I'm not an authority, but I would think that this is against both the
fire code and common sense. If an emergency developed such as electric
shock or fire and the breaker could not be manually opened, i see it as
tantamount to the locking of fire escape doors and many liability
concerns.
Many line filters do indeed have a bleeder resistor built in. There
are a few which do not, and I am familiar with one Delta filter that
does not. We added the bleeder across the terminals of the filter and
it was approved by UL. It just has to be done in accordance with
accepted
John,
Cable emissions seldom are a significant factor above 1 GHz. Besides, we're
supposed to tune for maximum smoke, not minimum grin.
There are products on the market today that meet the FCC limits, but would
not meet the tighter limits being proposed. There are no interference
complaints
Levels are 1, 3, and 10 V/m, but that is unmodulated. The required
modulation scheme (80% AM) adds a requirement for an extra 5 dB of headroom,
so that if the EUT responds to the peak of the modulation waveform (as most
electronic circuits do) the field intensities are effectively 1.8, 5.4, and
Please ignore my auto message. I am still refining it to prevent the
continual spam my employer can't seem to filter out.
Sincerely,
Mat Aschenberg
-Original Message-
From: John Woodgate [SMTP:j...@jmwa.demon.co.uk]
Sent: Wednesday, September 18, 2002 2:59 PM
To:
In the computer simulation business we are moving towards various PC solutions
at the request of our customers. These PCs are used in environments that have
been defined as Heavy Industrial by our customers and the test organizations
that validate the systems in the field.
This forces us to
I read in !emc-pstc that plaw...@west.net wrote (in aihhoukcs7do5gccv15
r46rjd0l8p0j...@4ax.com) about 'Medical equipment and EN61000-3-2' on
Wed, 18 Sep 2002:
Or are their different levels of hospitals, some fed by LV transformers, some
fed by MV transformers?
Yes.
--
Regards, John Woodgate,
I read in !emc-pstc that Ken Javor ken.ja...@emccompliance.com wrote
(in 0h2n005m8hj...@mtaout04.icomcast.net) about 'Current from Car 12V
cigarette lighter socket' on Wed, 18 Sep 2002:
An excellent post. Seems like a solution here would be for the newer
electrical outlet to be designed
I read in !emc-pstc that alan.hud...@amsjv.com wrote (in 78431417180920
02/A03945/MULDER/1209944E2A00*@MHS) about 'Immunity severity levels' on
Wed, 18 Sep 2002:
With regard to radiated emission immunity and EN61000-4-3 (or IEC 801-3)
I believe there are different field strengths used, depending
Brian -
USB on a PC is designed for residential environment; stress levels should
be 3V/m for EN61000-4-3 and 3V for EN61000-4-6.
We got similar results checking USB to EN50130-4 alarm system requirements
(which resemble industrial environment. EFT needs fault-tolerant software
(acceptable
I read in !emc-pstc that Pettit, Ghery ghery.pet...@intel.com wrote
(in d9223eb959a5d511a98f00508b68c20c12515...@orsmsx108.jf.intel.com)
about 'Clock frequencies' on Wed, 18 Sep 2002:
CISPR SC I meets next week in Christchurch, New Zealand and this will be a
topic of discussion at the meetings.
Hello all
Sad to say I was made redundant yesterday so if any of you know of any
positions available for a senior EMC engineer / manager with a load of
experience in the commercial laboratory field please let me know at this email
address.
Positions in the US, Canada or the UK preferred.
I read in !emc-pstc that Tyra, John john_t...@bose.com wrote (in
418fbd441c22d5118d860003470d43160543e...@cupid.bose.com) about
'EN60065 mains switches' on Wed, 18 Sep 2002:
Also be aware that the published 7th edition of IEC60065 eliminates the need
for a switch which is in line with the
I read in !emc-pstc that Colgan, Chris chris.col...@tagmclaren.com
wrote (in AE0F4BD08FEAD211895900805FE67B1F01425A89@CAT) about 'EN60065
mains switches' on Wed, 18 Sep 2002:
I know that engineers familiar with EN60065 are rarer than hen's teeth but
maybe someone out there can help me...
Clause
Hello Patrick,
In most of the developed world hospitals have their own (non-public)
low-voltage distribution system.
They have their own distribution transformer(s) and parts of the system may be
floating (e.g. European operating theatres) while other parts have emergency
back-up systems
Thanks.
The solution you propose is in the works. The SAE is working on a
completely different style connector for power connections to 12Vdc, and 2
other styles for 42Vdc and 120Vac connectors. This effort is just getting
off the ground however.
Jim Eichner, P.Eng.
