing in US and Canada.
However, there is a difference in the marking requirements. We have
used CSA
Stuart,
Duty cycle in 15.231 is related to a voltage ratio, therefore 20 log(duty
cycle) will provide the correct factor.
Demonstrate it to yourself. Start with a given value (say 100V), multiply
this by some duty cycle (say 15% or .15). Convert the result to dB. This
is your reference
Hi Peter:
Thanks for sending the UL letter and UL Listing Mark page.
I stand corrected.
For Information Technology Equipment, UL's letter of March 31,
1995, authorizes the optional use of the file number as the
control number.
Apparently, this option is not available for non-ITE products.
20log(d)
time is linear, like voltage
not the square, like power, thus the 20log
- Robert -
Robert A. Macy, PEm...@california.com
408 286 3985 fx 408 297 9121
AJM International Electronics Consultants
619 North First St, San
Greetings All,
I work for a product safety consulting firm/test lab/agent. I am currently
having some difficulties with UL relating to one of our customer's products.
The grounding scheme of the products has become a barrier which has halted
the planned testing. In our opinion, the engineering
At the IEC website but only at a price. I'm afraid IEC standards don't come
for free.
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
* Mailto:chris.col...@tagmclaren.com
*
Part 15.231 devices use a duty cycle correction factor to adjust peak
readings. The duty cycle represents the fractional on-time over a given
period of time (that must be under some limit). Anyways, given this
fractional time, d, how do you make the conversion to dB?
10log(d) or 20log(d)?
Gary,
About 50% of our 100BASE-Tx cards require an additional 4-line common-mode choke
between the transformer-filter and the RJ-45 connector, to meet Radiated
Emissions limits with enough margin to satisfy our electromagnetic compatibility
(EMC) folks. So we snuggle all three components as
An ESD question or two...
For SAE J1113-13 and ISO 10605: Are air discharges directed to non-metal
surfaces only as in IEC 61000-4-2?
Or are both air and contact discharges directed to metal contact locations?
(This may sound like a silly question, but the SAE/ISO specifications are
not clear on
Hi Rich,
1. UL in a circle (the famous UL Listing mark symbol),
2. The word LISTED in capital letters,
3. The assigned control number*, and
4. Product identity (e.g., NWGQ, I.T.E., etc.)
* The assigned control number is a designation that UL assigns to a
manufacturer, or
Ok, ok.
For all those whose virus scanners spit up when seeing files with my
mnemonic names - upon request I'll send to you an unzipped version (about
60K total) with every file renamed with the extension *.txt. For example,
PRINT_02.BAT will be PRINT_02.BAT.TXT etc Then you can do with it
Rich -
Regarding UL Recognized Component Appliance Wiring Material,
the yellow book states that the marking must be on a tag,
the reel or smallest unit container, not surface marked on
the wire insulation, as referred to by Greg. Very few UL
FUS folks will accept surface marking, though I had
Gary -
Or for the less scrupulous than careless, to remove the
certification mark from a product and place it one that is
not safety certified.
Regards,
Peter L. Tarver, PE
Product Safety Manager
Sanmina Homologation Services
peter.tar...@sanmina.com
From: Gary McInturff
The Product
Peter -
If you have such a memo, please do provide a copy. I my
years working at UL and working with them since, it was ever
abundantly and adamantly maintained (by UL's FUS Label
Services group) that the Control Number is a required part
of the Listing Mark and there is no substitution for it.
Rich is quite right, in general. There are UL Listing Marks
available, but they won't have the other three required
elements that make up the complete marking (some may include
the word Listed).
The page Rich referred to in a UL Follow-Up Services
Procedure, though, is separate from the Section
http://www.iec.ch/webstore/
Respectfully yours,
Constantin
Constantin Bolintineanu P.Eng.
DIGITAL SECURITY CONTROLS LTD.
3301 LANGSTAFF Road, L4K 4L2
CONCORD, ONTARIO, CANADA
e-mail: bolin...@dscltd.com
telephone: 905 760 3000 ext 2568
Visit our web site at www.dscgrp.com
-Original
Can be obtained from http://www.iec.ch/seatop-e.htm if you pay for it. Don't
know if it is downloadable - updates are in pdf format. Also try
http://www.bsi-global.com/group.html but again you'll have to pay.
