Some of you may have received the message below and you were no doubt at a loss
as to why your KES account was terminated. Or more importantly, why you even
had a MindCruiser KES account. So I thought I would fill in some details for
you.
As Oscar mentioned in a recently e-mail, we have been
200106291102_mc3-d7ac-3...@compuserve.com, Cortland Richmond
72146@compuserve.com inimitably wrote:
the FCC H
pattern is designed to generate a periodic
signal as the electron beam is swept across
the screen and turned on and off.
Indeed, but it is an unrealistically severe operating
00a001c100a4$f710e280$38581...@memotec.com, David Gelfand
gelf...@memotec.com inimitably wrote:
What other countries besides CE have immunity requirements similar to EN 55024
or EN 50082?
Consider that you can gain a marketing advantage by stressing the
immunity characteristics of your product,
Fellow listers;
If you are aware of a laboratory(ies) in the SF Bay Area that can perform safety
testing on transformers, please email me off-list with contact info.
An urgent situation warrants a quick turn-around.
Thanks in advance
=
Best Regards
Hans Mellberg
Regulatory Compliance EMC
Hi David,
You asked/stated:
Caps to ground can not be greater than .022 uF for FCC impedance
to ground during ringing limit of 100k ohms, it will still pass FCC leakage
current test at 6.8 mV @ 1000V. Have I missed anything about impact of
caps to ground for European requirements?
Don't
FYI - In the state of Minnesota they refer to this document as Article of
Incorporation and not Certificate of Incorporation. I confirmed by
checking ours.
-Original Message-
From: Clement Dave-LDC009 [mailto:dave.clem...@motorola.com]
Sent: Thursday, June 28, 2001 3:59 PM
To: 'Veit,
Some monitors from the 1990's WILL meet class B with small H's. I know;
I've done it! At a former job (gad, we use that a lot!) we were able to
get monitors scrolling H's in high resolution to pass Class B. Sometimes it
took modifications, which the manufacturer would copy, but it could be
done.
=There really ARE Class B computers, but you
have to work to make them, and you have to look
to FIND them. I've worked on some of them.
Between CRT's and LCD's, the generators are
different, but the levels are not necessarily
lower for an LCD.
A CRT has a fairly powerful, high frequency
Hello,
I finally passed rf conducted immunity on my telephone cards! As it turned out,
not only the telephone card using the Legerity 79R70 was demodulating but also,
the card
towards the network using a Mitel/Zarlink MH88437AD-P.
To each card I added a common mode choke (TDK ZJYS51R5-2PB),
In a message dated 6/29/01, David Gelfand writes:
What other countries besides CE have immunity requirements similar to EN
55024
or EN 50082?
Korea is one example. I think Singapore is phasing in some immunity
requirements.
Joe Randolph
Telecom Design Consultant
Randolph Telecom, Inc.
Passive LCD monitors can be quiet. However, most new monitors I have seen
use active matrix Thin Film Transistor (TFT) technologoy which provides a
better picture but are considerably worse for emissions. If you compare the
two technologies you will see the reason. This has been consistent
Joe and Group,
Thanks for your answers. But I think I should refine some points where I
still have some doubts.
I'll try to put my doubts in topic mode, for a matter of clarity:
- The case is this: I have a Telephone Set (wired to the Public
Telephony Network). And I'd like to sell it to
What other countries besides CE have immunity requirements similar to EN 55024
or EN 50082?
Thank you,
David.
David Gelfand
Regulatory Approvals
Memotec Communications Inc.
---
This message is from the IEEE EMC Society Product Safety
Technical
I have had similar experience. Not experimenting with LCD's themselves, but
testing products with LCD's. Most of the ones that I have experience with
have a metal back plate. It seems that it's important to bond this plate
peripherally to your casework shielding. That keeps the circuits
Greetings all,
At a former job, I actually performed many scans of LCD monitors from
many 'unnamed' manufacturers and found them to be different from
normal CRT's for emissions purposes. The LCD's would incorporate fast
(for monitors) clocks for processing. I have seen clocks anywhere from
65
You need to use a bandwidth of 1MHz above 1GHz remember.
---
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.
Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/
To cancel your
Amund,
1. Europe - Contact a Notified Body
2. US - FCC. Consult an FCC/IC recognized test lab in the US. Use the
following link to find a test lab.
https://gullfoss2.fcc.gov/prod/oet/index.html
3. Canada - Industry Canada. Use same lab as for FCC. Make sure they can
do both.
4. Japan -
George,
I did a number of experiments on 15 monitors for a machine HMI. They are
indeed quiet, but there is quite a difference between manufacturers.
Most of the problems I had to fix were related to leakage through the display
from circuitry behind it.
Derek.
George,
The LCD itself does not usually use high voltages, but most are
supplied with a fluorescent tube backlight. This is usually driven by a
high-frequency (50+ kHz) oscillator with an output designed to deliver
an open circuit voltage in the low kilovolt range to strike the
tube, followed by
3b3bf7e4.3100a...@prodigy.net, Steve Brody sbr...@prodigy.net
inimitably wrote:
For products (this one is a chiller) using a GFI or Earth Leakage
Circuit Breakers what are your recommendations for passing EN
61000-4-6?.
What is allowed concerning disconnecting the neutral sensing wire?
First of
I was thinking more about radiated emission (30 Mhz-1 GHz) that is enhanced
by cables.
For some interesting results reported by Douglas Smith (cir. 1999 ) see:
http://emcesd.com/tt120199.htm
Effectively it is half (?) a turn if a ferrite clamp-cores are used, hence
a distributed
:-)
Tim Foo,
Group:
I am posting a question for and from a colleague:.
For products (this one is a chiller) using a GFI or Earth Leakage
Circuit Breakers what are your recommendations for passing EN
61000-4-6?.
What is allowed concerning disconnecting the neutral sensing wire?
Thanks in advance.
List,
I would suggest a noise budget calculation for a EMC bandwidth of 120 kHz
before you proceed. You may need to consider mounting the pre-amp on the
test (receiving) antenna and in such case consider the possibility of ESD
damage during set up.
cheers :-)
Tim Foo,
Hello All,
I have theorized that a Liquid Crystal Display (LCD) monitors should have
less radiated emission than a comparabe CRT (same viewing area) since there
is no high voltage tube and high powered oscillators, etc. I am wondering
if anyone can confirm or deny this rumor based on actual
EDFA411E5E4AD2118D6F00A0C99E4BAC0386AF2E@FLBOCEXU02,
wo...@sensormatic.com inimitably wrote:
No, if the equipment was placed on the market prior to 2001 and was
compliant with the requirements in place at that time. Refurbished equipment
may be resold forever based upon the CE requirements at the
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