Manager, Engineering
I read in !emc-pstc that soundsu...@aol.com wrote (in 14f.143ddef3.2ab9
c...@aol.com) about 'CE Marking for Passive speakers' on Wed, 18 Sep
2002:
In a message dated 9/18/02 4:40:07 AM Eastern Daylight Time,
j...@jmwa.demon.co.uk writes:
Have you looked at a properly-labelled
I read in !emc-pstc that Gert Gremmen g.grem...@cetest.nl wrote (in
mpeeiccjhhndekobpnnbeeekcgaa.g.grem...@cetest.nl) about 'CE Marking
for Passive speakers' on Wed, 18 Sep 2002:
Although your reasoning sounds valid, it's simply
not accurate. Firts; The guidelines are not LAW
Guidelines are
An excellent post. Seems like a solution here would be for the newer
electrical outlet to be designed differently and not mate with the older
male cigarette lighter insert, and then provide an adapter that would take
the cigarette lighter insert to the new electrical outlet. Then the 8 Amp
Hi John,
Though you are fully right theoretically, i think parts of your story are a
bit overdone.
Most people do not make a habit-of-disconnecting-their-heavy-equipment-while
carrying-it-over-their-feet-at-the-mains-voltage-phase-point-of-90-degrees-w
hile-actively-seeking- both
Brian,
The products were likely tested to the requirements in EN 55024. 3 V/m
radiated immunity. 3 V conducted immunity. 500 V EFT. That is the product
specific immunity standard for ITE, and USB is an ITE interface. Thus, the
CE Marking was correctly placed on the product. We seldom see
The scope of EN61000-3-2:2001 says that the standard deals with harmonic
currents injected into the public low-voltage distribution system.
I can see that residences and offices are connected to the public system.
However, I don't know about distribution to hospitals.
Are their power
Dear Group,
Our Engineering Department thinks that USB is the worlds best interface. Though
it has a lot going for it, I'm not sure if is all that, but never the less, I'm
seeing it used to control and interface with commercial and industrial
instrumentation requiring the more severe immunity
UL2089 covers appliance using the socket. There is no UL or CSA standard
covering the socket itself, but there is SAE J563, which provided dimensions
and limits the continuous current drawn through lighter sockets by
appliances to 8Adc.
The intent is to protect the wiring in behind the
Hi! I have a fast ethernet design that does not pass
EMI from 30 to 100mhz and based on the scan it is
common mode noise. In my design i have the phy
connected to xfmr1--choke1---connector---I/O
card---xfmr2choke2---rj21---cables---patch
panel---rj45.
Now, if I use shielded cables from RJ21
Hi Neil,
Thanks for your response. Let me see if I can clarify. The product we are
talking about is Class 1 device. We have offices and service centers in the UK,
Germany and France. In addition to this we use a network of distributors. These
distributors for this device in question are
Hi All,
From personal experience I can tell you that the involuntary reaction to a
shock can have serious consequences to
the sales of a company. In a former life - a previous employer OEM'd a PC
from a Korean Company. The PC had all
the relevant marks but somehow the resistor that was
Dan,
I just got DSL service from Verizon in Mass and the second senerio is what I
got. They sent me a self install kit which didn't require anyone from Verizon
to come to the house for the installation. I just waited until I got a message
from them that my line was tied into the DSLAM at the
Group,
Is anyone aware of an authoritative position on the acceptability (or not)
of applying a lock to a breaker panel cover (and so affecting access to
other, unrelated, breakers behind the same cove) to achieve OSHA compliant
Lockout/Tagout rather than applying the lock to breaker directly?
With regard to radiated emission immunity and EN61000-4-3 (or IEC 801-3)
I believe there are different field strengths used, depending on the
environment in which the apparatus being tested is to be used.
I believe equipment to be used in a well-protected environment may be
tested at a lower
Mark,
I assume that you mean Class 1 according to the EU's Medical Devices
Directive, and not the FDA classification. Although the principle is
the same, i.e. Class 1 is low-risk, the classification method is not
identical.
The MDD deals with the device rather than the distributor.
Hello Chris,
We are going through the same issue here at Bose...A while back we received
a ruling that this type of design did meet the intent of the standard from
TUV and UL. CSA was a little more stringent in their interpretation.
Based on my correspondence with CSA here is my take:
1. You
Thanks for that update. I forgot to mention that the agency said that EN
27779 (ISO 7779) is the appropriate measurement standard.
Richard Woods
Sensormatic Electronics
Tyco International
-Original Message-
From: Luttrell, Lyle [mailto:lluttr...@peakstor.com]
Sent: Wednesday, September
There is a voluntary standard that has been developed in Sweden by
Statskontoret. The standard is based on the measurement methods of ISO7779.
