> From: Griffith, Monty
> To: 'EMC POST'
> Subject: Q 4 salt caps.
> Date: Thursday, January 22, 1998 1:42 PM
>
> Hello group:
>
> We have a customer who insists the we have no capacitors with Quaternary
> Salts. I have been unable to find any publication that bans the use of
> this in IT equi
> From: Bob Blank
> Seeking source for shielded power cords to meet
> CE mark requirements.
> Prefer braided shield (80% tinned copper) instead
> of foil 18/3, CEE color coding, 10A, 125 V,
> PVC jacket, 9'10" long should have female
> connector PH-30 (angled IEC 320) molded on
> Should meet
A quick search on the web produced these websites:
http://www.ora.com/reference/dictionary/terms/M/MPR_II.htm
http://www.ora.com/reference/dictionary/terms/S/Swedish_Confederation_of_Pro
fessional_Employees.htm
Basically, it's a Swedish standard for limiting emissions
from VDTs or video disp
> From: Metse
>
> Your assistance if greatly appreciated (even if you can only answer some
of
> the questions):
>
> I have a general question concerning the applicable Directive for
equipment
> originally classified as ITE here in the US (by an International Lab with
NRTL
> accreditation).
>
>
Situation: Piece of equipment measures over
3.5 milli-amps for earth leakage test:
According to EN-60950
"5.2.5: Equipment with an earth leakage current
exceeding 3,5 mA
CLASS I STATIONARY that is PERMANENTLY CONNECTED
EQUIPMENT,
I've seen switchers cause noise envelopes and
picket fences well into the MHz range. The switching
freq is what (?) 100 kHz, 150 kHz ...
But, for some reason a pulse with a 20 nano-second period
makes me think that maybe a digital signal such as a square
wave is getting differentiated by the
> From: Arlen Olive
>
> I've been working on a multimedia board in a standalone box
> that connects to a PC parallel port. It also has an external
> DC power supply, and connections for audio and video
> input and output.
>
> To pass FCC class B, I had to:
> 1. Shield the box with a cond
Curiosity question because I've never dealt
with them before ...
What is registration warning in the front of
owners manuals for microwave ovens such as:
-
YOU MUST REGISTER YOUR MICROWAVE OVEN
The Federal Government requires that records be filed on the location of
all micr
holes through the ground plane.
But, they are not to be so large that the concerns of the
"sieve" design are violated, i.e. current crowding and
inductance are INCREASED.
Again, thanks for the reality check...
Doug ...
--
> From: Doug McKean
> To: IEEE Product Saf
I'm having a lively discussion with one of our
design engineers about backplane PCB design.
Here's the case:
1. Multilayer board, let's say 10 layers,
1 power plane (+5vdc), 3 ground planes,
6 signal planes.
2. Outside world connections to the
backplane with several connectors
Well, I've been reading the responses, and all I can
say is if you are dealing with a product that will
absolutely draw a constant rate of power for all time,
then you should see no variation *from the product*
unless of course you're in some varying unreliable
environment, or the product and
Hi Glenn,
Appreciate your response. but, I believe
you raised two separate and equally valid
points.
1. Insulation breakdown.
2. Some other safety hazard caused by heat.
Understand your primary concern well.
As far as the secondary point, the two of them
fought it out and one had
Hi Kevin,
I had a rather bad experience between UL and CSA in
the older days when there wasn't so much discussion
and agreement between them. I had set up an MOU
between them with UL as the test location.
Went like this ...
Switching power supply. Has a transformer.
Must do abnormals o
Is that what you're really seeing -
a harmonic of the clock?
I developed a spreadsheet whereby I can calculate
all sorts of freqs from a product that has been
accurate enough to scare me.
If you want, supply the freqs of all clocks,
incoming/outgoing signals, and any division
being do
Recently somewhere back in the news (couple of weeks ago),
two children died when one of them used a hairdryer in
the tub. A discussion this accident with some lead me
to a counter-intuitive result from my experience in
product safety.
