All:
In pursuing Australian approvals for ITE, I am getting requests for TS 001
reports
for the system power supplies. These PSUs are embedded in the host ITE system
(i.e., they are a component of that system), and the PSUs have CB Scheme reports
that include the Australian variations. The
My company uses a 2 mw laser to align a reverse screen projector system. It
is my understanding that this low power laser falls under the
classification of Category 1 and is by definition, relatively safe. I
thought I would purchase a copy of EN 60825 to ensure that we have address
proper
The metric table that Anton provided seems to say that trade size ½ inch
is the same as 16 mm. However, the OD of trade size ½ inch is 20.7 mm, but
EN 60950 says the OD of 16 mm conduit is 16 mm. Obviously, something does
not compute. I hope its not me.
-
This message is coming from the
No, it is not about the rock group. It is about the doors of GR-1089-CORE.
Over the last couple of days I have enjoyed observing multiple opinions and
supporting evidence of the proper limit to apply to a product that has no
cabinet doors (Table 3-1 Vs Table 3-2). It is clear that at
is this what your looking for?
Anton (Tony) J. Nikolassy
Project Engineer, Electrical Section
Factory Mutual Research Corp.
Ph: 781-255-4819
Fx: 781-762-9375
e-mail: anton.nikola...@factory-mutual.com
-Original Message-
From: WOODS, RICHARD
Members,
We're looking for a test lab capable to measure radiated emission
according to MIL-STD-461C up to 60GHz (yes, 60GHz)?
Any suggestion ?
Amund
a...@dnv.com
-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to
Israel,
There are only three temperatures to worry about: Hot, Damn Hot and
Ouch. For something approaching a definition look in BS 4086
Recommendations for Maximum Surface Temperatures of Heated Domestic
Equipment. The other excellent standard for defining the issue is EN
563:1994 Safety of
Robert,
I see your point (as it relates to a typcial 'consumer' item like a TV) ),
but I also agree with Richard's interpretation (as it relates to ITE
equipment a la UL 1950, EN60950).
There are 'consumer' ITE equipment and one would expect to get a plug. But
also take into consideration that
-Original Message-
From: Muriel Bittencourt de Liz [SMTP:mur...@grucad.ufsc.br]
Sent: Thursday, October 07, 1999 5:43 AM
To: Lista de EMC da IEEE
Subject: broadband narrowband emissions
Group,
I'd like to have a clear definition of what are narrowband and broadband
Greetings:
Several years ago I ran some tests on welded, soldered and twisted
thermocouples, ten of each type. Immersed in the same liquid. As sensor I
used a Fluke, two decimal places.
There was no difference between welded and soldered units. The deviation of the
twisted thermocouples was less
Richard:
If I am not mistaken, IEC 950 refers to IEC 390. Furthermore, attachment caps
and appliance inlets you should be abl;e to find in IEC 320.
IMHO, you make your life unnecessirily hard on yourself if you try to interpret
standards.
Bogdan.
WOODS, RICHARD wrote:
I can find nothing in IEC
I have a copy of a standard EN 563:1994, Safety of machinery - Temperatures of
touchable surfaces - Ergonomics data to establish temperature limit values for
hot surfaces. It is only 18 pages but includes charts and graphs of burn
threshold vs contact time for plastic, metal, and ceramic
Derek:
For test jigging, I always go with an air core if possible.
100 uH is #10 wire wound on a 6 diameter helix, 6 long, with about 32
turns. For a coil form, try an oatmeal can or a piece of PVC drain pipe.
(That'll impress the customers!)
My next choice would be a powdered iron toroid,
We have used the design you are proposing, removable modules buried inside
with a front door requiring a tool to open. We also include the general
service warning advising of hazardous voltages, etc. We have our medical
equipment UL Classified to UL 2601 (based on en60601-1)and had no problem
One possible answer re the hot air issue:
Whatever the surface is (metal grill, plastic vent slots, etc.) that the
hot air is exiting the equipment from, will have to comply with the
external temperature limits already cited. If the air itself is so hot
that there is a burn hazard, those
Paul,
If you are asking wheather an enclosure with a keylock would be acceptable
means to prevent access, I would think yes. Why not? Anyone could carry a
screwdriver or a set of hex wrenches around on a keychain. I would think that
a key would be a more controlled means of securing access
Thanks Richard - you're right. The North American requirements are made
abundantly clear, both in overseeing doc's like the NEC and CEC and in
various standards (esp. CSA No. 0 which also covers the keep-out zone
required for the lock-nut).
It's the European picture that needs clarification, in
After reading Bill Lawrence's posting, I realized I made a typo error.
The last two numbers should have been 1 3/8 and 1 3/4.
The dimensions would then be:
7/80.875
1 1/8 1.125
1 3/8 1.375
1 ¾1.750
These are nominal values - the min and max values would be those which
Bill reported.
Here's a post from 1997...
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.
Mr. Fini,
I am unsure which of the following standards you need, however, here are the
standard that I located searching on fluorescent. My original search on
luminaires had no matches.
542
Lampholders, Starters, and Starter Holders for Fluorescent
Lamps, seventh
In my previous e-mail I had indicated that I had trouble getting a quote
from Schaffner for calibrating my ESD gun. Well, Schaffner has contacted
me, and was very responsive in taking care of my needs. They are
expediting the calibration of my equipment at no extra charge, and they
appear
Jim,
Thank you very much for the information. Do you have a recommendation on
the Omron types?