The latest version of this standard was issued early this year - link is
http://www.statskontoret.se/projekt/standardisering/TN26.pdf
Lyle Luttrell, PE
Neil,
Section 15.33 of FCC Part 15 Frequency Range of Radiated Measurements
provides you with this information.
Regards
Joe Martin
Applied Biosystems
I remember working on such a filter a few years ago and from what I remember
there were no isolation type components - it was more of a high pass/low
pass filter rather than an isolation type device. This is just my memory
though, so I could be wrong.
If you think about it though, there is
I would have to agree with you Greg. When it isn't clear, step back, ask
what would be considered due diligence if marking ever came into question.
Look to what your industry is doing as a whole. If a there is a precedence
for marking, it might be a good idea to find out why and follow suit.
Neil,
Work is progressing in CISPR SC I to generate limits above 1 GHz for CISPR
22. This would be a requirement in more than just the EU. There is much
disagreement as to what the limits should be. The latest proposal that was
out for comments used the FCC limits up to 18 GHz, but with a
Greetings:
I am looking for a good design practice regarding USB transmission lines. I
commonly have problems with 120.00MHz and 252.00MHz.
Thanks in advance.
Daniel J. Pierce
Sr. Design Engineer
OpenGlobe, Inc.
(An Escient Technologies Affiliate)
6325 Digital Way
Indianapolis, IN 46278
On Wed, 18 Sep 2002 13:11:23 +0100,
Barker, Neil neil.bar...@e2vtechnologies.com wrote:
The answer to this one is simply that for capacitances up to 0.1 uF, and for
voltages up to the maximum mains supply voltage covered by the standard, the
stored energy is sufficiently low as to be
Hi all,
I operate a spectrum analyzer model HP 853A with a 8558B RF unit, which
has a strange problem around the first LO, a YIG oscillator. As some of
you will use these also, I think it is OK to ask this question.
When switching on the unit, the noise floor on the screen is 20 dB above
the
Section 15.33
(b) For unintentional radiators:
(1) Except as otherwise indicated in paragraphs (b)(2) or (b)(3), for an
unintentional
radiator, including a digital device, the spectrum shall be investigated from
the lowest radio frequency
signal generated or used in the device, without going
The ADSL modem connects directly to the phone line. The filters go on the rest
of your phones in the house to block any interference in the voice band. The
ones I have seen would be considered TNV-3 on both sides. But they would at
least need to be TNV-2 on the phone side because you would
Rob Hi!
I assume that the ADSL modem is connected to the phone line through an
external splitter. If you find an approved splitter having the required
TNV-3 to TNV-1 insulation, and you specify the specific splitter in your
manual, I gather that your interface can be TNV-1. If no such splitter
Dear All,
For an equipment where the E1 has been assessed for SELV under EN 60 950 (ie
for intrabuilding use and not subject to overvoltages), does the equipment
fall under the RTTE Directive or can the manufacturer declare compliance to
the LVD and EMC Directives.
If under the RTTE Directive,
All,
When Verizon installed my ADSL service a couple years back they put in what
they called a whole house filter, but it is actually a splitter/filter. I
don't recall any Listing marks of any kind on the device. It was installed
on the network side of the gray box on the side of my house, not
Let's think about this for a moment. The output power from a limited power
source is limited such that there is insufficient energy to start a fire.
However, the purpose of a a cigarette lighter is to start a fire. No, it is
not a limited power source. Can you make it one? Yes, by placing the
So to recap, so far we've got:
a. Yes, they're clearly covered under both the EMC and LVD Directives.
b. No, they're not necessarily covered under either Directive.
c. There's no testing required to CE Mark passive speakers.
d. Passive speakers could be affected by radiated emmissions and
In a message dated 9/18/02 4:40:07 AM Eastern Daylight Time,
j...@jmwa.demon.co.uk writes:
Have you looked at a properly-labelled loudspeaker? Or the spec for a
pair of headphones? Electrical ratings in there!
I own four sets of passive loudspeakers, a passive subwoofer and two pairs of
According to a well known German safety agency, there are no normative EU or
German national acoustic limits for ITE. The 3rd GS Ordinance on product
safety includes the requirements of the LVD and Machinery Directive, but the
requirement for acoustic noise is understood to apply only to
At 10:53 AM 9/18/02 +, Neil Helsby wrote:
I read somewhere, and now cannot
find, a reference to FCC requirements
with respect to the relationship between clock frequency and highest
emissions scan frequency.
Can anyone help, preferably pointing to the FCC document?
