I suppose the only link between this listserver and the present topic
is that the chicken testing discussed pertains to some degree to
product safety.
One story made the rounds a few years ago about a railroad engine
manufacturer that wanted to perform some similar windshield tests on
it's
Dave,
Figure 13 is indeed the correct setup to use for cables with the shield
connected at both ends. In addition to the isolation transformers shown, the
ground connection on EUT 1 must be temporarily disconnected for this test.
For line cord connected 120V units I just use a cheater plug
Ron,
There was an old standard dealing with noise of computer and business
equipment. The Swedish Statskontoret Technical Standard 26:2 I do not have
the up to date version.
Rocky
-)-(-
Kenneth P. Gonzalez
Validation Manager
SCI Systems, Inc. Plant 1
Technology Division, Commercial
You raise a good point John. ESD testing to find hard failures (service call
required) does not require a statistical process. A few well placed high
voltage zaps can find that type of failure. However, recoverable (operator
intervention) or self-recoverable errors are by far the most likely
Hello Ron,
I know that UL 3101-1 and EN 61010-1 there are requiments for sound and
power pressure,
in UL 3101-1 --for sound pressure level of 85kBA above a reference sound
pressure of 20uPa as the limit.
Regards,
Jorge Sarellano
TUV Product Service
Have you visited TUV PS lately?
You can find it in Vol. 3 of The EMC Handbook published by Don White
Consultants, Germantown Maryland, (301) 948-0028 (verify that the area code
has not changed).
Richard Woods
-Original Message-
From: John Harrington [mailto:jharring...@ktlcanada.com]
Sent: Friday, September 28,
I read in !emc-pstc that Douglas C. Smith d...@emcesd.com wrote (in
200109281718.naa27...@swiftsure.cnchost.com) about 'ESD Immunity
Testing', on Fri, 28 Sep 2001:
Also, the waveform specification in IEC61000-4-2 is currently so poor that
commercial guns
having vastly different outputs can pass
Russia has limits for sound levels from ITE. MSanPiN 001-96, Interstate
sanitary rules and norms, provides these requirements. Check with your
friendly neighborhood GOST representative for further details.
Ghery Pettit
Intel
-Original Message-
From: wo...@sensormatic.com
Would somebody please be kind enough to point me in the direction of some
information on the shielding effectiveness of such metals as copper, aluminium
and steel.
Thank you
John Harrington
RF Group Manager
Nemko Canada
jharring...@nemkoca.com
Tel: +(1) 613 737 9680 ext 229
Fax: +(1) 613 737
There are various OSHA defined levels of noise, beyond which the
employer must provide ear protection, regular checkups, etc. with
increasing levels. However, the first level is about 85dBa or so, about
that for the oprtator of a gas powered lawnmower .
With one exception, I know of no
There is also the tragic story of the aircraft subcontractor that provided
an extra strong canopy for the cockpit without telling the manufacturer -
all went well until a pilot was forced to eject - with fatal consequences.
Product Safety is an exercise in looking for the worst that can
I think MIL-B-5087B will show that alodyne and iridite provide excellent
conductivity. I can send you a PDF version if you need it. It is a 1 MB
attachment.
--
From: Thomas Donnelly tdonne...@lucent.com
To: Joe Brigante joseph.g.briga...@boeing.com, emc-pstc
Ron, OSHA limits apply in the workplace in the US, but those limits are in
place to prevent hearing loss. I am unaware of any other regulatory
requirements in the US. I once asked an European safety agency if our ITE
had to comply with any sound standards in order to be certified and I was
told
Ron,
OSHA has limits; don't know if they apply to your question. See 29 CFR
1910.95
Regards,
Don Umbdenstock
Sensormatic
--
From: Ron Pickard[SMTP:rpick...@hypercom.com]
Reply To: Ron Pickard
Sent: Friday, September 28, 2001 2:47 PM
To: emc-p...@ieee.org
Hello Dave,
This is a basic standard. Does a product family standard exist that gives
any additional information?
We have products that fall under the scope of EN 50130-4 with similar
requirements. Although there is a slight difference in the method of
application, the requirements are
I have been following the discussion about ESD immunity. I want to say that
I'm very appreciative for the insights that the several posters have
presented regarding software error correction and the importance of zap
repetition rate.
