The sign at China Lake:
WHAT YOU
SEE HERE, SAY HERE, DO HERE,
STAYS HERE!
JOHN E. STUCKEY
EMC Engineer
NCT EMC 002047
This is a natural reaction - and even an 'Enforcement Officer' in the UK has
produced a book suggesting that you can do a safety review and apply the CE
Marking for safety using only ONE template (which happens to be his
book!!!).
Consider the number of PRODUCT standards written - these reflect t
Rich,
I agree with you with your statement "rather than address products, safety
standards need to address hazards". However, the "hazard" standards must be
made taking into consideration the environment in which the product is used
"light industry, heavy industry, medical, office, outdoor, hom
I like a material called 'Formex GK' polypropylene because is is not
hygroscopic like nomex and has acceptable flame rating. I dont know if they
offer it in clear.
Model GK-17BK comes in a 24 inch by 1000 foot roll and is 0.017" thick black
sheet. UL listed CCN: QMFZ2 file # E121855
Try: ITW Fast
A really "trick" cannon was used at China Lake-NWTC & Edwards-AFB to test
the impact resistance on All Weather Aircraft wind screens & canopy's.
Fresh Frozen chickens were defrosted the day before and "shot" out of a high
pressure tube at the subject wind screens & canopy's simulating bird impact
i
In the late 1960's I was working on what became IBM's first copier.
We made frequent use of "NESA" glass, a PPG product. This consisted
of an ultra-thin gold layer deposited on glass sheets. We could perform
photoconductor light-discharge experiments by coating the PC on the
gold surface, and
Hi Enci:
The materials you mention, NOMEX aramid paper and
phenolic are suitable materials for your application.
For your application, I suggest the material be rated
VTM-1 or better. VTM means Very Thin Material, and is
a UL designation for the material flame rating.
I also suggest the mat
I read in !emc-pstc that wo...@sensormatic.com wrote (in <846BF526A205F8
4BA2B6045BBF7E9A6A43A3B3@flbocexu05>) about 'Applying the appropriate
ENs', on Wed, 26 Sep 2001:
>Assume a product is primarily intended for a particular use (example: CCTV
>for surveillance use) and the appropriate ENs are a
I read in !emc-pstc that umbdenst...@sensormatic.com wrote (in
<846BF526A205F84BA2B6045BBF7E9A6A21967C@flbocexu05>) about 'Steel ball
for impact tests', on Wed, 26 Sep 2001:
>Searching for a new sport,
Check aircraft cockpit windows for resistance to bird strike by
projecting chicken carcasses at
> It is the primary end use of the product that dictates the standard(s)
> required.
Unfortunately, this archaic and provincial view on
the part of standards organizations that standards
should be per product has created problems that
most of us would like to avoid.
Consider product saf
Hi,
I am looking for source/names/information on thin electrical insulation
material - preferrably in the UK please.
I have a small metal housing, which needs additional insulation.
My first prototype used polyester tape, as used for transformer windings.
Tape is not an ideal solution due to t
It is the primary end use of the product that dictates the standard(s)
required.
If a product is sold as X, but then used by the user as Y, the
manufacturer/etc only has to apply X relevant standards. But if the product
is sold/marketed as Y, then Y standards must be applied. As a
manufacturer/
Don's message brings up a key consideration for any
type of test that is performed - repeatability.
If you can't repeat the results, you need to re-evaluate
your methodology. For instance, in the event you had a
failure, it would be difficult to determine if your fix
actually worked.
John Juh
Announcement-
Subject - EMF Personnel Safety Issues Relating to EMC Testing
Speaker - Dave Baron, Holaday Industries
The Speaker will address aspects of electromagnetic field (EMF) environments
relating to workplace safety. Topics will include the biological basis for
controlling human exposu
Good morning Terry,
I know of a testing and engineering service lab in Vancouver; Celltech, a
division of Globus Wireless. I do not know if they have all the capacities
you require because I dealt with them only on the radio certification side
of their business but you may contact them. Here are
Scott,
You had indicated that " A tube is nice but not needed if you can drop the
weight accurately. . ." I also used to test "bombs away", somewhat as a
sport to see how close I could come to the desired spot.
We had an interesting experienced that permanently changed our approach. We
had a d
Assume a product is primarily intended for a particular use (example: CCTV
for surveillance use) and the appropriate ENs are applied for that intended
use and a Declaration of Conformity is issued listing the applied standard.
Now assume that the product is marketed and sold for a secondary intend
Just don't let your ES&H people see you standing on a chair to perform this
test. <; )
"Scott Lacey" on 09/25/2001
05:38:44 PM
Please respond to "Scott Lacey"
To: emc-pstc%majordomo.ieee@interlock.lexmark.com
cc:(bcc: Oscar Overton/Lex/Lexmark)
Subject: RE: Steel ball for
I assisted in developing a tester for brain damage a long time ago. The
device created flicker at various rates and the rate was lowered until the
patient first noted the flicker. It seems that a person with brain damage is
able to notice flicker at a higher rate than a healthy person.
Richard Wo
John, I can't answer your question directly, but we did some research
into PSE just over a year ago, and were told the following by a
consultant pediatric neurologist at Sheffield children's hospital:
- Teenagers and adolescents are most susceptible.
- Small percentage of people susceptible,
I think we may be assuming this overload is caused by the EUT. But this is
just as likely to be caused by something else. Medium Wave and Long Wave
broadcasting produces powerful fields at some distance from an antenna.
This has a fix.
If you place a narrowly resonant loop antenna, with feed poin
Assuming that moving the antenna away from the source is not a palatable
solution, here is a more complex answer. The loop is electrostatically
shielded, which means there is a small air gap somewhere around the loop
shield, usually at the top or at the base. If you do a "poor" job of
jumpering
Hi,
I have some questions. What are the dimension of your loop? Are you
measuring a static field? If so, I suggest you use a Hall-effect type
sensor, I have had good results at powerline frequencies. If you are
measuring the H-field component for anything in the 30 MHz or so region, I
would
PLEASE NOTE THAT IT IS 500gms +- 25gms
Best regards
Gregg
-Original Message-
From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Scott Lacey
Sent: Tuesday, September 25, 2001 5:39 PM
To: emc-p...@majordomo.ieee.org
Subject: RE: Steel ba
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