pec, and simply copied it.
Pat Lawler
On Mon, Aug 13, 2018 at 7:53 PM Ken Javor wrote:
>
> Military procurement. They require 1000 volts hipot on this brush 28 Vdc
> motor. No electronics in motor. My bottom line is can I make a good case for
> not hipot testing the eeseal insert c
Charles,
I remember attending an amateur radio club meeting in the 1970s, and
someone brought their new Altair 8080 personal computer - a new device for
the tech savvy!
His demonstration involved placing an AM radio next to the computer, then
toggle-switch programming a long sequence into the com
Hi Charles,
One Sunday when my dad was young & attending church with his family, he
heard a ragged voice came over the church PA (public address) system saying
something to the effect of "Car 54, where are you?" Without breaking a
beat, the pastor said "That may be the voice of God, but I sincere
Hi Brian,
Can you ask your IT people to disable network access on the XP computer?
It would no longer be a risk to the company. Data transfer would have to
be via diskette or USB thumbdrive.
I've worked at other facilities with specialized engineering computers 'off
the network'.
Pat
On Dec 20
Hi Brian,
- Have there been changes to the design of your system, specifically
the AC EMI filter? Increased inductor values, either by design or
vendor change (filter manufacturer, or type of core used in the
filter) could cause excessive ringing at the input of the power supply
at turn-on.
- Try
Hi Monrad,
What about creating a DoC with a timeline for the Directive followed?
Something like:
"This device complies with the essential requirements of EMC Directive
2004/108/EC until 20 April 2016. After 20 April 2016, this device
complies with EMC Directive 2014/30/EU."
DoCs can be issued a
Scott,
I think the CENELEC standards start at 50xxx, and IEC standards start at
60xxx & 55xxx. That means CENELEC amendments to:
EN 50xxx standards start at A1
EN 60xxx & EN 55xxx standards start at A11.
Pat
On Mon, Feb 2, 2015 at 5:52 AM, Scott Xe wrote:
> Thanks! Did you mean CENELEC's amen
Although I'm not familiar with the issue, maybe OSHA should charge NRTLs
exorbitant fees for their label changes. This might relieve their
headache, and give the NRTLs a taste of their own medicine.
Pat
On Mon, Sep 29, 2014 at 1:14 PM, Kevin Robinson
wrote:
> Brian,
>
> I am responding from my
n't ship cables with the product. I'm reminded
of discussions on the listserver about selecting a brand of PC for
peripheral testing, or having a particular PC with all the screws tightened
and shielding contact surfaces polished clean.
Pat Lawler
plawl...@gmail.com
On Mon, Sep 8,
;Use only brand products
for best performance.'
Pat Lawler
plawl...@gmail.com
On Thu, Sep 4, 2014 at 9:31 AM, Gary McInturff wrote:
> Playing the devil advocate here only because I find this interesting and
> I'm not advocating anything. Heck I'm probably just arguing f
Hi Doug,
A starting point might be the FCC's Contract Test Firm listing at
https://apps.fcc.gov/oetcf/eas/reports/TestFirmSearch.cfm
It doesn't reflect lab quality approvals or reputation, but it gives you a
list of names to investigate.
Pat
On Fri, Aug 29, 2014 at 12:20 AM, Doug Powell wrote
Richard,
I once had an HP spectrum analyzer than had a dim screen after 10+
years of operation. Moving the display centering to use other parts
of the phospher didn't help.
I then removed the display glass and found a thin, even, layer of dust
on the CRT. Thank you, electrostatic precipitation.
Testing - Yes, it looked like they were testing it to death, leaving
only the good ones to ship. Obviously, there were enough good ones to
give RCA a good reputation. I almost expected quality engineers to be
present when the consumer unboxed the set.
Locations - I was surprised how many faciliti
> The Other Brian
>
>
> Sent via the Samsung GALAXY S®4, an AT&T 4G LTE smartphone
>
>
> Original message
> From: Pat Lawler
> Date:03/03/2014 1:21 PM (GMT-05:00)
> To: EMC-PSTC@LISTSERV.IEEE.ORG
> Subject: [PSES] Schaffer surge generator
>
All,
I need to calibrate our Schaffer NSG2050/PNW2055 surge generator. Two cal
houses have 'no bid', and I'm waiting for Teseq to reply.
Any suggestions for facilities in (or near) California?
Pat
-
This message is from the IEEE
- The customer could also view the situation as the standards body
performing due diligence, and making corrections to the standard when they
discover issues. Performing standards maintenance helps protect the
customer in case of user lawsuits.
- I wonder if there's an 'errors and omissions' claus
Oops -- that's what I get when trying to read EMC standards at 6:30am.