Thanks for sharing your knowledge with us!
Ed Price
If a test is performed on a slowly cycling state machine, then increasing
the rate of discharge may not help. Knowing how many discharges it takes to
stop something is often as helpful as knowing how much energy it takes, and
if we apply fifty where one would have done, we have gained little by
Hi Brian:
I have, w/in previous 6 mos, attended seminars offered by (2) agencies. I
learned much from both, and appreciated being able to talk to the gurus.
But upon review of seminar notes and manuals from previous Product Safety
Engineers, it would seem that issued
To all,
I have been looking into sound pressure/power level requirements emanating from
equipment such as
ITE and any regulatory limits pertaining to them. Such requirements exist in
the NEBS environment
(section 4.6 of GR-63). There are other requirement relating to earpieces,
such as
Can anyone point me to a source of information on the electrical
conductivity of various chemical treatments used on aluminum? I need
information to determine the effect of various treatments if used on an
aluminum chassis will have on the shielding characteristics.
Thanks,
Tom Donnelly
EMC Test
Good People of PSTC:
I have, w/in previous 6 mos, attended seminars offered by (2) agencies. I
learned much from both, and appreciated being able to talk to the gurus.
But upon review of seminar notes and manuals from previous Product Safety
Engineers, it would seem that issued materials
I'm trying to get surge testing done on a DS3 interface against EN61000-4-5.
According to the standard, the test set-up in figure 13 should be used. The
figure shows the test generator connecting to the chassis - can someone
confirm that is how the test is done - i.e. the surge is applied to the
Hi Richard and the group,
There are lots of problems with existing standards that would take to long to
describe here. In
general, the limits of instrumention and time constraints I think are the main
reason for existing
shortcomings. IEC 61000-4-2 is being rewritten and the current draft
I read in !emc-pstc that wo...@sensormatic.com wrote (in 846BF526A205F8
4BA2B6045BBF7E9A6A43A3C9@flbocexu05) about 'ESD Immunity Testing', on
Fri, 28 Sep 2001:
So here is my question to those of you involved in the EN/IEC standards -
why have these statistical test processes not been
Richard,
Presently, the IEC 61000-4-2 standard is being revised. The main aim of the
revision is:
Improve the repeatability of test results !
This includes a discussion on the number of discharges. But increasing them
is meeting lots or resistance:
People simply do not want to increase
Rich,
Multiple zaps and step-stress techniques are ideal for evaluation and
characterization of new circuitry during the engineering phase of
development.
The proof of good engineering design is an ESD test at the system level to
the applicable ESD standard(s). The typical ten zaps may not
Richard: The only thing that I might add to your list is that digital
devices frequently (always?) have software or firmware driven error recovery
routines. The effect of a single zap can invoke these routines which must
be allowed to run to completion before another zap is applied or the test
Ah, the things we do to advance scientific knowledge. Some days I wonder.
M. Taylor
-Original Message-
From: Darren Pearson [mailto:dar...@genesysibs.com]
Sent: Friday, September 28, 2001 2:14 AM
To: k.macl...@aprel.com; Michael Taylor; geor...@lexmark.com;
emc-p...@ieee.org
Subject:
I agree with your sentiments below but they don't explain how using the IT
standard can make an audio product safer. Are you sure that the creepage
and clearance distances are more stringent in 950 than they are in 65?
Chris Colgan
Compliance Engineer
TAG McLaren Audio Ltd
The Summit, Latham
Since my last posting on trying to find an ESD expert, I have had to become
that expert. After reading the ANSI ESD standard and its references, it is
clear that ESD experts are mostly in agreement on how to correctly perform
ESD immunity testing. It is also clear test methods in the EN/IEC
RE: Steel Balls vs. ChickensWhen doing some EMC testing a few years ago at a
aerospace engine manufactures, on aircraft engines, I asked about the roomers
on frozen chickens. The reply was they test the engines by putting frozen
chickens and defrosted ones in to the air intake to see what
We are not far apart Rich,
However - I agree with the concept of teaching engineers to open their eyes
and seeing what is before them - that is how we make progress. I do not
believe that setting down even more rules will help the situation - it will
cause only opportunities to deviate from the
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