**
Giv
> From: Cortland Richmond <72146@compuserve.com>
> To: "Grasso, Charles (Chaz)" ; ieee pstc
list
> Subject: RE: Antenna Calibration/Site Attenuation
> Date: Monday, August 25, 1997 11:19 AM
>
> If it's mutual coupling... sure. But if it's a surface wave, that's real
field
> strength. If the
Hi Eric,
Having been through this a while ago, I'll discuss what
I went through from memory. This information is now 2 years old.
The conductive coating is not a reliable ground. Primary ground
in the product on which I worked was on the switcher. Assembly
line testing hipotted with the
> From: Bill Lawrence
> And in the unusual posting department
>
> Can anyone offer any guidance on who may have jurisdiction over
electrical
> equipment installed / used in a sewer?
I hope with all the deregulation in the air,
we aren't suggesting sanitation engineers
fixing power line
I'm going to stick my neck out and say no.
Why? Because your product does not interface
in an optical manner in any way with the CD.
Anything that has to do with laser generation,
transmission, reception and use is completely
contained within the CD.
I believe one of the understandings with
Ummm Don't laugh, but for less than $5.00 you can get
"Understanding Telephone Electronics" from Radio Shack
if you have no experience and need to have some sort of a
start.
> From: Jon Bertrand
> I'm not quite on the correct list for this but -
>
> Do any of you know of
Hi Moshe,
You will have to be absolutely sure that the leakage problem
is NOT from any combination of the following "in sito".
That is to say "as it is installed in the product".
(1) the power supply
(2) the line filter
(3) the power and line filter combined
before you try anything. That
dlo...@advanced-input.com wrote:
>
> My company is looking to purchase some ESD Simulators. There are basically
> three manufacturers worldwide of this type eqiupment, and ESD guns are not
> cheap. I am interested in hearing of any experiences or information, good
> or bad, anyone has had with p
I personally have had a preference for
analog Spectrum analyzers for measurements.
I've always had trouble accepting sampling
rates, windowing, ... of the digital SA's.
I have used recievers only twice. But that's
just me. If I can measure the same field
strength with a digital SA or analog
In response to Mark's request, I'd like to just bring in
some general facts and personal observations concerning
RF fields and biological effects. And also stick my head
out with what I'm about to say.
RF radiation falls into basically three different categories
in relation to its effect on t
Just one comment...
I once submitted a product with interlock being monitored
by a microprocessor to UL. After they (UL) advised me that
testing all the various states that the microprocessor could
fail was going to be a rather expensive venture, I decided
that was a BAD thing to do. But, I t
Kurt Fischer wrote:
> Greetings! Thought the group might need a break from strings and cans!
> U.S. Department of Commerce News Release from the Office of the Secretary,
> Friday, June 13, 1997
> Washington-The United States and European Union have agreed to a package of
> mutual recognition a
Hi Arlen,
I don't know where I got the following chart, but
I believe it's from the The Shriners Burn Institute.
Someone else gave it to me. If anyone recognizes
this list, I would really like to know. I assume
I'm quoting someone, so I take absolutely no
credit for it.
TEMP
Robert Macy wrote:
>
> For measuring emissions per CISPR 22B what is the proper distance for
> the placement of the antenna?
>
> Is it 3m? or 10m?
>
> [I'm running across reputable labs that claim there is nothing wrong
> with measuring everything at 3m, just like FCC B.]
>
>
paul r. wrote:
>
> Is Telecom different from EMC?
> As far as I understand is it not allowed to self certify telecom
> equipment to the applicable standarts.
> Why?
> --
> Paul Rampelbergh
> Wezembeek-Oppem (Belgium)
> -
This is extremely abbreviated, but
here's my 2 1/2
Thank you Rolf,
So here's another question -
If a company from outside the US wants to use the
CB Scheme, who is the Body A within the US so that
they can go to a Body B in say India or China?