More coffee, please.
Pat
On Sun, Oct 27, 2013 at 6:58 AM, John Woodgate wrote:
> In message *gmail.com>,
> dated Sun, 27 Oct 2013, Pat Lawler writes:
>
> In reviewing ICES-003, Issue 5-2012, I
In reviewing ICES-003, Issue 5-2012, I noticed the Class B radiated limits
are sometimes higher than Class A limits by as much as 4.5dB!
http://www.ic.gc.ca/eic/site/smt-gst.nsf/vwapj/ICES-003-issue5-2012.pdf/$FILE/ICES-003-issue5-2012.pdf
Since the product classes have traditional definitions, I
All,
Do the EMC test standards require one of the AC input phases ('neutral' in
the U.S.) be grounded? If so, where can I find an example of this
requirement?
In the past, I had an experience where EMI test results with an AC supply
of 120Vac/0Vac (a source with a grounded neutral) were higher th
It looks like it was turned into a standard. I found this on the USB.org
web site:
http://www.usb.org/developers/devclass_docs/BCv1.2_070312.zip
I can see (more) confusion on the horizon for users -- "It works when I
charge it here but not there."
Pat
On Mon, May 27, 2013 at 10:52 AM, Doug Po
nhancing the reflections through the use of the moving mechanical
> structures) to achieve higher E-fields. This allows you to get higher
> E-fields for a test like RS103 than you could get using traditional
> methods.
>
> * *
>
>
>
> * *
>
> *Ed Price*
>
Which ones are used for which type of RF immunity test?
Thanks,
Pat Lawler
Teset engineer
-
This message is from the IEEE Product Safety Engineering Society emc-pstc
discussion list. To post a message to the list, send your e-ma
Cellphone sniffer hunts down illicit prison calls:
http://www.newscientist.com/article/mg21729085.700-cellphone-sniffer-hunts-down-illicit-prison-calls.html
This sounds interesting. I wonder if they could use it to find PEDs
on airplanes?
Pat Lawler
So, would having a DoC with a unique device ID imply the specific
device was tested to the standards listed - 100% production testing?
That would be cost prohibitive, not to mention degrading product
reliability in the case of line surge immunity testing.
Is there something in the recast that clar
x27;m surprised I hadn't heard about it until now.
Gives the kid's toy 'Mr. Potato Head' a whole new meaning!
Pat Lawler
Engineer
Century Electronics
-
This message is from the IEEE Product Safety Engineering So
CE marking allows a product to be imported/cross borders without barrier.
If something is assembled and sold inside the same EU country (the
product never crosses borders), who is responsible for CE enforcement?
Is it only complaint-based, or are there authorities who scan the
marketplace?
Pat
James,
Are you asking simply to clarify the test procedure, or because you
have a compliance problem?
If it's an issue of compliance, maybe you should give details for discussion.
Pat Lawler
On Mon, Aug 20, 2012 at 2:53 AM, Pawson, James
wrote:
>
> Hello,
>
> I can't fin
radio transmitters and potential non-linear
junctions!
<http://www.incompliancemag.com/index.php?option=com_content&view=article&id=1149:eu-sets-emc-limits-for-london-olympics&catid=1:latest-news&Itemid=19>
<http://ec.europa.eu/enterprise/sectors/electrical/files/emc/london-ol
Brian
>
> -----Original Message-
> From: emc-p...@ieee.org [mailto:emc-p...@ieee.org]On Behalf Of Pat
> Lawler
> Sent: Sunday, March 18, 2012 4:54 PM
> To: EMC-PSTC@LISTSERV.IEEE.ORG
> Subject: New immunity testing by the FAA in the future?
>
> Almost sounds
Almost sounds like a whole new industry -- the business of testing
aircraft for immunity to personal electronic devices:
http://bits.blogs.nytimes.com/2012/03/18/disruptions-time-to-review-f-a-a-policy-on-gadgets/
Pat Lawler
standard to remove any doubt that it applied.
That may have been the case with EN 61326.
Pat Lawler
On Wed, 21 Dec 2011 12:20:12 -0700, "Grasso, Charles"
wrote:
>Isn't the requirement in the scope?
>
>"EN 61000-3-2 applies to all electrical and electronic equipment t
We are designing a switching power supply for a customer that has
multiple outputs. Due to the tight regulation requirements, all
outputs have their own PWM modulators and control loops.
The customer feels the RF emissions (as measured by CISPR 11) will be
reduced by synchronizing the frequencie
On Tue, 15 Jul 2003 08:09:16 -0400, "Chris Maxwell"
wrote:
>It seems that I have been getting some odd requests from our customer support
people.
