Nice work on this John, very helpful.
I just got a notice from the IEC on their new EMC Zone at:
http://www.iec.ch/zone/emc/emc_entry.htm
It's not as detailed as John's information, but there are some useful items
of interest.
Best regards,
Dave
-Original Message-
From: John Barnes
Hello all,
I'm confused. When preparing an EMC test plan for CE
requirements I've been told to narrow in on Generic or
Product Standards (which ever is more applicable) to
help demonstrate compliance. For example, if testing
to EN 55024 ITE immunity, the standard calls for
various IEC Basic
Hi Rich,
I have had no personal contact with this person but
he often has articles in ECM (Electrical construction and
maintenance) detailing forensic analysis of electrical accidents.
He may be able to help you.
Alexander Kusko, Sc.D, P.E.
Exponent Failure Analysis Associates
Natick, Mass.
Hello KC,
I cannot comment on the Japanese standard; I can comment on the FCC
regulations. The FCC does allow 40 dB/decade below 30 MHz; they also allow
a different roll-off established by measuring at 2 points along a radial.
The resultant may be different than 40 dB/decade, depending on the
Standards aside, one other practical point to consider (all countries), the
+/- 10% (or whatever) that may be quoted by (or required of) the utility
company applies only to the point at which they deliver to their customer.
There will then be an additional volt-drop within the customer's
Agree, that's why my post was phrased to use the car as an energy collector,
while static in the car park eight hours per day, and not to suggest using
solar electric power as a substitute for gasoline.
We have invested 100 years engineering development into the four stroke IC
engine and now
Just to keep things up to date MIL-STD-105 is cancelled. MIL-STD-1916 not
takes its place.
-doug
---
Douglas E. Powell, Compliance Engineer
Advanced Energy Industries, Inc.
Ft. Collins, CO 80525
mailto:doug.pow...@aei.com
---
-Original Message-
From: Chris Maxwell
Check out High-Speed Digital Design by Howard Hohnson and Martin Graham.
Rhents rule deals with this topic.
Dave Clement
Motorola Inc.
Global Homologation Engineering
20 Cabot Blvd.
Mansfield, MA 02048
P:508-851-8259
F:508-851-8512
C:508-725-9689
mailto:dave.clem...@motorola.com
John,
This is very nice, it's big job keeping up cuurent information. Do you
intend to keep it going long term?
-doug
---
Douglas E. Powell, Compliance Engineer
Advanced Energy Industries, Inc.
Ft. Collins, CO 80525
mailto:doug.pow...@aei.com
---
-Original Message-
I have a problem where a very large number of chips are mounted on a very
small board. The ground plane looks like Swiss cheese and there is ground
bounce accordingly. For future reference, is there a rule-of-thumb for how
much PCB area should be allocated per number of IC chips/pins so as to
Hello KC,
The attached message leads you a web site that discusses the 20 versus 40
dB/decade problem. ANSI/NIST may/should be doing a study.
Regards,
Ken Hall
-Original Message-
From: KC CHAN [PDD] [mailto:kcc...@hkpc.org]
Sent: Thursday, June 06, 2002 7:36 PM
To:
My physics is rusty but how many horsepower per Watt? A family car isn't
going to run on a horsepower value in the single digits. That solar-powered
race they run or used to run in Australia - those are pretty light-weight
race cars. And the Australian Outback when they run/ran that race was
No one seems to be answering this, so I will take a stab at it. But this is
only technical aspects, not a policy response. At 13 MHz (11.5 m tuned
dipole) a real measurement antenna (one which draws power from the Poynting
vector impinging upon it) will not be measuring in the far field.
I would add that if your power source puts out milliwatts and has a high
source impedance such that attempting to draw more than design current
causes foldback or just plain loading then even if there is a high voltage
section it will be even more current limited and is therefore not in the
same
sorry, off topic, mostly for US residents:
just imagine everyone's car being coated with 'solar cell generator' material
with a storage device in the trunk..
and how about air-conditioners that run on the Stirling cycle from a solar
energy collector...
lousy for the oil lobby but
2c
it seems that the low voltage used in the application is being mistaken for low
energy. Your garden variety alkaline manganese cell has such a low internal
resistance that it behaves as a little bomb when shorted. Same with lithium
battery technology. If the solar cell can put out 10W it
Don
Theoretical solar-cell efficiency calculation excludes photons of
insufficient energy for electron-hole-pair production. Also photon energy
beyond pair-production requiement is converted to heat (and cannot produce
electricity). Electron-hole pairs produced in doped regions above or below
If it's close to Texas try Unified Investigation as a forensic lab:
Unified Investigations
223 East Greenbrier Lane
Dallas TX 75203
214 946-8989
They were both knowledgeable and very professional
For a electrical fire investigation consultant for that area try Phil Wagner I
was also impressed
The only one I have seen is a house with an arrow pointing in that desigates
it's for indoor use.