I am assuming the CB Scheme is valid for the
following products:
IEC 950,Information Te
Hi Rick,
I've been the same similar situation. I lost.
Your eletronegativities with the material you've
mentioned are ok. I lost to internal toothed
washers. The inspector wanted EXTERNAL toothed
washers. That insured seeing a toothed washer
during inspection. I managed to get by without
a
Specifically, what are Body One and Body Two
organizations in the CB scheme?
Ron Pickard wrote:
>
> Hi again,
>
> This time I have a question about EMC compliance in Mexico.
>
> I had heard that Mexico was establishing an EMC compliance program based
> on CISPR 22 back in 1995. Have they formalized it yet? And if so, what
> are the particulars (e.g., process, cost, time,
PHILLIP FORD wrote:
>
> Can anyone out there point me towards a list of legal requirements by
> country for the necessary languages to be used for
> > User manuals?
> > Service/installation instructions?
Having gone through this some time ago with a safety agency and
a corporate
dlo...@advanced-input.com wrote:
>
> One of our customers routinely does system ESD testing (to the IEC 1000 test
> level) on their production line. I have always considered ESD testing to be
> semi-destructive and would rather see "type" testing followed by strict
> control of the design. Produ
Mike Mertinooke wrote:
>
> Hi;
>
> Has anybody heard of such a thing as the "US Institute"???
> I am not sure "US" refers to "United States of America."
>
> Somebody in South Africa just whacked my boss with "we only
> buy products that satisfy the US Institute Protocols". Naturally,
> he "manag
hans_mellb...@non-hp-santaclara-om4.om.hp.com wrote:
>
> Item Subject: cc:Mail Text
>
> Thank you all who responded. I had failed to mention that this printed
> wiring spark-gap has a slot in between the sharp points (electric field
> enhancers to facilitate breakdown) and yes, the solder mask is
Grasso, Charles (Chaz) wrote:
>
> Hi - The information I have is this:
>
> Canada: ICES-003: 1994 Emissions No Immunity
Hi Charles,
"Whatever happened to" Canada C108.8 A, superceded?
Regards
--
Bob Blank wrote:
> Greetings,
> Need to hook up an HP 2225A Thinkjet Printer to an HP 8567 Spectrum
> Analyzer. Both are HP-IB.
> I remember doing it in the past, but don't remember how.
> I need the switch settings and the front panel print (not plot) command.
> Thanks,
> Bob Blank
I believe the
I'm looking for EMC software to be run on an IBM PC
compatible in Win 95 environment. I will be using the
requirements of this software to justify the machine on which
it's to be used.
The software is not to be used in an EMC lab, so implementation
with actual testing is not what's needed.
> Subject: Effective EMI coatings for steel, aluminum, plastic.
> Greetings to all viewers. I have been monitoring this forum for some time
> and would like to take this opportunity to ask a question concerning
> coatings
> or platings for steel, aluminum and plastic. Does anyone know of any
> s
Brent G DeWitt wrote:
>
> At 10:20 AM 20/03/97 -0500, Doug McKean wrote:
> >Martin Garwood wrote:
> >>
> >> Just received some propaganda from a consultant, this time promising to
> >> "have your lab provisionally accepted by the FCC in TWO WEEKS"
Martin Garwood wrote:
>
> Just received some propaganda from a consultant, this time promising to
> "have your lab provisionally accepted by the FCC in TWO WEEKS", to meet
> the requirements for DOC. I'd love to see a Quality &
> test procedure manual done in 2 weeks.
>
> Don't remember it being
moshe valdman wrote:
>
> Hello all,
>
> I'm interested in the SEMI S2-93 (requirements for safety,
> EMC, environment and other hazards for semiconductor
> manufacturing equipment).
>
> Can someone give some background on this? Is there some
> source of information on the Net? Is there a lab
Vi Van (MEPCD) wrote:
> Dear All,
> We are trying to find out the fastest way to get our PC approved for
> FCC. One way is self declaration by a NVLAP approved Laboratory. Does
> any EMC Labs in UK that are NVLAP approved?