I also seem to
Perhaps he needs a sign based upon one found in a MIT lab:
Do not stare into beam with remaining eye
Richard Woods
Sensormatic Electronics
Tyco International
-Original Message-
From: Gonzalez, Kenneth P (Rocky) [mailto:kpgon...@ingr.com]
Sent: Tuesday, September 17, 2002 3:20 PM
To:
Hello Group,
Are there any requirements for European Distributors of Medical Devices, i.e.
license or registration. The Device in question is a Class 1 device.
Thank you.
Mark Schmidt
Regulatory Compliance
X-Rite Incorporated
Grandville, MI
USA
(616) 257 2469
mschm...@xrite.com
Charles,
I assume your equipment is ITE for use in vehicles. Since power at the
socket can be non-limiting, best is to design your equipment to have the
required fire enclosure. Your other option is to provide an approved fused
cigarette lighter cord set with built in fuse which would meet the
Hi Peter,
I'm not sure what your wrist device does. Does it have electronics
in it with clock frequencies over 9 kHz? Does it transmit a EMF?
If the device is within CISPR limits then you should be OK for
pacemakers. I think they are tested at 100 V/m. Some pacemakers
have a magnetic switch
On Fri, 6 Sep 2002 16:19:52 +0900,
Michael Jang mich...@certitek.com wrote:
I have a question for Discharge of capacitors in the primary circuit'
(Related to 60950 standard)
Standard
Equipment is considered to comply if any capacitor
I read somewhere, and now cannot find, a reference to FCC requirements
with respect to the relationship between clock frequency and highest
emissions scan frequency.
Can anyone help, preferably pointing to the FCC document?
I also seem to remember similar comments being considered by the EU.
Yes Charles it's UL 2089 Vehicle Battery Adapters. I also have a unit (ITE
Listed) that will operate from a auto battery and I have to make sure that all
my 12V devices meets this standard.
Ron Baugh
VeriFone, Inc.
-Original Message-
From: Charles Blackham
Hi John
Although your reasoning sounds valid, it's simply
not accurate. Firts; The guidelines are not LAW
Guidelines are publicly available, but they are not binding in the sense of
legal acts adopted by the Community. The legally binding provisions are
those transposing the EMC Directive
The
Some of our equipment runs off 12Vdc. Typically this is provided by a UL
Listed ac/dc power supply that meets the Limited Power Source requirement of
IEC60950. We wish to be able to power this from the 12V cigarette lighter
socket in a car:
Is there a standard that covers the output of 12V
Hello
I know that engineers familiar with EN60065 are rarer than hen's teeth but
maybe someone out there can help me...
Clause 14.6.2 allows for no mains switch to be fitted if the product can be
switched on or off or both automatically. Do you think that an audio
amplifier that utilises an
It is a regular thing that chambers get to be dismantled and reassembled
all the time. IMHO, it is possible to maintain SE of 100 dB for a
relocated chamber. The guys who sell you the brand new chamber always
assemble and test the complete chamber in their factory before shipment.
The
John
Obviously loudspeakers could be affected by external magnetic fields - and
thus should be tested using the procedure described in EN 61000-4-8
(immunity to power frequency magnetic fields). Thus CE marking against the
EMC Directive is appropriate. In addition, in some instances the drive
I read in !emc-pstc that soundsu...@aol.com wrote (in de.2d3ec19c.2ab92
9...@aol.com) about 'CE Marking for Passive speakers' on Tue, 17 Sep
2002:
John,
You wrote, with regard to passive speakers and headphones:
The absence of active components is irrelevant. The EMC and Low Voltage
Directives
Thank you for posting what I excerpted below. At the risk of this thread
flaring up again, I have to state that just because a cable assembly or loom
does not have an over-braid shield or screen does not qualify it as being
unshielded or unscreened. The ONLY excuse for an over-braid is
John,
You wrote, with regard to passive speakers and headphones:
The absence of active components is irrelevant. The EMC and Low Voltage
Directives apply.
How is it that the Directives apply to products that do not carry an
electrical rating?
And in response to the question of getting a
I read in !emc-pstc that Gert Gremmen g.grem...@cetest.nl wrote (in
oleokfnbajjejfkplbbmgeggcdaa.g.grem...@cetest.nl) about 'CE Marking
for Passive speakers' on Tue, 17 Sep 2002:
Officially this type of apparatus does not qualify
for ce marking due to the reasons you gave.
That is simply not
Brian,
I use a Hot Spot welder from DCC Corp. Works quite well and even comes
with green tinted safety glasses (as suggested by an earlier poster). Here
is a link to a description of it, I think they give company contact info as
well:
http://www.thomasregister.com/olc/dcc/hot2.htm
Dan
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