Dave Clement
Motorola Inc.
Global Homologation Engineering
20 Cabot Blvd.
Mansfield, MA 02048
P:508-851-8259
F:508-851-8512
C:508-725-9689
mailto:dave.clem...@motorola.com
Hi All;
Does any know the purpose of a safety symbol depicting a house with a small
window on the right side? I will be grateful if someone can provide
information such as its use, safety standard, and exactly what the correct
symbol should look like.
Best regards,
Des Fraser
As pointed out by some colleagues. MIL-STD-105D is an incorrect reference. I
apoligize for any inconvenience. I double-checked our standards listing in
document control (which I should have done in the first place) and came up with
MIL-STD-889. This is a standard dealing with dissimilar
Dear Group,
What is the dielectric withstand test voltages for reed relays rated at 150
Vdc per the requirements of EN 60255, EN 60947 and EN 60950? Are there any
other standards that a reed relay can be used for agency approvals?
Your comments would be appreciated.
Best Regards,
Paul J
If I remember correctly, solar intensity in space is about 1.5 kW per square
meter. At sea level at the equator it something like 1.1 kW per square meter on
a clear day. So there is significant significant loss coming through the
atmosphere, but certainly not 90%. Perhaps there is 90% reduction
I thought the Suns Solar Intensity was 1kW per square meter above the
Earths atmosphere and what hit the ground was reduced by 90%. But it has
been a few years since my college days :-)
Andrew Carson - Senior Compliance Engineer, Xyratex, UK
Phone: +44 (0)23 9249 6855 Fax: +44 (0)23 9249 6014
On the surface, it seems to me that that requiring any sort of
regulatory compliance for a device operating from a 3 Volt source would
be utterly absurd. But then, from my perspective, regulatory agencies
are not always noted for their use of common sense in creating their
regulations. The fact
I am seeking a forensic lab that can analyze the probable cause of a fire in
electrical equipment. The lab must be located in the USA and preferably
located in the East or Central part of the country. Any referrals would be
appreciated.
Richard Woods
Manager Compliance Engineering
Sensormatic
I am seeking a consultant who can advise us on national spectrum allocation
and power limits in various countries for a particular type of short range
device. The major Pacific rim countries are of particular interest. I would
appreciate any referrals the group may offer.
Richard Woods
Manager
Brian -
The MW represents an NEMA/ANSI magnet wire type. As I'm
sure you're aware, there are a number of constructional
variations for magnet wire coatings with regard to costing
materials and thickness. Those meeting some minimum
specifications associated with an MW type will advertise the
Duncan,
From the Galvanic Compatibility Chart in the back of Instrument Specialties
(Now called Laird Technoligies) catalog.
Tin plating has an anodic index of 0.6V
Copper itself has an anodic index of 0.35V
For tin plated copper; I would use 0.6V.
Galvanized Steel (either hot dip or
For the power limit part of the problem, a good rule of thumb to use for solar
intensity is 1 kW per square meter. A garden variety solar cell (single crystal)
is easily 10% efficiency these days, and the best ones are past 20%, so this
yields 100 watts to beyond 200 watts per square meter for
Group,
Has anyone ever used a combination of metals not listed in annex J of
EN60950 for a protective earthing connection? If so can anyone suggest a decent
source of information on electrochemical potentials for various materials.
The particular materials in question are tin plated copper
Ron
Some help, I hope, to your questions.
Would this small LCD display device even be required to be evaluated to
IEC 60950 3rd Edition or to IEC 60950-1?
This depends on what you are trying to achieve, good company practices,
or a countries regulatory requirements.
For Europe, the product
To all
I just came across a Japanese standard about a RFID product at 13.5 MHZ, it
says that measurement of FCC from 30m to 3m will need to take the 20dB
conversion(ie 20dB/decade) into account.
But I found a statement from FCC part 15.31(f)(2) that at frequency below 30
MHZ, 40/decade
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