> Thanks in Advance.
> Vi Van
> Mitsubishi PC.
The following sites are cu
Bob,
While I fully understand and concur with you concerning
ring *voltage*, that is not my point of concern in relation
with the LVD. Ring voltages are not passed through end-to-end
on T1 or E1. I have and do work on plenty of equipment that
only DCS's or IMUX's T1 or E1 and powered by 48vdc
Juan Pedro Peqa wrote:
> Doug:
> At least in Spain, public switching telephonic network
> works with 48 V dc but the ringing signal could reach
> 75 V ac (hazardous voltage according to LVD). In fact,
> if you catch both poles of a telephone line during the
> ringing process, you will suffer th
I'll throw in two cents worth.
We have been having a discussion concerning where standards
do and do not fit in to particular pieces of equipment.
I have had discussions in the past with people about
48VDC TTE products and the LV Directive - 73/23/EEC.
The LVD specifically states in Articl
To Jim -
As long as
1. Repair does not alter the construction and
performance of the product as documented.
2. Ownership does not change.
don't need.
To Richard -
I agree that *retention of ownership* is key here.
But, I would ask for a discussion following the
shift in own
donne...@agcs.com wrote:
> How about 15.103 (b):
> "A digital device used exclusively as an electronic control or
> power system utilized by a public utility or in an industrial plant.
> The term public utility includes equipment only to the extent that
> it is in a dedicated building or large ro
whis...@ccmailpc.ctron.com wrote:
>
>
> Keep in mind that the Phone Company has long been exempt from many
> regulations.
> This includes FCC Part 15 as well as the OSHA. The Phone Companies themselves
> require that all equipment to be used in the CO or customer Premise be listed
> with a NRTL
Bob Brister wrote:
> Hello,
> My interpretation of the criteria listed in 5.4.9 is if,
> under simulated fault conditions, a hole forms in the
> enclosure, that is not necessarily a failure of the product
> to remain safe. Would you agree?
That depends.
> The criteria seems to indicate that i
Eric Petitpierre wrote:
> Doug,
> Please elaborate regarding your statement "I eventually won in the
> end, but it was not easy. "
> I've run across this OSHA loophole as well and I am curious to find
> out what made it go your way.
> Was the telco equipment Customer
Patrick Lawler wrote:
>
> Recently, I asked a question concerning harmonic specifications and a
> system containing a 120W switching supply in parallel with an intermittant
> 450W resistive heater. I came up with two positions that support harmonic
> measurement while the resistive load is powered
Appreciate this point being raised.
When doing Safety testing for telco equipment,
I ran into this little gem from a VP when having
read the following, didn't want to hear anything else ...
"1910.302(a)(2) Not covered. The provisions of 1910.302
through 1910.308 of this subpart do not cover:
r_flind...@emulex.com wrote:
>
> Hello all,
>
> I am looking for a method to determine the minimum distance which I can
> route 1 GHz traces from other devices (including metal pin row headers)
> without compromising the EMC performance (characteristic impedance) of the
> traces, while preventing
richa...@exabyte.com wrote:
>
> Hello all,
>
> Does anyone know where and who sells laser measuring equipment.
> Specifically to measure the actual output of the lasers to meet the
> requirements set forth by IEC 825-1 and the FDA's 21 CFR 1040.10.
>
> Thanks in advance.
>
> Richard
Edward J. Eckert wrote:
> The talk is centered around safety because this is a safety
> discussion group.
> Answering to many threads recently, I must comment on your
> statement:
>> Safety specs are construction and performance.
>> They tell you what to do. No secret there."
> IMHO, with any
Juan Pedro Peña wrote:
> In this forum, I can see many question about EU regulatory law
> (EU Directives). For me, it is very clear and very easy.
> For example, for a simple Personal Computer, you have to comply
> with the LV Directive & EMC Directive. To do that, you can use
> the correspon
cortland.richmond...@ccmailsmtp.ast.com wrote:
< had to snip some stuff >
" the original question was whether courses in complying
with regulations should be offered in college."