Regards,
Jerry
On Wed, 6 Oct 1999 08:23:55 -0500 JIM WIESE jim.wi...@adtran.com
writes:
You can order programmable relay controllers from Newark or Allied
electronics. Omron makes some good ones
Folks, all of the information on NEMA sizes is moot since the original
question was regarding metric sizes - 16 mm in particular - used in Europe
and most elsewhere in the world. Any information on holes for metric
fittings would be appreciated.
--
From: Bill Lawrence
You can also contact my company : Fiat Research Centre
We are a Competent Body under 89/336
And we have a Quality system ( en 45000-1) accredited from Sinal.
We also have experience in the field of EMC on medical devices.
Regard
Ing. Giuseppe Rossi , Narte Certified Engineer
Hello Israel,
I've not checked your numbers but believe the rationale is, in the case of
Item 1) below: that should one come into contact with a surface at these
temperatures, one will withdraw quickly and no damage is anticipated.
And, in the case of Item 2) below: should one come into contact
Some dimensions for typical sizes of knockouts:
Nominal Size of Conduit Knockout Diameter
1/2 0.859 / 0.906
3/4 1.094 / 1.141
1 1.359 / 1.406
1 1/4
Hello Paolo,
Without knowing the type of luminaire you are interested in, I offer the
following for your consideration.
In the USA, Portable Lamps = UL 153
In Canada, Portable Luminaires = CSA 22.2 No. 12
ALSO: A whole collection of standards which follow the IEC 598 series (as
denoted by
My company has a 12x12 sheilded enclosure that we would like assembled for
us. I prefer to have an experienced group install it so that we get the
most out of it from a shielding effectiveness point of view. Please let me
know if you have any leads on who would do this for me. We are located
Muriel,
Broadband Emission - An emission which has a bandwidth greater than the
device measuring it.
Narrowband Emission - An emission which has a bandwidth less than the
device measuring it.
These definitions are right out of IEC 50, International Electrotechnical
Vocabulary. The FCC
If you went to the store to buy a TV and one of the sets came without a plug on
the end of the cord, what would your thoughts be?
You can get away without plugs in some markets, but most customers expect a
functioning product, not a do it yourself project.
WOODS, RICHARD wrote:
I can find
Jim,
I took a few quick measurements of workboxes, isolation transformers, etc.
in the lab, as well as the knockout openings in the cast housings of some of
our flow transmitters.
7/8 and 1 1/8 seem to be the most common for the smaller circuits, with 2
3/8 and 2 3/4 used for the heavier stuff.
Group,
I'd like to have a clear definition of what are narrowband and broadband
emissions. This question may seem very plain for many members of
EMC-PSTC, but I always heard/saw this definition for emission and I
still couldn't make them clear to me..
Thanks in advance for your attention
Dear Group Fellows
I would like to raise the following two issues:
1) UL1950 / EN60950 Safety standards, Subclause 5.1 - Heating, Table
16 part 2, specify permissible temperature rise for external surfaces of
equipment in Operator Access Area..
For external surfaces,
Equipment designed to the requirements of EN60439-1 requires that any
removeable modules are only removeable with the use of a key or tool.
That seems pretty well acceptable to me as we are protectingainst unintentional
contact with potentially live parts.
What if the modules are not locked
Hi all,
We have some trouble , to find the UL and CSA equiv.alent standard of the
EN 60598-1 for general requirements and tests of LUMINAIRES and similar.
Do you can help me to fix the problem?
Best regards.
ing. Paolo Fini
Italponti
You can contact any of the following:
1. CESI Via Rubattino, 54 Milan - tel. ++39.0221251 - fax ++39.022125510
2. IMQ Via Quintiliano, 43 - Milano - tel ++39.0250731 -fax ++39.025073271
3. NEMKO-ALFLAB Via Trento e Trieste, 116/118 Biassono (Milan) - tel.
++39.039220120 - fax ++39.0392753240
Thanks for the details.
Just in case you accidentally permanently affect your monitor ( like I did
after playing with one of those really strong space magnets); use a cheap
electric pencil sharpener to degauss your screen's metal mask when the
power-on degausser isn't strong enough.
You're
I've got some toroids sitting on the bench (about 2 inches in diameter) that
would accomodate that with around 20 turns of doubled up 12 Awg wire.
You need them?
- Robert -
-Original Message-
From: Derek Walton l...@rols1.net
To:
Ken Eric:
I just measured two little sheet magnets using a Bell 4048 Gaussmeter (with
DC peak hold function) and a Bell T4048 Transverse (Hall) probe (which looks
like a little 0.05 square sensor chip on a stick).
The first magnetic is a 1 diameter by 0.04 thick disc. Using moderate
finger
Hi folks,
I need a low cost inductor with the following specifications:
100 microhenry, 30 amp max., operating frequency range 150 to 250 kHz
max.
The rest is open for grabs. An air-core, while cheap enough, is a little
large. So I'm thinking about a few turns of heavy wire on a bar. Any
Hi Jim:
Aren't there any permanently connected ITE equipment mfr's on this
forum?! What do you provide in the way of knockouts or ...???
I don't have any first-hand experience... but...
On good authority, a major mainframe manufacturer
uses cord-and-plug connection for EVERYTHING!
41 matches
Mail list logo