Chris
-Original Message-
From: lisa_cef...@mksinst.com
Rich and others,
Here is what the Listing Mark Data Page says in one of our FUS books for a
piece of Listed ITE equipment that was Listed to UL 1950. Note number 3
below stating that you can use the File Number or the Control Number. By the
way we create our own Listing Mark labels using the
Hi all,
Does anyone know where I can download a copy of IEC 61508?
Thanks,
Regards,
Lisa
Lisa A. Cefalo, CRE
Manager, Reliability and Design Services
MKS Instruments
(978)-975-2350 X 5669
lisa_cef...@mksinst.com
---
This message is from the IEEE
This message is addressed to members affected by national regulations for
EMF exposure of workers and the general public, especially in Europe. I am
attempting to learn at an early stage when national regulations are being
developed or revised, but I am having great difficulty in finding persons,
- Original Message -
From: Alan E Hutley
To: emc-pstc
Sent: Thursday, October 18, 2001 10:15 AM
Subject: SLIM Survey Findings
Hello All
The findings of the European Commission survey for proposals to modify the EMC
directive can now be found in a 15 page word document on the home
Hi all,
Can anyone tell me what if any EMC/Safety Certification is required for
Military Equipment supplied to Japan. It should be noted that in one
application the equipment can be connected to the electrical utility.
Regards
Andrew Price
BAE SYSTEMS Avionics
email
Hello All
The findings of the European Commission survey for proposals to modify the EMC
directive can now be found in a 15 page word document on the home page of our
web site www.compliance-club.com it makes for interesting reading.
Cheers
Alan E Hutley
EMC Compliance Journal
Rich,
For ITE, the file number may be used in lieu of control number. I will be
glad to provide a memo from UL Labels Department regarding this issue.
This e-mail message may contain privileged or confidential information. If
you are not the intended recipient, you may not disclose, use,
Cecil,
For Singapore the following are some excerpts from the requirements as
given in TAS (Telecommunication Authority of Singapore) specification - TAS
TS EMC, issue 1, May 1999:
EMISSION STANDARDS (Mandatory)
CISPR 22 Limits and Methods of Measurement of Radio Disturbance
Hi Robert:
I got two NAV (Norton Antivirus) msgs back from the ieee.org that said my
attachment had a virus in it.
If so, please let me know, because there is nothing but text files (that I
know of) and a simple batch program in that attachment.
The IEEE listserver checks
Hi Gregg:
The File number 'may' be used on things like cable (it is common to see UL
and CSA file numbers) and other components - Control numbers (I forget the
correct terminology) is required on some UR components but not all Listed
products.
UL Listed wire:
According to
I'm curious what others in the compliance community have experienced over
the last year or so in regards to re-designed power MOSFET's that the big
FET manufacturers are pushing on us. These next generation trench style
FET's have smaller dies, resulting in lower on-resistance but higher thermal
Just happen to be looking this up when you e-mail arrived. I noticed
something interesting buried in the Listing Mark data page. Paragraph 5 in
our UL report. I think they are generic pages so likely you would find it in
the same place in your reports/procedures.
The Product
Question:
The Ethernet magnetics from Pulse and others are a combination of
common mode choke along and isolation windings input-to-output. The
isolation is the reason the moat is effective. Are you saying that you put
additional common mode chokes in the signal line? I am assuming that
The File number 'may' be used on things like cable (it is common to see UL
and CSA file numbers) and other components - Control numbers (I forget the
correct terminology) is required on some UR components but not all Listed
products.
Please confirm someone.
Gregg
-Original Message-
Hi Ron:
1. UL in a circle (the famous UL Listing mark symbol),
2. The word LISTED in capital letters,
3. The assigned control number*, and
4. Product identity (e.g., NWGQ, I.T.E., etc.)
* The assigned control number is a designation that UL assigns to a
manufacturer, or
I got two NAV (Norton Antivirus) msgs back from the ieee.org that said my
attachment had a virus in it.
If so, please let me know, because there is nothing but text files (that I
know of) and a simple batch program in that attachment.
Very important that *IF* I have a virus, need to know !!!
45 matches
Mail list logo