This is a queston with many parts to it.
If it's just safety, then no.
If it's emi/emc, then maybe.
If it's ab
Why is the talk centered around safety?
Safety specs are construction and performance.
They tell you what to do. No secret there.
Emissions specs are performance specs. They say nothing
about construction. Only one course I've seen for emi/emc
offered at a school was a graduate class one sem
UMBDENSTOCK, DON wrote:
>
> Does anyone know if there are any formal restrictions to using red
> colored lights for front panel displays and indicators?
>
> Is there a harmonized European standard or regulation or a specific
> national regulation that requires the restriction of the color red fo
Trying to decode an e-mail from a former associate of mine.
---< START OF MESSAGE >---
"What is a CCITT requirement? What other requirements are to be met
for agency approval based on the information provided below?:
The Power Supply is required to either a 110 VAC or a 220 VAC
inpu
richa...@exabyte.com wrote:
>
> Hello all,
>
> Way back when, there was some discussion on laser products classifications.
>
> Right now, we are new to the use of lasers and their regulations. I have
> some basic knowledge of the regulations, due to long ago testing of them,
> and my g
Victor L. Boersma wrote:
> Doug,
> What you call "compliance engineering" I call
> "good design engineering". Basically, whether
> it is a regulatory requirement or not, there
> are certain things you have to do if you don't
> want your equipment to disturb other equipment.
I disagree. What I
To whom it may concern,
Sorry, I've been doing some hard drive cleaning
and I've erased the message that asked for
German Military emc standards.
This is not intended to be a spam, but since
this was the only informative response, I've
decided to post it. Again, I mean no spamming here.
grasso%stkww...@ccsvm.stortek.com wrote:
> We have a bid on sales to the German Army. However, they (the German Army)
> want to know if we meet low emissions to avoid data pick up.
> Does any one have any info on this?
> TIA
> Chaz
You will have to find out what the German equivalent
to TEMPEST
Paul Herrick wrote:
>
> -- [ From: Paul Herrick * EMC.Ver #2.3 ] --
>
> Does anyone have information on the use of Magnesium in ITE equipment. Under
> some circumstances the metal Magnesium can burn. IEC950 gives rules only for
> plastic parts.
>
> The actual application is for a casting to sa
Yes, the old question of interference from one home to
another.
I just had a friend (yes really, a friend) ask the
following:
He has a 100 Watt Shortwave radio transmitter/reciever
setup in his home (a condo). All approved equipment.
He operates in the 75m band (3.765 MHz). His antenna
i
maro...@aol.com wrote:
>
> On the same subject,
>
> Where do you put the AC mains fuse relative to the "X" capacitor used for the
> EMI filter?
>
> How does the "accross the line" safety rating of the capacitor affect this
> answer?
For my specific requirements, (I can't speak for anyone else)
mvald...@netvision.net.il wrote:
> Hello everyone,
> I would like your opinion (based both on your knowledge
> of the iso25/iso45001 and personal experience and view)
> on the "certification\testing lab anomaly".
> The issue is this: if one entity (let's call it the "LAB")
> offers both to cons
Jackson, William L wrote:
>
> Good Morning List,
>
> Does anyone know of any standards that provide guidance on where in-line
> fuses must be located in relation to the power switch; 1) before the
> switch, that is connected to the EMI filter or line, or 2) after the switch
> ( to the load side
X--X
richard.ma...@bailey.com wrote:
> I have seen equipment intended to plug into a U.S.A. wall
> receptacle marked as 115 V, 117 V, 118 V, and 120 V. CSA
> has published a standard C235 that states the nominal voltage
> rating for such a
e used GE Rental. They are not the only ones.
*******
Doug McKean
doug_mck...@paragon-networks.com
---
The comments and opinions stated herein are mine alone,
and do not reflect those of my employer.
---
***
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