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 caps. Caps fail open, rig
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
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
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
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.
-
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
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 scott...@gmail.com wrote:
Thanks! Did you
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 kevinrobinso...@gmail.com
wrote:
Brian,
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, 2014 at 7:47 AM, dward dw
products
for best performance.'
Pat Lawler
plawl...@gmail.com
On Thu, Sep 4, 2014 at 9:31 AM, Gary McInturff gary.mcintu...@esterline.com
wrote:
Playing the devil advocate here only because I find this interesting and
I'm not advocating anything. Heck I'm probably just arguing for argument
sake
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
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
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
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
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'
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
%2bpnowyekmxxuzt4zmcs...@mail.gmail.com,
dated Sun, 27 Oct 2013, Pat Lawler plawl...@gmail.com writes:
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
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
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
traditional
methods.
* *
snip
* *
*Ed Price*
*WB6WSN*
*Chula Vista, CA USA*
** **
*From:* Pat Lawler [mailto:pat.law...@verizon.net pat.law...@verizon.net]
*Sent:* Sunday, April 28, 2013 7:38 AM
*To:* EMC-PSTC@LISTSERV.IEEE.ORG
*Subject:* [PSES] Mode-stirred, Mode-tuned, Reverb
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-mail to
emc
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
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 Society emc-pstc
discussion list
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
james.paw...@echostar.com wrote:
Hello,
I can't find
transmitters and potential non-linear
junctions!
http://www.incompliancemag.com/index.php?option=com_contentview=articleid=1149:eu-sets-emc-limits-for-london-olympicscatid=1:latest-newsItemid=19
http://ec.europa.eu/enterprise/sectors/electrical/files/emc/london-olympics-regul-2012_en.pdf
Pat Lawler
EMC
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
]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 like a whole new industry -- the business of testing
aircraft for immunity to personal electronic devices:
http
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
charles.gra...@echostar.com wrote:
Isn't the requirement in the scope?
EN 61000-3-2 applies to all electrical and electronic equipment that has
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
On Tue, 15 Jul 2003 08:09:16 -0400, Chris Maxwell
chris.maxw...@nettest.com 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
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.
a section describing transients found in the
United States.
Pat Lawler pat.law...@verizon.net
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/pstc/
To cancel your subscription, send
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 pat.law...@verizon.nett
(change nett to net to reply)
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion
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
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, georg...@trpo3.tr.unisys.com 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
' 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
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
input connector, would they disassemble it to access the portions inside?
Pat Lawler
plaw...@west.net
'
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
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 alfre...@netvigator.com 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,
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
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