>
>We recently have been asked about compliance to "IP55" and an EMC standard
numbered "G.692".
>"IP55" sounds like an "ingress protection" level to me
On Thu, 10 Jul 2003 12:58:49 -0600, drcuthb...@micron.com wrote:
>I have a question on apertures. You may recall the formula that is frequently
given for signal attenuation through a small aperture in a large conductive
sheet. It is 20LOG(I/2L), where I is the wavelength and L is the slot length.
5n/50ns EFT, 10/1000us wave, 5kHz
ringawave), it also has a section describing transients found in the
United States.
Pat Lawler
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.
Visit our web site at: http://www.ewh.ieee.org/soc/emcs/p
#x27;HD', then
press the 'Run Report' button.
You might get expired documents in step 3) by also selecting an entry
in the 'Status' or 'Stage Code' field.
I'm not familiar with HD documents, so I don't know how to read the
results.
Pat Lawler
(change
Noise floor
(dB)(dBuV)
-- ---
0 27
10 35
20 45
30 55
40 65
50 75
Pat Lawler
plaw...@west.net
Are the German conducted EMI specifications VDE 871 and Vfg 243 still
enforced in Europe?
At one time, these were common requirements, but with CISPR11,
CISPR22, and the harmonization of standards, are they now obsolete?
Pat Lawler
plaw...@west.net
On Fri, 02 May 1997 16:52:30 +0800, Raymond Li
wrote:
>It says to comply with EMC requirements, ...
What standard are you referring to?
Pat Lawler
plaw...@west.net
a short circuit like a MOV could.
Discrete spark gaps may not fail short circuit, but they can certainly
act like one while in the arc mode. Holdover voltage on one 230V part
was 135V - that causes a lot of current to flow with a low impedance
source.
Pat Lawler
plaw...@west.net
duct still meet safety requirements?
I saw a product once that was double-insulated, and they removed the
ground pin from the _IEC320_receptacle_ (on the equipment). You could
use any power cord, regardless of whether it had a ground wire.
Very strange looking.
Pat Lawler
plaw...@west.net
On Wed, 16 Apr 97 11:15:00 EDT, wrote:
>Class E limits would be for equipment greater than 1000 watts.
Is there a typo? The magazine referenced applications <1000W.
Pat Lawler
plaw...@west.net
-2 Class A and
IEC555-2), 'sloping' limits (IEC1000-3-2 Class D), higher/lower limits
than Class A, etc.
This is even more significant to me than the proposed Class E!
Thanks,
Pat Lawler
plaw...@west.net
uot; would be covered by these new limits.
Does anyone know what 'professional equipment' is, and what the Class
E limits would be?
Pat Lawler
plaw...@west.net
I'm looking for EMC standards for Information Technology Equipment,
and I've found references to EN55024-x and EN55101-x.
Both of them have similar titles. What's the difference between the
two? Which one should I be following?
Pat Lawler
plaw...@west.net
he customer's product was
some variety of medical imaging equipment (I don't know if it's 'live'
imaging, film-to-disk scanning, or ???).
Therefore, the 'resistive heater' I mentioned in the beginning is actually a
high-power lamp. Considering the typical efficiency of an incandescant
lamp, it might as a well be a resistive heater. :)
Pat Lawler
was an 'integrated' piece of equipment, with a single AC
input connector, would they disassemble it to access the portions inside?
Pat Lawler
plaw...@west.net
I see postings concerning EMC meetings in other parts of the U.S. Are there
any similar meetings in southern California?
Pat Lawler
plaw...@west.net
I'm currently using IEC1000-3-2(1995-03) to determine my harmonic current
requirements.
Are there any significant technical changes in EN61000-3-2? I'd order the
EN version if it was more than a simple document number change on the cover.
At 06:16 PM 10/30/96 +0800, Alfred Lo wrote:
>May I tell you that harmonic standard is IEC1000-3-2, but not
>IEC1000-4-3, it is a radiated immunity standard.
My mistake: I _am_ asking about IEC1000-3-2.
I've also been looking at other IEC1000 standards lately (-3-3, -4-2, -4-5,
-4-11, -4-12). Th
I'm trying to determine what harmonic emission limits our 200W power
supplies need to comply with.
IEC1000-4-3 has a flow chart that selects the limits based on the
application. Since our products are used in ITE and ISM applications, I skip
through the flowchart sections dealing with three-phase
t. I saw the results of tests that one company did, and they
didn't use an 'official' AC source at all, but an arbitrary waveform
generator and a power amplifier.
Any recommendations?
Pat Lawler
plaw...@west.net
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